Updated on 2025/10/01

写真a

 
IKEDA Naoshi
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • 博士(理学) ( 早稲田大学 )

Research Interests

  • 誘電体

  • ferroelectrics

  • 磁性体

  • electronic ferroelectricity

  • フラストレーション

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

  • Natural Science / Semiconductors, optical properties of condensed matter and atomic physics

  • Natural Science / Mathematical physics and fundamental theory of condensed matter physics  / 電子強誘電体

Research History

  • - Professor,Mathematics and Physics,Graduate School of Natural Science and Technology,Okayama University

    2006

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  • - 岡山大学自然科学研究科数理物理科学専攻 教授

    2006

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Papers

  • Ginzburg-Landau action and polarization current in an excitonic insulator model of electronic ferroelectricity

    Hiroto Adachi, Naoshi Ikeda, Eiji Saitoh

    Physical Review B   107 ( 15 )   2023.4

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevb.107.155142

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.107.155142/fulltext

  • Formation of Binderless Carbon Short Fibers Structure by Fiber Aerosol Deposition Reviewed

    M. Mori, S. Mori, M. Nishikawa, N. Ikeda

    Journal of the Japanese Society for Experimental Mechanics   22 ( 4 )   255 - 259   2023.1

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    DOI: 10.11395/jjsem.22.255

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  • Direct evidence of electronic ferroelectricity in YbFe<inf>2</inf>O<inf>4</inf> using neutron diffraction and nonlinear spectroscopy

    K. Fujiwara, Y. Fukada, Y. Okuda, R. Seimiya, N. Ikeda, K. Yokoyama, H. Yu, S. Koshihara, Y. Okimoto

    Scientific Reports   11 ( 1 )   2021.12

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    DOI: 10.1038/s41598-021-83655-6

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  • Present status of the experimental aspect of RFe2O4 study

    Naoshi Ikeda, Tomoko Nagata, Jun Kano, Shigeo Mori

    JOURNAL OF PHYSICS-CONDENSED MATTER   27 ( 5 )   2015.2

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  • Superconductivity in alkali-metal-doped picene

    Ryoji Mitsuhashi, Yuta Suzuki, Yusuke Yamanari, Hiroki Mitamura, Takashi Kambe, Naoshi Ikeda, Hideki Okamoto, Akihiko Fujiwara, Minoru Yamaji, Naoko Kawasaki, Yutaka Maniwa, Yoshihiro Kubozono

    NATURE   464 ( 7285 )   76 - 79   2010.3

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    DOI: 10.1038/nature08859

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  • An organic thyristor

    F Sawano, Terasaki, I, H Mori, T Mori, M Watanabe, N Ikeda, Y Nogami, Y Noda

    NATURE   437 ( 7058 )   522 - 524   2005.9

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    DOI: 10.1038/nature04087

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  • Ferroelectricity from iron valence ordering in the charge-frustrated system LuFe2O4

    Naoshi Ikeda, Hiroyuki Ohsumi, Kenji Ohwada, Kenji Ishii, Toshiya Inami, Kazuhisa Kakurai, Youichi Murakami, Kenji Yoshii, Shigeo Mori, Yoichi Horibe, Hijiri Kitô

    Nature   436 ( 7054 )   1136 - 1138   2005.8

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    DOI: 10.1038/nature04039

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  • Synthesis of Carbon Nanowalls using Plasma-Irradiated Solid Carbon and Absorption of Cs in Water

    Yukimasa Fukada, Yumito Aoyagi, Misaki Yokoyama, Yoichi Horibe, Jun Kano, Miyu Kaneda, Tatsuo Fujii, Akitaka Yoshigoe, Masaaki Kobata, Tatsuo Fukuda, Kenji Yoshii, Naoshi Ikeda

    Journal of Electronic Materials   54 ( 1 )   686 - 692   2024.11

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    DOI: 10.1007/s11664-024-11586-9

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    Other Link: https://link.springer.com/article/10.1007/s11664-024-11586-9/fulltext.html

  • Ultrafast anisotropic polarization dynamics of electronic ferroelectric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>LuFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

    H. Yu, Y. Fukada, G. Nishida, K. Takubo, T. Ishikawa, S. Koshihara, N. Ikeda, Y. Okimoto

    Physical Review Materials   8 ( 6 )   2024.6

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    DOI: 10.1103/physrevmaterials.8.064402

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevMaterials.8.064402/fulltext

  • Structural Characterization of Graphite Analogue BCx Synthesized Under Various Conditions and Its Application to Ti Intercalation

    Kazumasa Horigane, Masayuki Tadokoro, Ritsuko Eguchi, Hirofumi Ishii, Shinichi Nakamura, Takashi Kambe, Naoshi Ikeda, Hidenori Goto, Yoshihiro Kubozono, Jun Akimitsu

    Inorganic Chemistry   62 ( 48 )   19466 - 19473   2023.11

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    Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

    DOI: 10.1021/acs.inorgchem.3c02405

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  • Nonlinear Optical Properties in an Epitaxial YbFe2O4 Film Probed by Second Harmonic and Terahertz Generation Reviewed International journal

    Hongwu Yu, Yoichi Okimoto, Atsuya Morita, Shuhei Shimanuki, Kou Takubo, Tadahiko Ishikawa, Shin-ya Koshihara, Ryusei Minakami, Hirotake Itoh, Shinichiro Iwai, Naoshi Ikeda, Takumi Sakagami, Mayu Nozaki, Tatsuo Fujii

    Materials   16 ( 5 )   1989 - (1-11)   2023.2

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    DOI: 10.3390/ma16051989

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  • Valence control of charge and orbital frustrated system YbFe2O4 with electrochemical Li+ intercalation

    S. Murase, Y. Yoshikawa, K. Fujiwara, Y. Fukada, T. Teranishi, J. Kano, T. Fujii, Y. Inada, M. Katayama, K. Yoshii, T. Tsuji, D. Matsumura, N. Ikeda

    Journal of Physics and Chemistry of Solids   162   110468 - 110468   2022.3

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    Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.jpcs.2021.110468

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  • Observation of magnetoelectric effect of charge-ordered ferroelectric LuFe<inf>2</inf>O<inf>4</inf> by inverse capacitance analysis

    Yukimasa Fukada, Naoshi Ikeda

    Journal of the Physical Society of Japan   90 ( 11 )   2021.11

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.7566/JPSJ.90.113705

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  • Quantum Interference of Totally Reflected Mössbauer γ-Rays from a 57Fe Monolayer Embedded in a Thin Film

    Kosuke Fujiwara, Takaya Mitsui, Yumito Aoyagi, Yoshitaka Yoda, Naoshi Ikeda

    Journal of the Physical Society of Japan   90 ( 8 )   084705 - 084705   2021.8

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    DOI: 10.7566/jpsj.90.084705

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  • Single domain growth and charge ordering of epitaxial YbFe2O4 films

    Takumi Sakagami, Reika Ota, Jun Kano, Naoshi Ikeda, Tatsuo Fujii

    CRYSTENGCOMM   2021.8

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    DOI: 10.1039/d1ce00834j

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  • High valence states of Pd supported on ferroelectric BaTiO3 driven by electric polarization

    Tasuku Yoshida, Jun Kano, Masaichiro Mizumaki, Yusuke Tamenori, Kiyofumi Nitta, Kazuo Kato, Satoshi Hinokuma, Norihiro Oshime, Satoshi Hirose, Hitoshi Mikami, Naoshi Ikeda, Tatsuo Fujii, Yuta Nishina, Tomoko Okubo

    APPLIED PHYSICS LETTERS   119 ( 9 )   2021.8

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    DOI: 10.1063/5.0066289

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  • Light reflectance and photoelectron yield spectroscopy enable acceptor level measurement in p-type Ba1-xTiO3 semiconductor

    Saya Fujii, Jun Kano, Norihiro Oshime, Tohru Higuchi, Yuta Nishina, Tatsuo Fujii, Naoshi Ikeda, Hiromi Ota

    JOURNAL OF APPLIED PHYSICS   129 ( 8 )   2021.2

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    DOI: 10.1063/5.0033761

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  • Crystallographical and morphological changes in charge-ordering transition of RFe<inf>2</inf>O<inf>4</inf> (R: Y, Lu) investigated by transmission electron microscopy

    Y. Horibe, S. Mori, N. Ikeda, K. Yoshii, H. Maeno, Y. Murakami

    Ferroelectrics   584 ( 1 )   20 - 30   2021

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    DOI: 10.1080/00150193.2021.1984762

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  • Analysis of glass behavior of lu<inf>2</inf>fe<inf>3</inf>o<inf>7</inf> with distributed equivalent circuit model

    Yukimasa Fukada, Ryota Fukuyama, Kosuke Fujiwara, Kenji Yoshii, Kei Shigematsu, Masaki Azuma, Naoshi Ikeda

    Journal of the Physical Society of Japan   90 ( 2 )   2021

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.7566/JPSJ.90.024710

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  • Skewed electronic band structure induced by electric polarization in ferroelectric BaTiO3

    Norihiro Oshime, Jun Kano, Eiji Ikenaga, Shintaro Yasui, Yosuke Hamasaki, Sou Yasuhara, Satoshi Hinokuma, Naoshi Ikeda, Pierre-Eymeric Janolin, Jean-Michel Kiat, Mitsuru Itoh, Takayoshi Yokoya, Tatsuo Fujii, Akira Yasui, Hitoshi Osawa

    SCIENTIFIC REPORTS   10 ( 1 )   2020.7

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    DOI: 10.1038/s41598-020-67651-w

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  • Dielectric and magnetocaloric study of TmCrO<inf>3</inf>

    K. Yoshii, Naoshi Ikeda

    Journal of Alloys and Compounds   804   364 - 369   2019.10

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    DOI: 10.1016/j.jallcom.2019.06.359

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  • One-Minute Joule Annealing Enhances the Thermoelectric Properties of Carbon Nanotube Yarns via the Formation of Graphene at the Interface Reviewed

    Masaki Hada, Taisuke Hasegawa, Hirotaka Inoue, Makito Takagi, Kazuki Omoto, Daiki Chujo, Shogo Iemoto, Taihei Kuroda, Taiga Morimoto, Takuma Hayashi, Toru Iijima, Tomoharu Tokunaga, Naoshi Ikeda, Kazuhiro Fujimori, Chihiro Itoh, Takeshi Nishikawa, Yoshifumi Yamashita, Toshihiko Kiwa, Shin-ya Koshihara, Satoshi Maeda, Yasuhiko Hayashi

    ACS APPLIED ENERGY MATERIALS   2 ( 10 )   7700 - 7708   2019.10

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    DOI: 10.1021/acsaem.9b01736

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  • Stabilization of spin and charge ordering in stoichiometric YbFe<inf>2</inf>O<inf>4</inf>

    Kosuke Fujiwara, Tomoyuki Karasudani, Kazuhisa Kakurai, Wai Tung Lee, Kirrily C. Rule, Andrew J. Studer, Naoshi Ikeda

    Journal of the Physical Society of Japan   88 ( 4 )   2019

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    DOI: 10.7566/JPSJ.88.044701

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  • Molecular adsorption behavior on metal thin films supported on oxides

    Kano Jun, Oshime Norihiro, Hirose Satoshi, Ueda Takeji, Yasui Shintaro, Hamasaki Yosuke, Itoh Mitsuru, Mikami Hitoshi, Ikeda Naoshi, Fujii Tatsuo, Kashihara Kodai, Schneider Julien

    Meeting Abstracts of the Physical Society of Japan   74.2   2103 - 2103   2019

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.74.2.0_2103

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  • Modulation in charge ordering structure of ferroelectric YbFe<inf>2</inf>O<inf>4</inf> by magnetic ordering

    T. Nagata, N. Ikeda

    AIP Advances   8 ( 7 )   2018.7

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    DOI: 10.1063/1.5026921

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  • Growth and charge ordering of epitaxial YbFe2O4 films on sapphire using Fe3O4 buffer layer Reviewed

    Fujii Tatsuo, Numata Tomoya, Nakahata Hiroki, Nakanishi Makoto, Kano Jun, Ikeda Naoshi

    JAPANESE JOURNAL OF APPLIED PHYSICS   57 ( 1 )   2018.1

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.7567/JJAP.57.010305

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  • Development and application of Mobile type Nuclear Resonance Monochromator

    Fujiwara Kosuke, Mitsui Takaya, Sakurai Yoshiharu, Ikeda Naoshi

    Meeting Abstracts of the Physical Society of Japan   73.2   530 - 530   2018

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    Language:Japanese   Publishing type:Research paper (other academic)   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.73.2.0_530

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  • Crystal-Site-Selective Spectrum of Fe3BO6 by Synchrotron Mossbauer Diffraction with Pure Nuclear Bragg Scattering

    Shin Nakamura, Takaya Mitsui, Kosuke Fujiwara, Naoshi Ikeda, Masayuki Kurokuzu, Susumu Shimomura

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   86 ( 8 )   2327 - 2336   2017.8

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    DOI: 10.7566/JPSJ.86.084701

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  • Phase relations in the pseudobinary systems RAO(3)-R2Ti2O7 (R: rare earth element and Y, A: Fe, Ga, Al, Cr and Mn) and syntheses of new compounds R(A(1-x)Ti(x))O3+x/2 (2/3 &lt;= x &lt;= 3/4) at elevated temperatures in air

    Francisco Brown, Ivan Jacobo-Herrera, Victor Alvarez-Montano, Noboru Kimizuka, Keiji Kurashina, Yuichi Michiue, Yoji Matsuo, Shigeo Mori, Naoshi Ikeda, Felipe Medrano

    JOURNAL OF SOLID STATE CHEMISTRY   251   131 - 142   2017.7

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    DOI: 10.1016/j.jssc.2017.04.001

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  • Coherent X-ray diffraction for domain observation II Reviewed

    K. Ohwada, D. Shimizu, J. Mizuki, J. Mizuki, K. Fujiwara, T. Nagata, N. Ikeda, H. Ohwa, N. Yasuda, K. Namikawa

    Ferroelectrics   513 ( 1 )   16 - 21   2017.6

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    DOI: 10.1080/00150193.2017.1350058

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  • Stability of cluster glass state in nano order sized YbFe2O4 powders

    H. Kobayashi, K. Fujiwara, N. Kobayashi, T. Ogawa, M. Sakai, M. Tsujimoto, O. Seri, S. Mori, N. Ikeda

    JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS   103   103 - 108   2017.4

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    DOI: 10.1016/j.jpcs.2016.12.014

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  • Absence of a polar phase in perovskite chromite RCrO3 (R=La and Pr)

    Kenji Yoshii, Naoshi Ikeda, Yutaka Shimojo, Yoshinobu Ishii

    MATERIALS CHEMISTRY AND PHYSICS   190   96 - 101   2017.4

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    DOI: 10.1016/j.matchemphys.2016.12.074

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  • Crystal-Site-Selective Spectrum of Fe3O4 Obtained by Mossbauer Diffraction

    Shin Nakamura, Takaya Mitsui, Kosuke Fujiwara, Naoshi Ikeda, Masayuki Kurokuzu, Susumu Shimomura

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   86 ( 2 )   400 - 409   2017.2

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    DOI: 10.7566/JPSJ.86.023706

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  • Electric spontaneous polarization in YbFe2O4

    T. Nagata, P. -E. Janolin, M. Fukunaga, B. Roman, K. Fujiwara, H. Kimura, J. -M. Kiat, N. Ikeda

    APPLIED PHYSICS LETTERS   110 ( 5 )   2295 - 2306   2017.1

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    DOI: 10.1063/1.4974994

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  • Possible charge order structure of stoichiometric YbFe2O4

    Kosuke Fujiwara, Tomoyuki Karasudani, Mamoru Fukunaga, Hiroyuki Kobayashi, Jun Kano, Pierre-Eymeric Janolin, Jean-Michel Kiat, Yoshio Nogami, Ryusuke Kondo, Naoshi Ikeda

    FERROELECTRICS   512 ( 1 )   85 - 91   2017

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    DOI: 10.1080/00150193.2017.1349945

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  • Ferroelectric and magnetic properties for nano particles of multiferroic YbFe2O4

    Hiroyuki Kobayashi, Kosuke Fujiwara, Naoya Kobayashi, Tomoyuki Karasudani, Masahiro Sakai, Naoshi Ikeda, Shigeo Mori, Osami Seri

    FERROELECTRICS   512 ( 1 )   77 - 84   2017

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    DOI: 10.1080/00150193.2017.1349913

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  • Development of Mossbauer diffractometer by using nuclear resonant scattering at SPring-8 BL11XU

    Shin Nakamura, Takaya Mitsui, Kosuke Fujiwara, Naoshi Ikeda, Yasuhiro Kobayashi, Susumu Shimomura

    HYPERFINE INTERACTIONS   237   2016.11

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    DOI: 10.1007/s10751-016-1370-x

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  • Quantitative study of band structure in BaTiO3 particles with vacant ionic sites

    Norihiro Oshime, Jun Kano, Naoshi Ikeda, Takashi Teranishi, Tatsuo Fujii, Takeji Ueda, Tomoko Ohkubo

    JOURNAL OF APPLIED PHYSICS   120 ( 15 )   2016.10

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    DOI: 10.1063/1.4964803

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  • Structural, magnetic and optical properties of YbFe2O4 films deposited by spin coating

    Tatsuo Fujii, Naoya Okamura, Hideki Hashimoto, Makoto Nakanishi, Jun Kano, Naoshi Ikeda

    AIP ADVANCES   6 ( 8 )   2016.8

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    DOI: 10.1063/1.4961639

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  • Observation of momentum-resolved charge fluctuations proximate to the charge-order phase using resonant inelastic x-ray scattering

    M. Yoshida, K. Ishii, M. Naka, S. Ishihara, I. Jarrige, K. Ikeuchi, Y. Murakami, K. Kudo, Y. Koike, T. Nagata, Y. Fukada, N. Ikeda, J. Mizuki

    SCIENTIFIC REPORTS   6   2016.3

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    DOI: 10.1038/srep23611

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  • Observation of all-in type tetrahedral displacements in nonmagnetic pyrochlore niobates

    S. Torigoe, Y. Ishimoto, Y. Aoishi, H. Murakawa, D. Matsumura, K. Yoshii, Y. Yoneda, Y. Nishihata, K. Kodama, K. Tomiyasu, K. Ikeda, H. Nakao, Y. Nogami, N. Ikeda, T. Otomo, N. Hanasaki

    PHYSICAL REVIEW B   93 ( 8 )   2016.2

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    DOI: 10.1103/PhysRevB.93.085109

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  • 21aPS-115 Catalysis on Metal-ferroelectric Junction

    Jyuna T., Kano J., Ikeda N., Fujii T., Ohkubo T.

    Meeting Abstracts of the Physical Society of Japan   71   2708 - 2708   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2708

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  • 21aAF-3 Effect of ion vacant on band structure in BaTiO_3

    Oshime N., Kano J., Ikeda N., Teranishi T., Osaki K., Fujii T., Ueda T., Ohkubo T.

    Meeting Abstracts of the Physical Society of Japan   71   2691 - 2691   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2691

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  • 21aPS-116 Dielectric and magnetic property of Mn doped (YbFe_2O_4)_m(YbFeO_3)_n, m=1, n=1 single crystal

    Karasudani T., Fujiwara K., Fujii T., Todori K., Kobayashi H., Fukunaga M., Horibe Y., Kano J., Ikeda N.

    Meeting Abstracts of the Physical Society of Japan   71.1   2709   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_2709

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  • Control of Fermi Level by Variation of Charge Ordering State in Yb1-xTixFe2O4

    Nagata Tomoko, Okazaki Hiroyuki, Wakita Takanori, Fukura Tetsushi, Iwata Nobuyuki, Yamamoto Hiroshi, Yokoya Takayoshi, Ikeda Naoshi

    Transactions of the Materials Research Society of Japan   41 ( 3 )   269 - 271   2016

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    <p>Fermi level and valence state were investigated in RFe2O4 (R = Y, Dy, Ho, Er, Tm, Yb, Lu, Sc, or In), which shows magnetoelectric effect originating from charge and magnetic orders of Fe2+ and Fe3+. We succeeded in controlling the Fermi level of YbFe2O4 system by Ti4+ substitution for Yb3+. The variation in the ratio of Fe2+ to Fe3+ is suggested to the origin of the Fermi level variation. This report suggests the possibility of simple selection of conduction type in functional oxide.</p>

    DOI: 10.14723/tmrsj.41.269

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  • Iron vacancy effect on the magnetization of YbFe2O4

    Fujiwara K., Miyajima M., Fukunaga M., Kano J., Kobayashi H., Ikeda N.

    Transactions of the Materials Research Society of Japan   41 ( 1 )   139 - 142   2016

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    We report the effect of iron vacancies on the magnetic property of spin and charge ordered system YbFe2O4 single crystals. The excess amount of iron compensates for the evaporation of iron during crystal growth. We concluded that samples grown with the standard method contain iron vacancies of more than 10%. It is considered that increasing the iron in the starting material recovers the iron stoichiometry, and the proper magnetic property appears. With recovery of the chemical stoichiometry, the magnetic hysteresis loop changes from a double loop to a single loop, which indicates the development of spin coherence and the appearance of a large ferrimagnetic domain. The anomaly found in the thermomagnetization curve at approximately 150 K, the so-called TLT transition, disappears with better stoichiometry. This fact indicates that TLT is not a kind of phase transition but an effect of iron vacancy. Our discovery demonstrates that most of the crystals used in RFe2O4 research might contain many iron vacancies. The confused discussions on this material about the spin order model, the charge order model, and so on might reconsider such chemical stoichiometry, including iron vacancies.

    DOI: 10.14723/tmrsj.41.139

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  • Pressure dependence of far-infrared reflectance spectra in layered iron oxide LuFe2O4

    Go T., Okamura H., Oohata G., Nagata T., Moriwaki T., Ikemoto Y., Mori S., Ikeda N., Mizoguchi K.

    Transactions of the Materials Research Society of Japan   41 ( 1 )   109 - 112   2016

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    The far-infrared reflectance spectra of layered iron oxide LuFe2O4 have been investigated at external pressure up to 8 GPa. The observed phonon modes continuously shift to the higher energy side with increasing pressure below 6 GPa. However, it is found that the spectral profile of the phonon modes drastically changes around 6 GPa. From the analysis of the phonon modes using a Lorentz oscillator model, it is shown that the spectral changes correspond to a structural phase transition that occurs at 6 GPa.

    DOI: 10.14723/tmrsj.41.109

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  • Observation of flux-grown α-Fe2O3 single crystal at the morin transition by 57Fe synchrotron radiation mössbauer diffraction

    Takaya Mitsui, Shin Nakamura, Naoshi Ikeda, Kosuke Fujiwara, Ryo Masuda, Yasuhiro Kobayashi, Makoto Seto

    Journal of the Physical Society of Japan   85 ( 5 )   2016

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Physical Society of Japan  

    DOI: 10.7566/JPSJ.85.054705

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  • 21pCC-5 Site selective Mossbauer spectrum measured by nuclear resonant scattering-diffractometer II

    Nakamura S., Mitsui T., Fujiwara K., Ikeda N., Shimomura S.

    Meeting Abstracts of the Physical Society of Japan   71   1273 - 1273   2016

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    DOI: 10.11316/jpsgaiyo.71.1.0_1273

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  • Short-ranged ordered structures and dielectric properties in layere iron oxides

    Yoshimoto W., Fujiwara T., Ikeda N., Kawaguchi S., Kubota Y., Ishii Y., Mori S.

    Meeting Abstracts of the Physical Society of Japan   71.2   2549 - 2549   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_2549

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  • Elemental substitution effects in multiferroic {\it R}Fe$_{2}$O$_{4}$ ({\it R}: rare earths) Reviewed

    Yoshii Kenji, Funae Takeshi*, Mizumaki Masaichiro*, Ejiri Hiroki*, Ikeda Naoshi*, Saito Hiroyuki, Matsumura Daiju

    Physica Status Solidi (C)   12 ( 6 )   841 - 844   2015.6

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    We report the effects of elemental substitutions in multiferroic {\it R}Fe$_{2}$O$_{4}$ ($R$: Y, Ho-Lu, In). The substitution by nonmagnetic Ga$^{3+}$ at the Fe site, which has not been reported so far, shows a drastic decrease in the ferrimagnetic transition temperature ($T_{\rm N}$). This is plausibly owing to the suppression of magnetic interactions between Fe ions, based on our previous results of other substituted systems such as {\it R}FeCoO$_{4}$. Dielectric constants near room temperature were comparable to those of $R$Fe$_{2}$O$_{4}$. The suppression of dielectric loss in this system is suitable to application. The {\it R}-site substitution was also attempted by the large R$^{3+}$ ions such as Dy$^{3+}$. The solubility limit was up to about 10\% of {\it R} ions, as confirmed by XRD and EXAFS measurements. $T_{\rm N}$ was raised by 5-10 K for Dy$^{3+}$ substitution.

    DOI: 10.1002/pssc.201400250

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  • Valence-specific magnetization of the charge-ordered multiferroelectric LuFe2 O4 using soft x-ray magnetic circular dichroism under 30 T pulsed high magnetic fields

    Yasuo Narumi, Tetsuya Nakamura, Kota Saito, Takayuki Morioka, Yukimasa Fukada, Takashi Kambe, Naoshi Ikeda, Yoshinori Kotani, Toyohiko Kinoshita, Koichi Kindo, Hiroyuki Nojiri

    Physical Review B - Condensed Matter and Materials Physics   91 ( 1 )   2015.1

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    DOI: 10.1103/PhysRevB.91.014410

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  • Valence-specific magnetization of the charge-ordered multiferroelectric LuFe2O4 using soft x-ray magnetic circular dichroism under 30 T pulsed high magnetic fields

    Yasuo Narumi, Tetsuya Nakamura, Kota Saito, Takayuki Morioka, Yukimasa Fukada, Takashi Kambe, Naoshi Ikeda, Yoshinori Kotani, Toyohiko Kinoshita, Koichi Kindo, Hiroyuki Nojiri

    PHYSICAL REVIEW B   91 ( 1 )   2015.1

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    DOI: 10.1103/PhysRevB.91.014410

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  • 10 fs Dynamics of Photoinduced Magnetic Transition in Double-Layered Charge Ordering in LuFe2O4 Under Interlayer Excitation Reviewed

    Y. Sagae, K. Yamada, T. Ishikawa, K. Itoh, H. Itoh, T. Sasaki, T. Nagata, J. Kano, T. Kambe, S. Ishihara, N. Ikeda, S. Iwai

    Springer Proceedings in Physics 162 (Ultrafast Phenomena XIX)   252 - 256   2015.1

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    DOI: 10.1007/978-3-319-13242-6_61

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  • Mössbauer Spectroscopy of Novel Ferroelectric Materials

    Shin Nakamura, Jun Kano, Norihiro Oshime, Naoshi Ikeda, Yasuhiro Kobayashi, Shinji Kitao, Makoto Seto

    KURRI Progress Report 2014   78   2015

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  • Elemental substitution effects in multiferroic RFe2O4 (R: rare earths)

    Kenji Yoshii, Takashi Funae, Masaichiro Mizumaki, Hiroki Ejiri, Naoshi Ikeda, Hiroyuki Saitoh, Daiju Matsumura

    PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 12, NO 6   12 ( 6 )   841 - 844   2015

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    DOI: 10.1002/pssc.201400250

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  • 16aAD-4 Fe 3p-3d resonant photoemission study of mixed-valence compound YbFe_2O_4

    Fukura T., Wakita T., Takeda A., Terashima K., Fujiwara K., Ikeda N., Muraoka Y., Yokoya T.

    Meeting Abstracts of the Physical Society of Japan   70   2405 - 2405   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_2405

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  • 17aCH-1 Site selective Mossbauer spectrum measured by nuclear resonant scattering - diffractometer

    Nakamura S., Mitsui T., Ikeda N., Fujiwara K., Kobayashi Y.

    Meeting Abstracts of the Physical Society of Japan   70   865 - 865   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_865

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  • 18aAD-9 Mossbauer diffraction study using nuclear Bragg monochromator

    Mitsui T., Nakamura S., Ikeda N., Fujiwara K., Kobayashi Y.

    Meeting Abstracts of the Physical Society of Japan   70   2489 - 2489   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_2489

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  • 18aPS-73 Unusual valence change of metal nanoparticles on the ferroelectric BaTiO_3

    Meeting Abstracts of the Physical Society of Japan   70   2505 - 2505   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_2505

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  • Temperature and polarization dependence of Fe L-3-edge X-ray absorption spectra of LuFe2O4

    A. Agui, M. Mizumaki, T. Kuroda, M. Kawai, T. Nagata, N. Ikeda, T. Uozumi

    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA   197   13 - 16   2014.12

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    DOI: 10.1016/j.elspec.2014.08.008

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  • Current-Induced Enhancement of Magnetic Anisotropy in Spin-Charge-Coupled Multiferroic YbFe2O4

    Kenji Yoshii, Daiju Matsumura, Hiroyuki Saitoh, Takashi Kambe, Mamoru Fukunaga, Yuji Muraoka, Naoshi Ikeda, Shigeo Mori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 6 )   2014.6

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    DOI: 10.7566/JPSJ.83.063708

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  • Valence instability of iron oxide ultrafine particles on ferroelectrics studied by Mossbauer spectroscopy

    Jun Kano, Takumi Okamoto, Shin Nakamura, Akio Fuwa, Takafumi Otoyama, Yoshiaki Nakazaki, Hideki Hashimoto, Jun Takada, Norihiro Oshime, Miho Ito, Naoshi Ikeda

    JAPANESE JOURNAL OF APPLIED PHYSICS   53 ( 5 )   2014.5

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    DOI: 10.7567/JJAP.53.05FB24

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  • Specific Heat Study of Multiferroic LuFe2O4 Single Crystal

    N. Hasegawa, T. Mitsumura, M. Takesada, A. Onodera, J. Kano, N. Ikeda

    FERROELECTRICS   462 ( 1 )   145 - 150   2014.4

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    DOI: 10.1080/00150193.2014.890505

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  • Preparation and electronic properties YbFe2O4 thin films by polymerized complex method

    N. Okamura, T. Fujii, J. Takada, M. Nakanishi, J. Kano, N. Ikeda

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy   61   S327 - S329   2014

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    DOI: 10.2497/jjspm.61.S327

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  • Carrier mobility of iron oxide nanoparticles supported on ferroelectrics studied by Mossbauer spectroscopy

    T. Okamoto, J. Kano, S. Nakamura, A. Fuwa, T. Otoyama, Y. Nakazaki, H. Hashimoto, J. Takada, M. Ito, N. Ikeda

    HYPERFINE INTERACTIONS   219 ( 1-3 )   147 - 152   2013.4

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    DOI: 10.1007/s10751-012-0687-3

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  • Magnetoelectric Effect Driven by Magnetic Domain Modification in LuFe2O4

    Takashi Kambe, Yukimasa Fukada, Jun Kano, Tomoko Nagata, Hiroyuki Okazaki, Takayoshi Yokoya, Shuichi Wakimoto, Kazuhisa Kakurai, Naoshi Ikeda

    PHYSICAL REVIEW LETTERS   110 ( 11 )   117602   2013.3

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    DOI: 10.1103/PhysRevLett.110.117602

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  • Magnetic properties of single crystalline YbFe2O4

    K. Yoshii, M. Mizumaki, K. Matsumoto, S. Mori, N. Endo, H. Saitoh, D. Matsumura, T. Kambe, N. Ikeda

    XXIST INTERNATIONAL SYMPOSIUM ON THE JAHN-TELLER EFFECT 2012   428   012032   2013

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    DOI: 10.1088/1742-6596/428/1/012032

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  • Nonlinear Electric Conductivity of Charge Ordered System RFe2O4 (R = Lu, Yb)

    T. Nagata, Y. Fukada, M. Kawai, J. Kano, T. Kambe, E. Dudzik, R. Feyerherm, P. E. Janolin, J. M. Kiat, N. Ikeda

    FERROELECTRICS   442 ( 1 )   45 - 49   2013

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    DOI: 10.1080/00150193.2013.773874

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  • Magnetic properties of R2Fe3O7 (R=Yb and Lu)

    K. Yoshii, N. Ikeda, R. Fukuyama, T. Nagata, T. Kambe, Y. Yoneda, T. Fukuda, S. Mori

    Solid State Communications   173   34 - 37   2013

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    DOI: 10.1016/j.ssc.2013.08.030

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  • Exchange Bias in Multiferroic RFe2O4 (R = Y, Er, Tm, Yb, Lu, and In)

    Kenji Yoshii, Naoshi Ikeda, Yasuo Nishihata, Daisuke Maeda, Ryota Fukuyama, Tomoko Nagata, Jun Kano, Takashi Kambe, Yoichi Horibe, Shigeo Mori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 3 )   33704   2012.3

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    DOI: 10.1143/JPSJ.81.033704

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  • Ferroelectricity and Ferrimagnetism of Hexagonal YbFeO3 Thin Films

    Hayato Iida, Takuro Koizumi, Yoshiaki Uesu, Kay Kohn, Naoshi Ikeda, Shigeo Mori, Raphael Haumont, Pierre-Eumeric Janolin, Jean-Michel Kiat, Mamoru Fukunaga, Yukio Noda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 2 )   24719   2012.2

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  • Magnetic and dielectric study of Bi2CuO4

    K. Yoshii, T. Fukuda, H. Akahama, J. Kano, T. Kambe, N. Ikeda

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   471 ( 21-22 )   766 - 769   2011.11

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    DOI: 10.1016/j.physc.2011.05.049

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  • Collapsing processes of charge ordered structure in charge- and spin- frustrated ferrite YbFe$_{2}$O$_{4}$ Reviewed

    Matsumoto Keisuke*, Koyama Tsukasa*, Mori Shigeo*, Yoshii Kenji, Ikeda Naoshi*

    Journal of Physics; Conference Series   320   012085\_1 - 012085\_5   2011.9

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    In order to clarify the stability of charge ordered structure (CO) in charge- and spinfrustrated ferrite YbFe$_{2}$O$_{4}$, we have investigated changes of the CO structure by partial substitution of Mn$^{2+}$ for Fe$^{2+}$ in YbFe$_{2}$O$_{4}$ by a transmission electron microscope (TEM), incombination with conventional dielectric measurement. It is revealed that subtle substitution of Mn$^{2+}$ for Fe$^{2+}$ in YbFe$_{2}$O$_{4}$ destroyed drastically the CO structure with the wave vector of q=$<$1/3 1/3 1/2$>$ and, instead, induced polar clustering structure characterized by honeycomb shaped diffuse scatterings in the reciprocal space. The formation of polar clustering structure should be responsible for the characteristic dielectric dispersion.

    DOI: 10.1088/1742-6596/320/1/012085

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  • Electronic phase transition of the valence-fluctuating fulleride Eu2.75C60

    Yusuke Yamanari, Yuta Suzuki, Kumiko Imai, Eiji Shikoh, Akihiko Fujiwara, Naoko Kawasaki, Naoshi Ikeda, Yoshihiro Kubozono, Takashi Kambe

    PHYSICAL REVIEW B   83 ( 24 )   2011.6

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    DOI: 10.1103/PhysRevB.83.245103

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  • Multiferroic Character and Magnetic Phase of LuFe2O4

    Daisuke Ohishi, Hironori Hayakawa, Hiroshi Akahama, Naoshi Ikeda, Takashi Kambe, Yoji Matsuo, Noboru Kimizuka, Jun Kano, Kenji Yoshii

    FERROELECTRICS   415   51 - 56   2011

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    DOI: 10.1080/00150193.2011.577371

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  • Doping effect on charge ordered structure in Mn-doped YbFe2O4

    K. Matsumoto, T. Koyama, S. Mori, K. Yoshii, T. Kambe, N. Ikeda

    3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC3): ADVANCES IN ELECTRO CERAMICS   18   2011

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    DOI: 10.1088/1757-899X/18/9/092047

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  • Ultrafast melting of charge ordering in LuFe2O4 probed by terahertz spectroscopy

    H. Itoh, K. Itoh, K. Anjyo, H. Nakaya, H. Akahama, D. Ohishi, S. Saito, T. Kambe, S. Ishihara, N. Ikeda, S. Iwai

    Journal of Luminescence   2011

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  • Terahertz Spectroscopy of Electronic Ferroelectric LuFe2O4 Crystal Reviewed

    Kitahara Hideaki, Kano Jun, Fukada Yukimasa, Kambe Takashi, Ikeda Naoshi, Hangyo Masanori

    2011 36TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ)   2011

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  • Direct observation of low-temperature superstructure in spin- and charge-frustrated ferrite YFe<inf>2</inf> O<inf>4-δ</inf>

    Y. Horibe, N. Ikeda, K. Yoshii, S. Mori

    Physical Review B - Condensed Matter and Materials Physics   82   2010.11

  • Magnetic and dielectric study of R0.5Sr0.5MnO3 (R = Gd, Tb and Dy)

    Kenji Yoshii, Yusuke Hiramitsu, Yuka Okajima, Yasuhiro Yoneda, Yasuo Nishihata, Jun&apos;ichiro Mizuki, Akio Nakamura, Yutaka Shimojo, Yoshinobu Ishii, Yukio Morii, Naoshi Ikeda

    MATERIALS RESEARCH BULLETIN   45 ( 11 )   1574 - 1580   2010.11

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    DOI: 10.1016/j.materresbull.2010.07.024

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  • Quantitative analysis of O-2 gas sensing characteristics of picene thin film field-effect transistors

    Xuesong Lee, Yasuyuki Sugawara, Akio Ito, Shuhei Oikawa, Naoko Kawasaki, Yumiko Kaji, Ryoji Mitsuhashi, Hideki Okamoto, Akihiko Fujiwara, Kenji Omote, Takashi Kambe, Naoshi Ikeda, Yoshihiro Kubozono

    ORGANIC ELECTRONICS   11 ( 8 )   1394 - 1398   2010.8

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    DOI: 10.1016/j.orgel.2010.06.003

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  • Relaxation of geometrical frustration in NbSe3 topological crystals

    T. Tsuneta, K. Yamamoto, N. Ikeda, Y. Nogami, T. Matsuura, S. Tanda

    PHYSICAL REVIEW B   82 ( 1 )   014105   2010.7

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    DOI: 10.1103/PhysRevB.82.014105

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  • Charge Order Competition Leading to Nonlinearity in Organic Thyristor Family

    Yoshio Nogami, Noriaki Hanasaki, Masashi Watanabe, Kenichiro Yamamoto, Takayoshi Ito, Naoshi Ikeda, Hiroyuki Ohsumi, Hidenori Toyokawa, Yukio Noda, Ichiro Terasaki, Hatsumi Mori, Takehiko Mori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   79 ( 4 )   44606   2010.4

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  • Growth and characterization of bismuth magnesium titanate Bi(Mg 1/2Ti1/2)O3

    Yasuhiro Yoneda, Hiroyuki Saitoh, Kenji Yoshii, Takashi Nishida, Hironori Hayakawa, Naoshi Ikeda

    Key Engineering Materials   421-422   3 - 8   2010.2

  • Doping effect on charge ordered structure in RFe<inf>2</inf>O<inf>4</inf> (R=Lu and Yb)

    Y. Matsuo, S. Mori, A. Hirata, K. Yoshii, N. Ikeda

    Journal of Physics: Conference Series   200   2010.1

  • Multi-ferroicity of thin-film-stabilized hexagonal YbFeO<inf>3</inf>

    Y. Uesu, H. Iida, T. Koizumi, K. Kohn, S. Mori, N. Ikeda, R. Haumont, J. M. Kiat

    Proceedings of the 2010 IEEE International Symposium on the Applications of Ferroelectrics, ISAF 2010, Co-located with the 10th European Conference on the Applications of Polar Dielectrics, ECAPD 2010   2010.1

  • The modulated structure and ferromagnetic insulating state in a nine-layer BaRuO3

    Chao-Hung Du, Chang-Hung Yao, Dah-Chin Ling, Mau-Tsu Tang, Fon-Chi Hsu, Hsiang-Lin Liu, P. D. Hatton, Naoshi Ikeda

    JOURNAL OF PHYSICS-CONDENSED MATTER   22 ( 3 )   3036003   2010.1

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    DOI: 10.1088/0953-8984/22/3/036003

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  • High Pressure and Temperature Synthesis of Bi-based Perovskite (Bi0.5Na0.5-xLix)TiO3

    Masanori Fukunaga, Yasuhiro Yoneda, Ryota Fukuyama, Hiroyuki Saitoh, Naoshi Ikeda, Yoshinori Katayama

    Transactions of the Materials Research Society of Japan   35 ( 1 )   111 - 114   2010

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    DOI: 10.14723/tmrsj.35.111

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  • Magneto-electric effect in charge-ordered LuFe2O4

    Takashi Kambe, Takuma Komatsu, Takamasa Michiuchi, Hiroki Hayakawa, Daisuke Ohishi, Noriaki Hanasaki, Kenji Yoshii, Naoshi Ikeda

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200   012077   2010

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    DOI: 10.1088/1742-6596/200/1/012077

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  • Structural characterization and dielectric properties of hexagonal Lu(Fe, Ti)O<inf>3</inf>

    Yoji Matsuo, Takuya Hoshiyama, Shigeo Mori, Kenji Yoshii, Yuichi Michiue, Takashi Kambe, Naoshi Ikeda, Francisco Brown, Noboru Kimizuka

    Japanese Journal of Applied Physics   48 ( 9 )   09KB04 - 09KB04-3   2009.12

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    DOI: 10.1143/JJAP.48.09KB04

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  • Oxygen-deficient effect on charge ordering in spin- and charge-frustrated ferrite YFe2O4-delta

    Y. Horibe, K. Yoshii, N. Ikeda, S. Mori

    PHYSICAL REVIEW B   80 ( 9 )   092104-092104   2009.9

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  • Syntheses, Structures and Solid-State Properties of MMX Mixed-Valence Chains, [Ni-2(II/III)(RCS2)(4)I](infinity) (R = Et, n-Pr and n-Bu): Evidence of a Spin-Peierls Transition

    Minoru Mitsumi, Yuji Yoshida, Akihisa Kohyama, Yasutaka Kitagawa, Yoshiki Ozawa, Mototada Kobayashi, Koshiro Toriumi, Makoto Tadokoro, Naoshi Ikeda, Mitsutaka Okumura, Mohamedally Kurmoo

    INORGANIC CHEMISTRY   48 ( 14 )   6680 - 6691   2009.7

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    DOI: 10.1021/ic900630a

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  • Magnetic and dielectric properties of YbFe2-xMnxO4 (0 &lt;= x &lt;= 1)

    Kenji Yoshii, Naoshi Ikeda, Takamasa Michiuchi, Yusuke Yokota, Yuka Okajima, Yasuhiro Yoneda, Yoji Matsuo, Yoichi Horibe, Shigeo Mori

    JOURNAL OF SOLID STATE CHEMISTRY   182 ( 7 )   1611 - 1618   2009.7

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    DOI: 10.1016/j.jssc.2009.04.008

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  • High-performance C-60 and picene thin film field-effect transistors with conducting polymer electrodes in bottom contact structure

    Yumiko Kaji, Ryoji Mitsuhashi, Xuesong Lee, Hideki Okamoto, Takashi Kambe, Naoshi Ikeda, Akihiko Fujiwara, Minoru Yamaji, Kenji Omote, Yoshihiro Kubozono

    ORGANIC ELECTRONICS   10 ( 3 )   432 - 436   2009.5

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    DOI: 10.1016/j.orgel.2009.01.006

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  • Ferroelectricity from Ordering of Fe Valences in the Rare-Earth Iron Oxides RFe_2O_4 (R = Y, Ho-Lu)

    YOSHII Kenji, IKEDA Naoshi, MATSUO Yoji, MORI Shigeo

    X-RAYS   51 ( 2 )   162 - 168   2009.4

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    The rare-earth iron oxides RFe2O4 (R = Y, Ho-Lu) have a rhombohedral crystal structure, consisting of an alternating stacking of triangular lattices of R, Fe and O ions. Recently, we have proposed that this system shows a new mechanism of ferroelectricity ; the ferroelectric state originates from a polar charge-ordered structure of Fe2+ and Fe3+ on a triangular lattice. In this article, a review is given on the details of this ferroelectricity, which were revealed by measurements of synchrotron X-ray diffraction and dielectric properties of one of the RFe2O4 oxides, LuFe2O4.

    DOI: 10.5940/jcrsj.51.162

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  • Commensurate-incommensurate urate transition of charge density waves in o-TaS3

    K. Inagaki, M. Tsubota, K. Ichimura, S. Tanda, K. Yamamoto, N. Hanasaki, Y. Nogami, N. Ikeda, T. Ito, H. Toyokawa

    PHYSICA B-CONDENSED MATTER   404 ( 3-4 )   396 - 398   2009.3

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  • Current-Density Dependence of the Charge-Ordering Gap in the Organic Salt theta-(BEDT-TTF)(2)CsM(SCN)(4) (M = Zn, Co, and Co0.7Zn0.3)

    Fumiaki Sawano, Tomohiro Suko, Taichi S. Inada, Shuichi Tasaki, Ichiro Terasaki, Hatsumi Mori, Takehiko Mori, Yoshio Nogami, Naoshi Ikeda, Masashi Watanabe, Yukio Noda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   78 ( 2 )   24714-024714   2009.2

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  • Nanometer-Sized Domain Structures in LuFeMO4 (M = Cu, Co) Revealed by Energy-Filtered Transmission Electron Microscopy

    Y. Matuso, A. Hirata, Y. Horibe, K. Yoshii, N. Ikeda, S. Mori

    FERROELECTRICS   380   56 - 62   2009

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    DOI: 10.1080/00150190902873204

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  • Magnetic and Dielectric Properties of R0.5Ca0.5MnO3 (R = Eu-Lu)

    Kenji Yoshii, Yusuke Hiramitsu, Yasuhiro Yoneda, Yuka Okajima, Yasuo Nishihata, Jun'Ichiro Mizuki, Naoshi Ikeda

    FERROELECTRICS   379   407 - 414   2009

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    DOI: 10.1080/00150190902852208

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  • Stoichiometric Study of the Dielectric and Magnetic Properties in Charge Frustrated System LuFe2O4

    Takamasa Michiuchi, Yusuke Yokota, Takuma Komatsu, Hironori Hayakawa, Tomoko Kuroda, Daisuke Maeda, Yoji Matsuo, Shigeo Mori, Kenji Yoshii, Noriaki Hanasaki, Takashi Kambe, Naoshi Ikeda

    FERROELECTRICS   378   175 - 180   2009

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    DOI: 10.1080/00150190902859187

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  • Local Structure Analysis of Cubic Perovskite CaCu3Ti4O12

    Yoneda Yasuhiro, Yoshii Kenji, Hayakawa Hironori, Ikeda Naoshi

    Trans. Mat. Res. Soc. Japan   34 ( 1 )   15 - 15   2009

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    Recently, there has been considerable interest in the dielectric properties of the cubic perovskite CaCu3Ti4O12. The material has shown to have relatively high temperature independent dielectric permittivity over a wide temperature range from 100 K to 600 K. Below ~ 100 K the permittivity drops by almost three orders of magnitude, but is not accompanied by a structural phase transition. We studied CaCu3Ti4O12 hoping to find signatures of local structural distortions that may explain the observe anomalies in the dielectric properties. Experiments were carried out using synchrotron radiation at several temperatures between room temperature and 10 K. Reconsideration is necessary for interpreting a huge permittivity by the local disorder model.

    DOI: 10.14723/tmrsj.34.15

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  • Synchrotron X-ray study of charge density waves in o-TaS3 Reviewed

    Inagaki K, Tsubota M, Ichimura K, Tanda S, Yamamoto K, Hanasaki N, Nogami Y, Ikeda N, Ito T, Toyokawa H

    25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4   150   2009

  • Local Structure Modulation in the Electronic Ferroelectric Oxide LuFe2O4

    Hayakawa Hironori, Morimoto Masanori, Ikeda Naoshi, Yoneda Yasuhiro, Kohara Shinji, Yoshii Kenji, Matsuo Yoji, Michiuchi Takamasa, Mori Shigeo

    Trans. Mat. Res. Soc. Japan   34 ( 1 )   51 - 51   2009

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    We have investigated the physical properties and local atomic structure of LuFe2O4, a material belonging to the multiferroic system RFe2O4 (R: rare earths) which shows the new type of ferroelectricity owing to the charge ordering of Fe ions. Magnetic measurements showed the ferromagnetic ordering of Fe spins at ~230 K, as reported previously. From dielectric measurements, the dielectric constant (ε) of ~10000 was obtained at around room temperature. In addition, a peak of ε was observed near the charge-ordering temperature (~330 K). The peak temperature was insensitive to the frequency of AC electric field; this behavior is different from that found in a previous study. The pair-distribution function analysis on a high-energy X-ray diffraction pattern revealed that LuFe2O4 has the systematic modulation of the local atomic displacement.

    DOI: 10.14723/tmrsj.34.51

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  • RFe2O4の電荷秩序による強誘電性

    池田直

    日本物理学会誌   64   535 - 539   2009

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  • Effects of Oxygen Annealing on Dielectric Properties of LuFeCuO4

    Yoji Matsuo, Muneyasu Suzuki, Yuji Noguchi, Takeshi Yoshimura, Norifumi Fujimura, Kenji Yoshi, Naoshi Ikeda, Shigeo Mori

    JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 11 )   8464 - 8467   2008.11

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    DOI: 10.1143/JJAP.47.8464

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  • Ferroelectric properties of triangular charge-frustrated LuFe(2)O(4)

    Naoshi Ikeda

    JOURNAL OF PHYSICS-CONDENSED MATTER   20 ( 43 )   434218   2008.10

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    DOI: 10.1088/0953-8984/20/43/434218

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  • Temperature and electric-current dependence of charge-ordered domains in theta-(BEDT-TTF)(2)CsZn(SCN)(4)

    T. Ito, M. Watanabe, K. -I. Yamamoto, N. Ikeda, Y. Nogami, Y. Noda, H. Mori, T. Mori, I. Terasaki

    EPL   84 ( 2 )   26002   2008.10

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    DOI: 10.1209/0295-5075/84/26002

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  • Field-induced discommensuration in charge density waves in o-TaS3

    Katsuhiko Inagaki, Masakatsu Tsubota, Kazuki Higashiyama, Koichi Ichimura, Satoshi Tanda, Kenichiro Yamamoto, Noriaki Hanasaki, Naoshi Ikeda, Yoshio Nogami, Takayoshi Ito, Hidenori Toyokawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 9 )   093708   2008.9

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  • Effect of oxygen vacancies on charge ordered structure in YFe2O4-delta

    Shigeo Mori, Satoshi Shinohara, Yoji Matsuo, Yoichi Horibe, Kenji Yoshii, Naoshi Ikeda

    JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 9 )   7595 - 7598   2008.9

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    DOI: 10.1143/JJAP.47.7595

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  • Magnetic and dielectric properties of HoFe2O4 and R1-xRx &apos; Fe2O4 (R, R &apos;: rare earths)

    Kenji Yoshi, Yasuhiro Yoneda, Daisuke Maeda, Yusuke Yokota, Takamasa Michiuchi, Takuma Komatsu, Naoshi Ikeda, Yoji Matsuo, Shigeo Mori

    JAPANESE JOURNAL OF APPLIED PHYSICS   47 ( 9 )   7599 - 7602   2008.9

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    DOI: 10.1143/JJAP.47.7599

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  • Magnetic and dielectric properties of InFe2O4, InFeCuO4, and InGaCuO4

    Kenji Yoshii, Naoshi Ikeda, Yuka Okajima, Yasuhiro Yoneda, Yoji Matsuo, Yoichi Horibe, Shigeo Mori

    INORGANIC CHEMISTRY   47 ( 14 )   6493 - 6501   2008.7

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    DOI: 10.1021/ic702365k

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  • Non-thermal evidence for current-induced melting of charge order in theta-(BEDT-TTF)(2)CsZn(SCN)(4)

    Masashi Watanabe, Kenichiro Yamamoto, Takayoshi Ito, Yusaku Nakashima, Makoto Tanabe, Noriaki Hanasaki, Naoshi Ikeda, Yoshio Nogami, Hiroyuki Ohsumi, Hidenori Toyokawa, Yukio Noda, Ichiro Terasaki, Fumiaki Sawano, Tomohiro Suko, Hatsumi Mori, Takehiko Mori

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 6 )   65004   2008.6

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    DOI: 10.1143/JPSJ.77.065004

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  • Electronic ferroelectricity from charge ordering in RFe2O4

    Naoshi Ikeda, Yoji Matsuo, Shigeo Mori, Kenji Yoshi

    IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL   55 ( 5 )   1043 - 1045   2008.5

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    DOI: 10.1109/TUFFC.2008.753

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  • Charge Ordered Structure and Dielectric Properties in LuFe_2O_4

    MATSUO Yoji, YOSHII Kenji, IKEDA Naoshi, MORI Shigeo

    X-RAYS   50 ( 2 )   150 - 154   2008.4

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    Recent works revealed that a ferroelectric polarization in the charge-frustrated system LuFe2O4 originates from an emergence of the charge ordering, which is characterized by a regular arrangement of Fe2+ and Fe3+ ions on the frustrated triangular lattice. In this work, we have investi-gated both the charge ordered (CO) structure and charge ordering processes mainly by means of the transmission electron microscopy (TEM) . Both the CO structure and charge ordering processes depend strongly on the amount of the oxygen deficiency (δ) involved in LuFe2O4-δ. In the case of δ-0, the three-dimensional CO structure with the modulation vector of q= [1/3 1/3 1/2] was formed at room temperature. On the other hand, as δ was increased, the three-dimensional CO structure changed into the two-dimensional CO one and the coherent length becomes shorter along the [001] direction. For proper understanding of the dielectric and magnetic properties in LuFe2O4 and related materials, it should be essential to prepare LuFe2O4-δ samples with properly controlled oxygen-concentration and elucidate the physical properties in LuFe2O4-δ with δ-0.

    DOI: 10.5940/jcrsj.50.150

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  • Devil's flower resulting from a successive charge disproportionation of NaV_2O_5 : Understanding of the details of the Ising spin and the competitive interactions which made the devil's flower bloom

    OHWADA Kenji, FUJII Yasuhiko, MURAOKA Jiro, NAKAO Hironori, MURAKAMI Youichi, NODA Yukio, OHSUMI Hiroyuki, IKEDA Naoshi, SHOBU Takahisa, ISOBE Masahiko, UEDA Yutaka

    放射光   21 ( 2 )   87 - 96   2008.3

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  • Dilution effect on microstructures with respect to magnetic and dielectric properties in charge-ordered ferroelectric LuFe(2)O(4)

    Y. Matsuo, Y. Horibe, K. Yoshii, N. Ikeda, S. Mori

    TRANSACTIONS OF THE MATERIALS RESEARCH SOCIETY OF JAPAN, VOL 33, NO 1   33 ( 1 )   31 - 34   2008

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  • Relaxation of geometrical frustration in NbSe3 topological crystals

    Taku Tsuneta, Yoshio Nogami, Kenichirou Yamamoto, Naoshi Ikeda, Satoshi Tanda

    ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES   64   C509 - C509   2008

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  • Magnetic and dielectric properties of Tb0.5Ca0.5MnO3

    Yusuke Hiramitsu, Kenji Yoshii, Yasuhiro Yoneda, Jun'ichiro Mizuki, Akio Nakamura, Yutaka Shimojo, Yoshinobu Ishii, Yukio Morii, Naoshi Ikeda

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46 ( 10B )   7171 - 7174   2007.10

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    DOI: 10.1143/JJAP.46.7171

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  • Lattice modulation in YMn2O5 and TbMn2O5 studied by using synchrotron radiation X-rays

    Y. Noda, H. Kimura, Y. Kamada, Y. Ishikawa, S. Kobayashi, Y. Wakabayashi, H. Sawa, N. Ikeda, K. Kohn

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   51 ( 2 )   828 - 831   2007.8

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  • Magnetic and dielectric properties of RFe2O4, RFeMO4, and RGaCuO4 (R=Yb and Lu, M=Co and Cu)

    Kenji Yoshii, Naoshi Ikeda, Yoji Matsuo, Yoichi Horibe, Shigeo Mori

    PHYSICAL REVIEW B   76 ( 2 )   1 - 12   2007.7

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    DOI: 10.1103/PhysRevB.76.024423

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  • Magnetic and dielectric behavior of TmFe2O4 and TmFeCuO4

    Kenji Yoshii, Naoshi Ikeda, Shigeo Mori

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   1154 - 1156   2007.3

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    DOI: 10.1016/j.jmmm.2006.10.327

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  • Structural properties of a mixed valence compound Fe2BO4

    S. Shimomura, S. Nakamura, N. Ikeda, E. Kaneko, K. Kato, K. Kohn

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   793 - 795   2007.3

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    DOI: 10.1016/j.jmmm.2006.10.184

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  • Magnetic and dielectric behavior of Magnetic and Dielectric Behavior of the Ruthenium Double Perovskite Oxides R2MRuO6 (R=La, Pr and Nd, M=Mg, Co, Ni and Zn)

    K. Yoshii, N. Ikeda, S. Mori, Y. Yoneda, M. Mizumaki, H. Tanida, Naomi Kawamura

    Trans. Mater. Res. Soc. Jpn.   32 ( 1 )   51 - 54   2007

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  • Structural relations between two ground states of NaV2O5 under high pressure: A synchrotron x-ray diffraction study

    K. Ohwada, Y. Fujii, J. Muraoka, H. Nakao, Y. Murakami, Y. Noda, H. Ohsumi, N. Ikeda, T. Shobu, M. Isobe, Y. Ueda

    Physical Review B   76 ( 9 )   094113   2007

  • &lt;bold&gt;Electronic Ferroelectricity from Charge Ordering in RFe2O4&lt;/bold&gt; Reviewed

    N. Ikeda, S. Mori, K. Yoshii, Y. Matsuo

    2007 SIXTEENTH IEEE INTERNATIONAL SYMPOSIUM ON THE APPLICATIONS OF FERROELECTRICS, VOLS 1 AND 2   253 - +   2007

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  • Magnetic and Dielectric Properties of Rare-Earth Iron and Manganese Oxide Systems

    K. Yoshii, N. Ikeda

    Focus on Solid State Chemistry (Ed. by Arte M. Newman)   63 - 75   2007

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  • Ferroelectricity from electron ordering

    N. Ikeda, S. Mori, K. Yoshii, Y. Matsuo

    Mater. Res. Symp. Proc   966 ( 0966-T01-03 )   1 - 9   2007

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  • Ferroelectricity from valence ordering in RFe2O4

    Naoshi Ikeda, Shigeo Mori, Kenji Yoshii

    FERROELECTRICS   348   440 - +   2007

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    DOI: 10.1080/00150190701196112

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  • Structural phase transition in two-dimensional crystallites of organic dye molecules formed on aqueous subphases

    Noritaka Kato, Ichiro Hirosawa, Masugu Sato, Naoshi Ikeda, Ken-Ichi Iimura, Yoshiaki Uesu

    Ferroelectrics   346   162 - 167   2007

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    DOI: 10.1080/00150190601182477

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  • Lattice modulation induced by antiferromagnetic orderings in multiferroic RMn2O5

    Hiroyuki KIMURA, Satoru KOBAYASHI, Youichi KAMADA, Yoshihisa ISHIKAWA, Kohei KADOSHITA, Yukio NODA, Naoshi IKEDA, Yusuke WAKABAYASHI, Kay KOHN

    Photon Factory Activity Report   24 ( B )   176   2007

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  • Doping effect on the charge ordering in LuFe2O4

    Yoji Matsuo, Satoshi Shinohara, Shigeo Mori, Yoichi Horibe, Kenji Yoshii, Naoshi Ikeda

    Materials Research Society Symposium Proceedings   966   22 - 27   2006.12

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  • Relation between ferroelectric and antiferromagnetic order in RMn2O5

    Yukio Noda, Hiroyuki Kimura, Youichi Kamada, Toshihiro Osawa, Yosikazu Fukuda, Yoshihisa Ishikawa, Satoru Kobayashi, Yusuke Wakabayashi, Hiroshi Sawa, Naoshi Ikeda, Kay Kohn

    PHYSICA B-CONDENSED MATTER   385   119 - 122   2006.11

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    DOI: 10.1016/j.physb.2006.05.179

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  • Magnetic and dielectric properties of the ruthenium double perovskites La2MRuO6 (M = Mg, Co, Ni, and Zn)

    Kenji Yoshii, Naoshi Ikeda, Masaichiro Mizumaki

    PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE   203 ( 11 )   2812 - 2817   2006.9

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    DOI: 10.1002/pssa.200669549

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  • Resonant X-ray scattering study at YK-edge in Y1-xCaxTiO3

    Hironori Nakao, Soukichi Kodama, Kouhei Kiyoto, Youichi Murakami, Masami Tsubota, Fumitoshi Iga, Kazuyuki Uchihira, Toshiro Takabatake, Hiroyuki Ohsumi, Masaichiro Mizumaki, Naoshi Ikeda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 9 )   2006.9

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    DOI: 10.1143/JPSJ.75.094706

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  • Erratum: Spontaneous formation of vanadium "molecules" in a geometrically frustrated crystal: AlV2O4 ( Physical Review Letters (2006) 96 (086406))

    Y. Horibe, M. Shingu, K. Kurushima, H. Ishibashi, N. Ikeda, K. Kato, Y. Motome, N. Furukawa, S. Mori, T. Katsufuji

    Physical Review Letters   96   2006.5

  • Direct determination of low-dimensional structures: Synchrotron X-ray scattering on one-dimensional charge-ordered MMX-chain complexes

    Yusuke Wakabayashi, Atsushi Kobayashi, Hiroshi Sawa, Hiroyuki Ohsumi, Naoshi Ikeda, Hiroshi Kitagawa

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   128 ( 20 )   6676 - 6682   2006.5

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    DOI: 10.1021/ja060111j

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  • Magnetic and dielectric properties of frustrated ferrimagnet TmFe2O4

    K Yoshii, N Ikeda, A Nakamura

    PHYSICA B-CONDENSED MATTER   378-80   585 - 586   2006.5

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    DOI: 10.1016/j.physb.2006.01.155

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  • Structure and random anisotropy in single-phase Ni nanocrystals

    E Kita, N Tsukuhara, H Sato, K Ota, H Yangaihara, H Tanimoto, N Ikeda

    APPLIED PHYSICS LETTERS   88 ( 15 )   2006.4

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    DOI: 10.1063/1.2188597

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  • Spontaneous formation of vanadium "molecules" in a geometrically frustrated crystal: AlV2O4

    Y Horibe, M Shingu, K Kurushima, H Ishibashi, N Ikeda, K Kato, Y Motome, N Furukawa, S Mori, T Katsufuji

    PHYSICAL REVIEW LETTERS   96 ( 8 )   2006.3

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    DOI: 10.1103/PhysRevLett.96.086406

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  • X-ray Diffuse Scattering Study of Modulated Structure in θ-(BEDT-TTF)2CsM'(SCN)4 Under Electric Field

    Y. Nogami, Masashi Watanabe, Naoshi Ikeda, T. Ito, K. Yamamoto, Yukio Noda, I. Terasaki, H. Mori, T. Mori

    SPring-8 User Experiment Reports 2005A   2006

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  • X-ray and neutron transparent pulse magnets

    E. Ohmichi, N. Ikeda, Y. Nogami, T. Osada

    YAMADA CONFERENCE LX ON RESEARCH IN HIGH MAGNETIC FIELDS   51   498 - +   2006

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    DOI: 10.1088/174-6596/51/1/113

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  • Conduction characteristics of charge ordering type ferroelectrics,YFe <inf>2</inf>O<inf>4</inf>

    Ken Imamura, Yoichi Horibe, Takeshi Yoshimura, Norifumi Fujimura, Shigeo Mori, Naoshi Ikeda

    Materials Research Society Symposium Proceedings   966   210 - 216   2006

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    DOI: 10.1557/proc-0966-t07-27

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  • Development of X-ray Analysis Method for Topological Crystals

    K. Yamamoto, T. Ito, N. Ikeda, S. Horita, N. Irie, Y, Nogami T. Tsuneta, S. Tanda

    Topology in Ordered Phase (World Scientific)   86-94   2006

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  • Structure Analysis of Topological Crystal using Synchrotron Radiation

    Y. Nogami, T. Tsuneta, K. Yamamoto, N. Ikeda, T. Ito, N. Irie, S. Tanda

    Topology in Ordered Phase (World Scientific)   52-57   2006

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  • X-ray structural study of charge and anion orderings of TMTTF salts

    Y Nogami, T Ito, K Yamamoto, N Irie, S Horita, T Kambe, N Nagao, K Oshima, N Ikeda, T Nakamura

    JOURNAL DE PHYSIQUE IV   131   39 - 42   2005.12

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    DOI: 10.1051/jp4:2005131008

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  • Structure, magnetism and transport of the perovskite manganites Ln(0.5)Ca(0.5)MnO(3) (Ln = Ho, Er, Tm, Yb and Lu)

    K Yoshii, H Abe, N Ikeda

    JOURNAL OF SOLID STATE CHEMISTRY   178 ( 12 )   3615 - 3623   2005.12

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    DOI: 10.1016/j.jssc.2005.08.033

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  • Nano-sized domains related to dielectric anomaly in YFe2O4-delta

    Y Horibe, K Kishimoto, S Mori, N Ikeda

    JOURNAL OF ELECTRON MICROSCOPY   54   I87 - I90   2005.9

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    DOI: 10.1093/jmicro/dfi009

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  • Ferro-type orbital state in the mott transition system Ca2-xSrxRuO4 studied by the resonant X-ray scattering interference technique

    M Kubota, Y Murakami, M Mizumaki, H Ohsumi, N Ikeda, S Nakatsuji, H Fukazawa, Y Maeno

    PHYSICAL REVIEW LETTERS   95 ( 2 )   2005.7

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    DOI: 10.1103/PhysRevLett.95.026401

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  • Structural properties and phase transition of hole-orbital-ordered (C2H5NH3)(2)CuCl4 studied by resonant and non-resonant x-ray scatterings under high pressure

    K Ohwada, K Ishii, T Inami, Y Murakami, T Shobu, H Ohsumi, N Ikeda, Y Ohishi

    PHYSICAL REVIEW B   72 ( 1 )   2005.7

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    DOI: 10.1103/PhysRevB.72.014123

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  • Determination of a merocyanine J-aggregate structure and the significant contribution of the electric dipole interaction to the exciton band wavelength

    N Kato, K Yuasa, T Araki, Hirosawa, I, M Sato, N Ikeda, K Iimura, Y Uesu

    PHYSICAL REVIEW LETTERS   94 ( 13 )   2005.4

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    DOI: 10.1103/PhysRevLett.94.136404

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  • Structural phase transitions and dielectric anomaly in YFe2O4-delta

    Y Horibe, K Kishimoto, S Mori, N Ikeda

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   46 ( 1 )   192 - 194   2005.1

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  • Grazing incidence X-ray diffraction of merocyanine J-aggregate monolayers at the air-water interface

    N. Kato, K. Yuasa, T. Araki, Y. Uesu, I. Hirosawa, M. Sato, N. Ikeda, K. Iimura

    Trans. Mat. Res. Soc. Jpn.   2005

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  • Charge ordering and dielectric dispersion in mixed valence oxides RFe2O4

    N Ikeda, S Mori, K Kohn

    FERROELECTRICS   314   41 - 56   2005

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    DOI: 10.1080/00150190590926085

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  • Structural phase transition of J-aggregate crystallites on the binary counter-ion subphase

    N Kato, T Araki, Y Uesu, M Sato, Hirosawa, I, N Ikeda, K Iimurac

    FERROELECTRICS   314   135 - 141   2005

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    DOI: 10.1080/00150190590926319

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  • Diffuse Scattering in θ-(BEDT-TTF)2CsZn(SCN)4 under Electric Field at Low temperature

    N. Ikeda, M. Watanabe, T. Ito, Y. Nogami, S. Komiyama, Y. Noda, I. Terasaki, H. Mori, T. Mori

    SPring-8 User Experiment Report   14   301 - 301   2005

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  • Decrease in X-ray diffuse scattering intensity reflecting two-fold structural modulation in θ-(BEDT-TTF)2CsZn(SCN)4 under Electric Field

    Y. Nogami, M. Watanabe, N. Ikeda, T. Ito, K. Yamamoto, Y. Noda, I. Terasaki, H. Mori, T. Mori

    SPring-8 User Experiment Report   15   18 - 18   2005

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  • Spin-Peierls Transition in Halogen-Bridged Mixed-Valence MMX Chain Compounds

    Koshiro Toriumi, Minoru Mitsumi, Yuji Yoshida, Akihisa Kohyama, Naoshi Ikeda, Nobuhiro Yasuda, Yoshiki Ozawa

    ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES   61   C327 - C327   2005

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  • Structural properties and phase transition of hole-orbital-ordered (C2H5NH3)2CuCl4 studied by resonant and non-resonant x-ray scatterings under high pressure Reviewed

    Kenji Ohwada, Kenji Ishii, Toshiya Inami, Youichi Murakami, Takahisa Shobu, Hiroyuki Ohsumi, Naoshi Ikeda, Yasuo Ohishi

    Physical Review B - Condensed Matter and Materials Physics   72 ( 1 )   2005

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    DOI: 10.1103/PhysRevB.72.014123

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  • Dielectric anomaly and structural phase transitions in YFe 2O4-δ

    Y. Horibe, K. Kishimoto, S. Mori, N. Ikeda

    Integrated Ferroelectrics   67   151 - 157   2004.12

  • Structural change on the magnetic field-induced insulator-to-metal transition in distorted perovskite Eu<inf>0.6</inf>Sr<inf>0.4</inf>MnO <inf>3</inf>

    Shin Nakamura, Shin Nakamura, Susumu Shimomura, Naoshi Ikeda, Shigeki Nimori, Takao Takeuchi, Kikuo Itoh

    Journal of the Physical Society of Japan   73 ( 11 )   3059 - 3063   2004.11

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    DOI: 10.1143/JPSJ.73.3059

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  • Magnetic structure of CoO studied by neutron and synchrotron x-ray diffraction Reviewed

    K Tomiyasu, T Inami, N Ikeda

    PHYSICAL REVIEW B   70 ( 18 )   1 - 6   2004.11

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    DOI: 10.1103/PhysRevB.70.184411

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    Other Link: http://orcid.org/0000-0003-2764-0908

  • Frustration and ordering of iron ions on triangular iron mixed valence system RFe<inf>2</inf>O<inf>4</inf>

    N. Ikeda, H. Ohsumi, M. Mizumaki, S. Mori, Y. Horibe, K. Kishimoto

    Journal of Magnetism and Magnetic Materials   272-276   2004.5

  • Magnetic field induced phase transition in distorted perovskite Eu <inf>0.6</inf>Sr<inf>0.4</inf>MnO<inf>3</inf>

    Shin Nakamura, Shin Nakamura, Susumu Shimomura, Naoshi Ikeda, Masaichiro Mizumaki, Hiroyuki Ohsumi, Shigeki Nimori, Takao Takeuchi, Kikuo Itoh

    Journal of Magnetism and Magnetic Materials   272-276   424 - 425   2004.1

  • Magnetic behavior of some rare-earth transition-metal perovskite oxide systems

    Kenji Yoshii, Akio Nakamura, Masaichiro Mizumaki, Naoshi Ikeda, Jun'ichiro Mizuki

    Journal of Rare Earths   22   733 - 738   2004.1

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  • Relationship between charge stripe order and structural phase transitions in La1.875Ba0.125-xSrxCuO4 Reviewed

    H. Kimura, Y. Noda, H. Goka, M. Fujita, K. Yamada, M. Mizumaki, N. Ikeda, H. Ohsumi

    Phys. Rev. B   70 ( 13 )   134512/1 - 134512/8   2004

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    DOI: 10.1103/PhysRevB.70.134512

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  • Magnetic field induced phase transition in distorted perovskite Eu0.6Sr0.4MnO3 Invited

    Shin Nakamura, Susumu Shimomura, Naoshi Ikeda

    Sprin-8 Research Frontiers 2003   51 - 52   2004

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  • Structure transition and charge competition on YFe<inf>2</inf>O<inf>4</inf>

    Naoshi Ikeda, Ryosuke Mori, Shigeo Mori, Kay Kohn

    Ferroelectrics   286   175 - 184   2003.6

  • Critical phenomena in helical magnet beta-MnO2: X-ray magnetic scattering study Reviewed

    H Sato, Y Kawamura, T Ogawa, Y Murakami, H Ohsumi, M Mizumaki, N Ikeda

    PHYSICA B-CONDENSED MATTER   329   757 - 758   2003.5

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    DOI: 10.1016/S0921-4526(02)02501-2

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  • Synchrotron x-ray diffraction study of a charge stripe order in (formula presented)-doped (formula presented) Reviewed

    M. Fujita, H. Kimura, Y. Noda, K. Yamada, H. Goka, N. Ikeda

    Physical Review B - Condensed Matter and Materials Physics   67 ( 14 )   2003.4

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    DOI: 10.1103/PhysRevB.67.140503

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  • Review and Prospect of Ferroelectricity and Magnetism in YMn2O5 Reviewed

    Yukio Noda, Yoshikazu Fukuda, Hiroyuki Kimura, Isao Kagomiya, S. Matsumoto, Kay Kohn, Takahisa Shobu, Naoshi Ikeda

    Journal of the Korean Physical Society   42   S1192 - 1195   2003.4

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  • Synchrotron x-ray diffraction study of a charge stripe order in 1/8-doped La1.875Ba0.125-xSrxCuO4

    H. Kimura, H. Goka, M. Fujita, Y. Noda, K. Yamada, N. Ikeda

    Physical Review B - Condensed Matter and Materials Physics   67 ( 14 )   1405031 - 1405034   2003.4

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  • Synchrotron x-ray diffraction study of a charge stripe order in 1/8 -doped La1.875Ba0.125-xSrxCuO4

    H. Kimura, H. Goka, M. Fujita, Y. Noda, K. Yamada, N. Ikeda

    Phys. Rev. B   67   140503(1)-140503(3)   2003

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  • Study of 2D phase transition of polar organic dye molecules at the air-water interphase by using grazing-incidence x-ray diffraction

    N.Kato, I.Hirosawa, M.Sato, N.Ikeda, Y.Uesu

    Ferroelectrics   286   921 - 926   2003

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    DOI: 10.1080/00150190390206374

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  • Ground state of NaV2O5 under high pressure

    K. Ohwada, J. Muraoka, Y. Fujii, H. Nakao, Y. M. Murakami, Y. Noda, N. Ikeda, H. Ohsumi, M. Isobe, Y. Ueda

    SPring-8 User Experiment Report   10   14 - 14   2003

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  • Lattice Distortion at Ferroelectric Transition of YMn2O5

    I. Kagomiya, S. Mat.sumoto, K. Kohn, Y. Fukuda, T. Shobu, H. Kimura, Y. Noda, N. Ikeda

    Ferroelectrics   286   167 - 174   2003

  • Improvement of experimental technology at high pressure and low temperature and the observation of superlattice reflections of K3H(SO4)2 at high pressure

    Takahisa Shobu, M. Mizumaki, Hiroyuki Ohsumi, Naoshi Ikeda, Yukio Noda

    SPring-8 User Experiment Report   11   357 - 357   2003

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  • Ground state of NaV2O5 under high pressure 2

    K. Ohwada, Y. Fujii, H. Nakao, Y. M. Murakami, Y. Noda, N. Ikeda, H. Ohsumi, M. Isobe, Y. Ueda

    SPring-8 User Experiment Report   11   22 - 22   2003

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  • Ordered charge asphericity around dysprosium and structural deformation in DyB2C2 Reviewed

    H Adachi, H Kawata, M Mizumaki, T Akao, M Sato, N Ikeda, Y Tanaka, H Miwa

    PHYSICAL REVIEW LETTERS   89 ( 20 )   206401   2002.11

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    DOI: 10.1103/PhysRevLett.89.206401

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  • Symmetry breaking in the metal-insulator transition of BaVS<inf>3</inf>

    T. Inami, K. Ohwada, H. Kimura, M. Watanabe, Y. Noda, H. Nakamura, T. Yamasaki, T. Yamasaki, M. Shiga, N. Ikeda, Y. Murakami, Y. Murakami

    Physical Review B - Condensed Matter and Materials Physics   66   731081 - 731084   2002.8

  • X-ray absorption spectroscopy in NaCo2O4, LaCoO3 and SrCoO3 Reviewed

    T Matsushita, M Mizumaki, N Ikeda, M Nakazawa, A Agui, Y Saitoh, T Nakatani, A Yoshigoe, S Nakamura

    SURFACE REVIEW AND LETTERS   9 ( 2 )   1327 - 1331   2002.4

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  • Dielectric and structure properties of charge competing system YFe 2O4

    Naoshi Ikeda, Ryosuke Mori, Kay Kohn, Masaichiro Mizumaki, Takahiro Akao

    Ferroelectrics   272   309 - 314   2002.1

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    DOI: 10.1080/713716255

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  • Accurate Measurement of Lattice Parameters on YMn2O5 Reviewed

    Isao Kagomiya, Naoshi Ikeda, Yukio Noda, S. Matsumoto, Yoshikazu Fukuda, Hiroyuki Kimura, Kay Kohn

    SPring-8 User Experiment Report   7   26 - 26   2001.4

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  • X-ray Diffraction Study on Ca2 xY2-xCu5O10 Reviewed

    H. Yamaguchi, Hiroyuki Kimura, Masashi Watanabe, Yoshikazu Fukuda, Naoshi Ikeda, Yukio Noda

    SPring-8 User Experiment Report   6   18 - 18   2001.4

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  • Single Crystal Analysis of High-Pressure Phase of Solid Oxygen Reviewed

    Y. Akahama, E. Uemura, M. Harada, H. Kawamura, Masashi Watanabe, Yukio Noda, Naoshi Ikeda, Osamu Shimomura

    SPring-8 User Experiment Report   7   22 - 22   2001.4

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  • Development of BL02B1 Reviewed

    Naoshi Ikeda, Y. Yoneda, Takahisa Shobu, Hiroyuki Kimura, Masashi Watanabe, Yoshikazu Fukuda, Isao Kagomiya, S. Matsumoto, Yukio Noda

    SPring-8 User Experiment Report   6   23 - 23   2001.4

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  • "Devil's staircase"-type phase transition in NaV<inf>2</inf>O<inf>5</inf> under high pressure Reviewed

    Ohwada, K., Fujii, Y., Takesue, N., Isobe, M., Ueda, Y., Nakao, H., Wakabayashi, Y., Murakami, Y., Ito, K., Amemiya, Y., Fujihisa, H., Aoki, K., Shobu, T., Noda, Y., Ikeda, N.

    Physical Review Letters   87 ( 8 )   2001

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    DOI: 10.1103/PhysRevLett.87.086402

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  • Charge Frustration and Dielectric Dispersion in LuFe2O4

    Ikeda Naoshi, Kohn Kay, Myouga Nobuyuki, Takahashi Eri, Kit&ocirc;h Hijiri, Takekawa Shunji

    J Phys Soc Jpn   69 ( 5 )   1526 - 1532   2000.5

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    We report the dielectric anomaries at the phase transitions ofLu(Fe2+ Fe3+)O4, which is considered as a charge andspin frustrated system.Dielectric constant shows a hump, just above the transition from thehigh temperature two-dimensional to the low temperaturethree-dimensional charge ordering. A few glassy behaviors wereobserved at this transition. The presence of spontaneous polarizationin the low temperature phase was confirmed by the measurement ofpyroelectricity. A step-wise increase of the dielectric constant withincreasing temperature was observed between 150 K and 250 K as inother RFe2O4.These phenomena are explained by the presence of the polar domainswith the ordering of Fe2+ and Fe3+ and the motions of theantiphase boundaries between them.

    DOI: 10.1143/JPSJ.69.1526

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  • X-ray diffuse scattering study on charge-localized states

    S. Shimomura, T. Tonegawa, K. Tajima, N. Wakabayashi, N. Ikeda, T. Shobu, Y. Noda, Y. Tomioka, Y. Tokura

    Physical Review B - Condensed Matter and Materials Physics   62 ( 6 )   3875 - 3878   2000

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    DOI: 10.1103/PhysRevB.62.3875

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  • Synchrotron observation of the charge ordering and spontaneous polarization in LuFe<inf>2</inf>O<inf>4</inf>

    Naoshi Ikeda, Masahiko Tanaka, Hijiri Kitô, Satoshi Sasaki, Yasusada Yamada

    Ferroelectrics   222 ( 1-4 )   227 - 235   1999

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    DOI: 10.1080/00150199908014820

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  • Charge ordering in La1-xSrxMnO3 (x similar to 0.12) Reviewed

    Inami, T, Ikeda, N, Murakami, Y, Koyama, I, Wakabayashi, Y, Yamada, Y

    Japanese Journal of Applied Physics Part 1-Regular Papers Brief Communications & Review Papers   38   212 - 214   1999

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  • Charge ordering of LuFe<inf>2</inf>O<inf>4</inf> observed by an anomalous X-ray dispersion

    Naoshi Ikeda, Shinichiro Nohdo, Yasusada Yamada, Eri Takahashi, Kay Kohn

    Journal of the Korean Physical Society   32 ( SUPPL. 1 )   1998.2

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  • Valence fluctuation and polarization fluctuation in LuFe<inf>2</inf>O<inf>4</inf>

    Yasusada Yamada, Naoshi Ikeda

    Journal of the Korean Physical Society   32 ( SUPPL. 1 )   1998.2

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  • Dielectric dispersion and charge ordering of LuFe<inf>2</inf>O<inf>4</inf>

    Eri Takahashi, Kay Kohn, Naoshi Ikeda

    Journal of the Korean Physical Society   32 ( SUPPL. 1 )   1998.2

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  • Incommensurate Charge Ordering in Charge-Frustrated LuFe<inf>2</inf>O<inf>4</inf> System

    Yasusada Yamada, Shinichiro Nohdo, Naoshi Ikeda

    Journal of the Physical Society of Japan   66 ( 12 )   3733 - 3736   1997

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    DOI: 10.1143/JPSJ.66.3733

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  • Dipole glass behavior of RFe<inf>2</inf>O<inf>4</inf>

    N. Ikeda, K. Odaka, E. Takahashi, K. Kohn, K. Siratori

    Ferroelectrics   190 ( 1-4 )   191 - 196   1997

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    DOI: 10.1080/00150199708014115

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  • Incommensurate charge ordering in mixed valence system LuFe<inf>2</inf>O<inf>4</inf>

    Naoshi Ikeda, Yasusada Yamada, Shinichiro Nohdo, Toshiya Inami, Susumu Katano

    Physica B: Condensed Matter   241-243   820 - 822   1997

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    DOI: 10.1016/S0921-4526(97)00728-X

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  • Charge ordering in low-doping rate A<inf>1-x</inf>B<inf>x</inf>MnO<inf>3</inf> (A: La, Pr; B: Sr, Ca)

    T. Inami, O. Hino, S. Nohdo, R. Kanao, N. Ikeda, Y. Yamada, S. Katano

    Physica B: Condensed Matter   241-243   433 - 435   1997

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    DOI: 10.1016/S0921-4526(97)00611-X

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  • Anisotropy of Dielectric Dispersion in ErFe<inf>2</inf>O<inf>4</inf> Single Crystal

    Naoshi Ikeda, Kay Kohn, Hijiri Kito, Jun Akimitsu, Kiiti Siratori

    Journal of the Physical Society of Japan   64 ( 4 )   1371 - 1377   1995.4

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    DOI: 10.1143/JPSJ.64.1371

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  • Magnetic Relaxation in Diluted Triangular Antiferromagnet LuFeMgO<inf>4</inf>

    Naoshi Ikeda, Kay Kohn, Etsuko Himoto, Midori Tanaka

    Journal of the Physical Society of Japan   64 ( 11 )   4371 - 4377   1995

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    DOI: 10.1143/JPSJ.64.4371

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  • Possibility of magnetoelectric effect in antiferromagnetic rfe2o4

    Naoshi Ikeda, Kazuhiro Saito, Kay Kohn

    Ferroelectrics   161 ( 1 )   111 - 115   1994.1

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    DOI: 10.1080/00150199408213359

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  • Dielectric Relaxation and Hopping of Electrons in ErFe204

    Naoshi Ikeda, Kay Kohn, Hijiri Kito, Jun Akimitsu, Kiiti Siratori

    Journal of the Physical Society of Japan   63 ( 12 )   4556 - 4564   1994

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    DOI: 10.1143/JPSJ.63.4556

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  • Cd substitution effect on the superconducting transition temperature in RE<inf>1-x</inf>Cd<inf>x</inf>Ba<inf>2</inf>Cu<inf>3</inf>O<inf>y</inf>

    Naoshi Ikeda, Sadao Higuchi, Kay Kohn

    Phase Transitions   41 ( 1-4 )   209 - 215   1993.1

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    DOI: 10.1080/01411599308207781

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  • A simple alternating current magnetometer for high temperature superconductivity study

    Naoshi Ikeda, Kay Kohn

    Phase Transitions   42 ( 1-2 )   7 - 14   1993.1

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    DOI: 10.1080/01411599308203485

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  • Spin-glass behavior in amorphous BiFeO3 Reviewed

    Shin Nakamura, Susumu Soeya, Naoshi Ikeda, Midori Tanaka

    Journal of Applied Physics   74 ( 9 )   5652 - 5657   1993

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    DOI: 10.1063/1.354179

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  • Effect of Pr substitution on superconductivity in (PrxY1−x)Ba2Cu4O8

    Nobuyoshi Yamada, Zhen Guo, Naoshi Ikeda, Kay Kohn, Takeo Iri, Ken Ichiro Gondaira

    Physica C: Superconductivity   185-189   809 - 810   1991.12

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    DOI: 10.1016/0921-4534(91)91628-h

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  • A Simple Alternating Current Magnetometer of the Automatic Balancing Type

    Naoshi Ikeda, Kay Kohn

    Japanese Journal of Applied Physics   29 ( Part 1, No. 1 )   208 - 209   1990.1

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    An improvement of a Hartshorn type alternating current magnetometer is reported. The use of a dual channel oscillator, a two-phase lock-in amplifier and a personal computer enabled us to obtain a simple feedback system for automatic balancing of the bridge. The resolution of this system is about $3\times 10^{-7}$ emu of magnetic moment or higher at the field of 0.8 Oe in amplitude and 159 Hz in frequency.

    DOI: 10.1143/jjap.29.208

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  • Suppression of superconductivity by lanthanum substitution in the Bi4Ca3Sr3Cu4Oy system

    N. Ikeda, K. Kohn, E.V. Sampathkumaran, R. Vijayaraghavan

    Solid State Communications   68 ( 1 )   51 - 55   1988.10

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    DOI: 10.1016/0038-1098(88)90243-8

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  • Influence of chemical substituents on the superconductivity of the system Bi4Ca3Sr3Cu4Oy

    E V Sampathkumaran, N Ikeda, K Kohn, R Vijayaraghavan

    Journal of Physics F: Metal Physics   18 ( 8 )   L163 - L167   1988.8

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    DOI: 10.1088/0305-4608/18/8/004

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Books

  • 鉄複電荷酸化物 RFe2O4 が示す電子強誘電性の研究

    沖本洋一, 藤井達生, 池田 直( Role: Joint author ,  執筆責任者)

    日本結晶学会  2024.5 

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  • NaV2O5 の逐次電荷不均化による悪魔の花相図

    日本放射光学会  2008 

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  • 電子秩序化型誘電体の共鳴散乱

    シーエムシー出版  2008 

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  • 三角格子系鉄複合酸化物LuFe2O4における電荷秩序構造と誘電特性

    日本結晶学会  2008 

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  • 機能物質・材料開発と放射光-SPring-8の産業利用

    シーエムシー出版(東京)  2008 

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  • Focus on Solid State Chemistry

    Nova Science Publishers. Inc.  2007 

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  • The Large Debye-Scherrer Camera Installed at SPring-8 BL02B2 for Accurate Structure Studies

    International Union of Crystallography  2007 

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MISC

  • 金属-酸化物薄膜接合系におけるエネルギーバンドアライメント

    狩野旬, 押目典宏, 廣瀬哲, 上田剛慈, 安井伸太郎, 浜嵜容丞, 伊藤満, 三上仁志, 池田直, 藤井達生, 柏原浩大, SCHNEIDER Julien

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   80th   2019

  • 化学等量性のよいLuFe2O4の酸素欠損と磁性

    奥田洋平, 藤原孝将, 清宮僚人, 横山景祐, 沖本洋一, 腰原伸也, 安井伸太郎, 加倉井和久, 加倉井和久, 池田直

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019

  • Core-level binding-energy of BaTiO3 with pre- and post-application of electric field

    Oshime N., Itoh M., Fujii T., Yasui A., Kano J., Ikenaga E., Yasui S., Hinokuma S., Ikeda N., Hamasaki Y., Yasuhara S., Yokoya T.

    Meeting Abstracts of the Physical Society of Japan   73   2571 - 2571   2018

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    Language:Japanese   Publisher:The Physical Society of Japan  

    DOI: 10.11316/jpsgaiyo.73.1.0_2571

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  • 強誘電体BaTiO3薄膜の分極反転時における電子構造変化

    押目典宏, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃, 大沢仁志

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   79th   2018

  • 分極効果で変調される強誘電体BaTiO3薄膜の電子構造

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    日本セラミックス協会年会講演予稿集(CD-ROM)   2018   2018

  • 分極効果で変調される強誘電体BaTiO3薄膜の電子構造

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   65th   2018

  • エネルギー輸送の違いから見たカーボンナノチューブの通電加熱の効果

    中條大樹, 井上寛隆, 黒田泰平, 森本大我, 林拓磨, 徳永知春, 池田直, 横谷尚睦, 藤森和博, 羽田真毅, 西川亘, 山下善文, 紀和利彦, 林靖彦

    応用物理学会春季学術講演会講演予稿集(CD-ROM)   65th   2018

  • Direct observation of band bending structure on ferroelectric BaTiO3

    Oshime N, Kano J, Ikenaga E, Yasui S, Hinokuma S, Ikeda N, Yokoya T, Fujii T

    Meeting Abstracts of the Physical Society of Japan   72 ( 0 )   2725 - 2725   2017

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    &lt;p&gt;自発分極は試料内部の静電ポテンシャルを傾斜させる。強誘電体の原子軌道エネルギーはこの傾斜に応じて系統的に変化すると考えられる。この現象はバンドベンディングと呼ばれ40年以上に渡り予想されてきた。今回,BaTiO_3_においてバンドベンディング現象を直接的に観測したので報告する。本研究において得られた実験結果は,エピタキシャル製膜された強誘電体薄膜試料と深さ分解光電子分光実験を組み合わせることで初めて達成できた。&lt;/p&gt;

    DOI: 10.11316/jpsgaiyo.72.1.0_2725

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  • 純核ブラッグ散乱によるFe3BO6の磁気構造の検証

    中村真一, 三井隆也, 藤原孝将, 池田直, 下村晋, 黒葛真行

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   2017

  • BaTiO3のバンドベンディング構造

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   78th   2017

  • 分極効果で変調される強誘電体BaTiO3の電子構造

    押目典宏, 狩野旬, 狩野旬, 池永英司, 安井伸太郎, 日隈聡士, 池田直, 浜嵜容丞, 安原颯, 横谷尚睦, 伊藤満, 藤井達生, 保井晃

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   2017

  • 鉄欠損を制御したYbFe2O4の電荷秩序と磁気・誘電特性

    藤原孝将, 烏谷友之, 古林宏之, 福永守, 狩野旬, 狩野旬, DISSANAYAKE Sachith, 松田雅昌, FERNANDEZ-BACA Jaime, 中島多朗, 加倉井和久, 加倉井和久, 三井隆也, 中村真一, 池田直

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   2016

  • Fe 3p-3d resonant inverse photoemission spectroscopy on YbFe2O4

    Fukura T., Wakita T., Fujiwara K., Terashima K., Sato H., Namatame H., Taniguchi M., Ikeda N., Muraoka Y., Yokoya T.

    Meeting Abstracts of the Physical Society of Japan   71   2527 - 2527   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_2527

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  • 放射光を用いたFe3O4のメスバウアー回折実験

    中村真一, 三井隆也, 藤原孝将, 池田直, 下村晋, 黒葛真行

    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   2016

  • Mnをドープした(YbFe2O4)m(YbFeO3)n,m=1,n=1単結晶の磁性と誘電特性

    烏谷友之, 藤原孝将, 藤井達生, 戸取和大, 古林宏之, 福永守, 堀部陽一, 狩野旬, 狩野旬, 池田直

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   2016

  • 化学当量性の良いYbFe2O4の電荷秩序と誘電性 1

    藤原孝将, 宮島瑞樹, 烏谷友之, 福永守, 古林宏之, 永田知子, 狩野旬, 狩野旬, 池田直

    日本物理学会講演概要集(CD-ROM)   70 ( 2 )   2015

  • 走査型放射光顕微鏡で見る強相関電子系物質のドメイン構造

    竹下聡史, 大隅寛幸, 有馬孝尚, 有馬孝尚, 高田昌樹, 高田昌樹, 赤浜裕士, 神戸高志, 狩野旬, 永田知子, 池田直, 湯本博勝, 小山貴久, 大橋治彦, 大橋治彦

    日本放射光学会年会・放射光科学合同シンポジウム予稿集   25th   2012

  • 22pGK-8 Electrical conduction mechanism of electronic ferroelectric RFe_2O_4

    Nagata T., Fukada Y., Akahama H., Funae T., Okazaki H., Yokoya T., Kambe T., Kano J, Ikeda N.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   542 - 542   2011.8

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  • 22pGK-6 Dielectric properties of LuFe_2O_4 under magnetic fields

    Fukada Y., Kambe T., Nagata T., Kano J., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   542 - 542   2011.8

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  • 22pGK-5 Calorimetric Property of Stacked Triangular Mixes Iron Valence Oxide LuFe_2O_4

    Kano J., Kambe T., Fukada Y., Nagata T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   541 - 541   2011.8

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  • 21aTC-2 層状鉄酸化物LuFe_2O_4における電荷秩序の光融解(21aTC 光誘起相転移(酸化物・シアノ錯体),領域5(光物性))

    伊藤 弘毅, 伊藤 桂介, 安生 皓平, 岩井 伸一郎, 石原 純夫, 齋藤 伸吾, 赤浜 裕士, 大石 大輔, 神戸 高志, 池田 直

    日本物理学会講演概要集   66 ( 2 )   715 - 715   2011.8

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  • 22pGK-4 Fluctuation of frustrated charge in LuFe_2O_4 observed by resonant inelastic x-ray scattering

    Ishii K., Yoshida M., Jarrige I., Mizuki J., Naka M., Ishihara S., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   541 - 541   2011.8

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  • 22pGK-7 SR X-ray magnetic diffraction study on LuFe_2O_4 II

    Ohsumi H., Takeshita S., Arima T., Takata M., Akahama H., Kambe T., Kano J, Nagata T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   542 - 542   2011.8

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  • 21pPSB-13 Temperature dependence of optical reflection spectrum in multiferroic material LuFe_2O_4

    Go T., Oohata G., Mori S., Ikeda N., Mizoguchi K.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   738 - 738   2011.8

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  • 23aPS-131 Low Frequency Micro-Raman Scattering in LuFe_2O_4

    Mitsumura T., Takesada M., Fukada Y., Nagata N., Kano J., Ikeda N., Onodera A.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   1005 - 1005   2011.8

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  • 26aPS-107 Mn-doping effect on charge ordering structure in YbFe_2O_4

    Matsumoto K., Yoshii K., Kano S., Hanasaki T., Kanbe T., Ikeda N., Mori S.

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   968 - 968   2011.3

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  • 25pEF-10 SR X-ray magnetic diffraction study on LuFe_4O_4

    Ohsumi H., Takeshita S., Arima T., Takata M., Akahama H., Kambe T., Kano J., Nagata T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   561 - 561   2011.3

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  • 26aPS-118 Low Frequency Light Scattering in LuFe_2O_4

    Mitsumura T., Takesada M., Akahama Y., Kambe T., Kano J., Nagata T., Ikeda N., Onodera A.

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   971 - 971   2011.3

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  • 27pHB-13 層状鉄酸化物LuFe_2O_4の超高速テラヘルツ応答II(27pHB 領域5,領域10合同 光誘起相転移(酸化物,誘電体),領域5(光物性))

    伊藤 弘毅, 伊藤 桂介, 安生 皓平, 中屋 秀貴, 岩井 伸一郎, 石原 純夫, 齋藤 伸吾, 赤浜 裕士, 早川 弘毅, 大石 大輔, 神戸 高志, 池田 直

    日本物理学会講演概要集   66 ( 1 )   791 - 791   2011.3

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  • 25pEF-11 Charge Order Domain of LuFe_2O_4 Probed by Focused SR X-ray

    Takeshita S., Ohsumi H., Arima T., Takata M., Akahama H., Kambe T., Kano J., Nagata T., Ikeda N., Yumoto H., Koyama T., Ohashi H.

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   561 - 561   2011.3

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  • 27pTM-8 Giant SHG signals of hexagonal YbFeO_3 thin film observed in low temperature

    Iida Hayato, Uesu Yoshiaki, Kohn Keiichi, Ikeda Naoshi, Mori Shigeo, Haumont R., Kiat J. M.

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   983 - 983   2011.3

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  • 23pRC-10 層状鉄酸化物LuFe_2O_4の超高速テラヘルツ応答(23pRC 光誘起相転移(酸化物,誘電体),領域5(光物性))

    伊藤 弘毅, 伊藤 桂介, 中屋 秀貴, 安生 皓平, 岩井 伸一郎, 石原 純夫, 斎藤 伸吾, 赤浜 裕士, 早川 弘毅, 大石 大輔, 神戸 高志, 池田 直

    日本物理学会講演概要集   65 ( 2 )   677 - 677   2010.8

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  • 24aWJ-8 Electronic Structure of YbFe_2O_4 Studied by Soft X-ray Photoemission Spectroscopy

    Okazaki H., Fukui M., Muro T., Wakita T., Muraoka Y., Hirai M., Akahama H., Ikeda N., Yokoya T.

    Meeting abstracts of the Physical Society of Japan   65 ( 2 )   550 - 550   2010.8

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  • 24aPS-129 Magnetic/dielectric properties and charge ordering phenomenain YbFe_<2-x>Mn_xO_4

    Matsumeto K., Hoshiyama T., Ohishi D., Akahama H., Yoshii K., Kano S., Hanasaki T., Kanbe T., Ikeda N., Mori S.

    Meeting abstracts of the Physical Society of Japan   65 ( 2 )   902 - 902   2010.8

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  • 24aPS-128 Terahertz Dielectric Dispersion of Electronic Ferroelectric LuFe_2O_4 Crystals

    Kano J., Kitahara H., Hangyo M., Fujii Y., Akahama H., Ohishi D., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   65 ( 2 )   901 - 901   2010.8

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  • 20aGF-9 Magnetic Properties and Electronic Properties of LuGaFeO_4

    Kuroda T., Fukuyama R., Kitamura S., Funae T., Matsuo Y., Ikeda N., Kambe T., Agui A., Kimizuka N.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   533 - 533   2010.3

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  • 20aPS-94 Magnetic and dielectric properties of Lu_2Fe_3O_7

    Fukuyama Ryota, Yoshii Kenji, Kuroda Tomoko, Kitamura Satoshi, Funae Takeshi, Matsuo Yoji, Ikeda Naoshi, Kambe Takashi, Kimizuka Noboru

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   542 - 542   2010.3

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  • 21aGR-13 Physical properties and structure of Ca-doped picene

    Lee X., Mitamura Y., Yamanari Y., Kanbe K., Ikeda N., Fujiwara A., Kubozono Y.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   871 - 871   2010.3

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  • 21pGT-1 Polar Charge Ordering of Triangular Iron Mixed Valence System RFe_2O_4

    Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   636 - 636   2010.3

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  • 21aGR-12 Physical properties and structure of Rb, Cs and Na-doped picene

    Mitamura Hiroki, Lee Xuesong, Yamanari Yusuke, Kambe Takashi, Ikeda Naoshi, Fujiwara Akihiko, Kubozono Yoshihiro

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   871 - 871   2010.3

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  • 20aGF-10 Successive Charge Order Phase Transition of YFe_2O_4

    Maeda Daisuke, Fukuyama Ryota, Kitamura Satoshi, Matsuo Yoji, Ikeda Naoshi, Kambe Takashi, Kimizuka Noboru, Yoshii Kenji, Mori Shigeo

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   534 - 534   2010.3

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  • 20aGF-11 Electric field response of the charge ordering in layered triangular lattice compound LuFe_2O_4

    Hayakawa Hironori, Kubota Masato, Oishi Daisuke, Akahama Hiroshi, Matsuo Yoji, Ikeda Naoshi, Kambe Takashi, Kimizuka Noboru, Yoshii Kennji

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   534 - 534   2010.3

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  • 20aPS-90 semiconducting properties of iron oxiside compounds/transition metal oxide system

    Nagata T., Kuroda T., Fukuyama R., Kitamura S., Funae T., Matsuo Y., Ikeda N., Kambe T., Kimizuka N., Paku J., Akedo J.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   541 - 541   2010.3

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  • 20aPS-93 Multiferroic character and magnetic phase diagram in LuFe_2O_4

    Oishi D., Hayakawa H., Akahama H., Ikeda N., Kambe T., Matsuo Y., Kimizuka N., Yoshii K.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   541 - 541   2010.3

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  • 23aGR-7 Control of device performance of phthalocyanine/fullerene based solar cell

    Kawai N., Hamao S., Takahashi Y., Komura N., Kambe T., Ikeda N., Kubozono Y.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   911 - 911   2010.3

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  • 20aGR-7 Structure and physical properties of (CH_3NH_2A)_xC_<60>

    Suzuki Y., Yamanari Y., Kato K., Takahashi Y., Kubozono Y., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   851 - 851   2010.3

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  • 22pGS-9 N-channel characteristics of picene thin film field-effect transistors

    Kawasaki N., Kaji Y., Komura N., Okamoto H., Kambe T., Ikeda N., Kubozono Y., Fujiwara A.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   901 - 901   2010.3

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  • 21pGT-1 Polar Charge Ordering of Triangular Iron Mixed Valence System RFe_2O_4

    Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   891 - 891   2010.3

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  • 23pHS-4 Structural Characterization and Dielectric Magnetic Properties of Hexagonal R(Fe,Ti)O_3 (R=Yb,Lu)

    Hoshiyama T., Matsuo Y., Mori S., Michiue Y., Brown F., Kimizuka N., Kambe T., Ikeda N., Yoshii K.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   1014 - 1014   2010.3

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  • 20aHK-3 層状鉄酸化物LuFe_2O_4のテラヘルツ分光(20aHK 光誘起相転移(酸化物系),領域5(光物性))

    伊藤 弘毅, 伊藤 桂介, 中屋 秀貴, 岩井 伸一郎, 石原 純夫, 斎藤 伸吾, 赤浜 裕士, 早川 弘毅, 大石 大輔, 神戸 高志, 池田 直

    日本物理学会講演概要集   65 ( 1 )   729 - 729   2010.3

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  • 21aPS-93 Magnetic/dielectric properties and charge ordering phenomenain YbFe_<2-x>Mn_xO_4

    Matsumoto K., Matsuo Y., Ohishi D., Akahama H., Yoshii K., Ikeda T., Hanasaki T., Kanbe N., Kimizuka N., Mori S.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   986 - 986   2010.3

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  • 23aGV-8 Thin film stabilized multi-ferroic hexagonal YbFeO_3

    Uesu Y., Iida H., Koizumi T., Ikeda N., Kohn K., Haumont R., Kiat J. M.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   1008 - 1008   2010.3

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  • 28aYD-2 Superconductivity of K_xpicene

    Yamanari Y., Mitamura H., Suzuki Y., Kubozono Y., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   788 - 788   2009.8

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  • 27aYD-1 Carrier transport in heterojunction devices of C_<60>/picene and PCBH/picene

    Kawai N., Nagata T., Hamao S., Takahashi Y., Okamoto H., Takaguchi Y., Kubozono Y., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   769 - 769   2009.8

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  • 28aYD-1 Superconductivity in Rb_xpicene

    Mitamura Hiroki, Yamanari Yusuke, Suzuki Yuta, Kubozono Yoshihiro, Kambe Takashi, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   787 - 787   2009.8

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  • 27pYD-11 p-n properties of iron oxiside compounds/C60 system

    Nagata T., Hamao S., Takahashi Y., Maeda D., Kawai N., Sasaka H., Kubozono Y., Akedo J., Paku J., Fujii T., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   780 - 780   2009.8

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  • 28pYD-5 Superconductivity of Cs_3C_<60>

    Suzuki Y., Yamanari Y., Mitamura H., Kubozono Y., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   795 - 795   2009.8

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  • 28pRL-8 Study of charge ordering in LuFe204 by X-ray diffraction measurement

    Kubota M., Hayakawa H., Ohoishi D., Akahama Y., Yoshii K., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   572 - 572   2009.8

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  • 28pRL-9 三角格子系物質LuFeMO_4(M=Co,Cu)における局所構造(マルチフェロイクス3,領域8,強相関系:高温超伝導,強相関f電子系など)

    松尾 祥史, 森 茂生, 吉井 賢資, 早川 弘毅, 池田 直

    日本物理学会講演概要集   64 ( 2 )   572 - 572   2009.8

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  • 29pYG-11 Formation of C_<60>/picene pn-heterojunction and its photoirradiation effect

    Kawai N., Kubozono Y., Mitsuhashi R., Lee X., Kawasaki N., Kuroda T., Nagata E., Yamanari Y., Suzuki Y., Maeda D., Hayakawa K., Kanbe T., Ikeda N., Fujiwara A.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   644 - 644   2009.3

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  • 27pTD-13 Fe 3p→1s X-ray Resonant Emission Spectroscopy of LuFe_2O_4 single crystal

    Agui Akane, Mizumaki Masaichiro, Kawamura Naomi, Kuroda Tomoko, Hayakawa Hironori, Maeda Daisuke, Michiuchi Takamasa, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   561 - 561   2009.3

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  • 28aPS-49 Dielectric response under magnetic field in LuFe_2O_4

    Komatsu T., Kambe T., Michiuchi Y., Hayakawa H., Ohishi D., Hanasaki N., Ikeda N., Yoshii K.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   607 - 607   2009.3

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  • 29pYG-11 Formation of C_<60>/picene pn-heterojunction and its photoirradiation effect

    Kawai N., Kubozono Y., Mitsuhashi R., Lee X., Kawasaki N., Kuroda T., Nagata E., Yamanari Y., Suzuki Y., Maeda D., Hayakawa K., Kanbe T., Ikeda N., Fujiwara A.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   848 - 848   2009.3

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  • 29pYG-6 Superconductivity of alkaline doped aromatic hydrocarbon

    Mitsuhashi R., Kubozono Y., Kawasaki N., Kambe T., Ikeda N., Okamoto H., Yamanari Y., Suzuki Y., Fujiwara A., Maniwa Y.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   847 - 847   2009.3

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  • 30aYF-2 LT CO Structure in θ-(BEDT-TTF)_2MZn(SCN)_4 (M=Cs,Rb)

    Nogami Y., Yamamoto K., Kakinuma M., Ogura M., Yokota K., Hanasaki N., Ikeda N., Kambe T., Chou U., Magari N., Tateishi T., Watanabe M., Osanai M., Noda Y., Terasaki I., Inada T., Onishi Y., Ito T., Toyokawa H., Ohsumi H., Mori H., Mori T.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   853 - 853   2009.3

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  • 29pYG-6 Superconductivity of alkaline doped aromatic hydrocarbon

    Mitsuhashi R., Kubozono Y., Kawasaki N., Kambe T., Ikeda N., Okamoto H., Yamanari Y., Suzuki Y., Fujiwara A., Maniwa Y.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   643 - 643   2009.3

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  • 29pRF-3 Syntheses of new multiferroic hexagonal YbFeO_3 thin film and its physical property

    Iida Hayato, Koizumi Tatsurou, Uesu Yoshiaki, Kohn Kay, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   965 - 965   2009.3

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  • 20aYE-3 Relaxation of structural frustration in NbSe_3 topological crystals

    Tsuneta T., Yamamoto K., Ikeda N., Nogami Y., Tanda S.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   689 - 689   2008.8

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  • 22pVE-9 Local structural change of CaCu_3Ti_4O_<12> in low temperature phase

    YONEDA Yasuhiro, YOSHII Kenji, Hayakawa Hironori, Aoyagi Rintaro, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   890 - 890   2008.8

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  • 22pTC-6 Lattice modulation and competing charge-order in θ-(BEDT-TTF)_2RbZn(SCN)_4 in quenched nonlinear-conducting state

    Watanabe M., Yamamoto K., Kakinuma M., Nogami Y., Hanasaki T., Ikeda N., Kambe T., Yokota K., Ito T., Toyokawa H., Ohsumi H., Osanai M., Noda Y., Inada T., Terasaki I., Mori H., Mori T.

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   775 - 775   2008.8

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  • 20aQA-11 Magnetic and dielectric properties of electronic ferroelectric RFe_2O_4 and related oxides (R: rare earths)

    Yoshii Kenji, Ikeda Naoshi, Okajima Yuka, Yoneda Yasuhiro, Matsuo Yoji, Horibe Yoichi, Mori Shigeo

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   436 - 436   2008.8

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  • 20pPSA-1 Oxygen annealing effect on magnetic and dielectric properties in LuFeCuO_4

    Meeting abstracts of the Physical Society of Japan   63 ( 2 )   459 - 459   2008.8

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  • 24aWK-2 Magnetic ground state in the ferrielectric LuFe_2O_4

    Kakurai K., Matsuda M., Yoshii K., Ikeda N., Kito H., Yamada Y.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   471 - 471   2008.2

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  • 23aTF-10 Diffuse streak in phthalocyanine-molecular conductor TPP[Fe(Pc)(CN)_2]_2

    Hanasaki N., Tanabe M., Nogami Y., Ikeda N., Matsuda M., Tajima H., Takigawa M., Inabe T.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   796 - 796   2008.2

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  • 23aWA-4 Field-induced discommensuration in o-TaS_3

    Inagaki Katsuhiko, Tsubota Masakatsu, Higashiyama Kazuki, Ichimura Koichi, Tanda Satoshi, Yamamoto Kenichiro, Hanasaki Noriaki, Ikeda Naoshi, Nogami Yoshio, Ito Takayoshi, Toyokawa Hidenori

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   753 - 753   2008.2

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  • 24aPS-36 Magnetic and dielectric properties of R_<0.5>Ca_<0.5>MnO_3(R: rare earths)

    Yoshii Kenji, Hiramitsu Yusuke, Okajima Yuka, Yoneda Yasuhiro, Nihsihata Yasuo, Mizuki Jun'ichiro, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   579 - 579   2008.2

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  • 24aPS-88 Electronic Properties of R_<1-x>M_xFe_2O_4

    Kuroda T., Naito N., Michiuchi T., Yokota Y., Yamamoto K., Hanasaki N., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   591 - 591   2008.2

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  • 24pTF-1 Modulated structure of θ-(BEDT-TTF)_2RbZn(SCN)_4 in the quenching phase

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   818 - 818   2008.2

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  • Education and Training Program for Graduate School Student with Synchrotron Radiation Facility

    HARADA Isao, IKEDA Naoshi, YOKOYA Takayoshi

    21 ( 1 )   20 - 25   2008.1

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  • 21aRA-6 X-ray diffraction experiment for θ-(BEDT-TTF)2CsZn(SCN)4 using the time-resolved 2D-detector under electric current pulse

    Watanabe Masashi, Yamamoto Kenichiro, Ito Takayoshi, Hanasaki Noriaki, Ikeda Naoshi, Nogami Yoshio, Toyokawa Hidenori, Ohsumi Hiroyuki, Noda Yukio, Suko Tomohiro, Terasaki Ichiro, Mori Hatsumi, Mori Takehiko

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   844 - 844   2007.8

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  • 24aTE-8 Electric Field Response of RFe_2O_4

    Ikeda N., Yokota Y., Michiuchi T., Mori S., Matsuo Y., Yoshii K.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   1016 - 1016   2007.8

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  • 24aWH-7 Electronic Structure of 3d in Fe^<2+> and Fe^<3+> of LuFe_2O_4

    Agui Akane, Ikeda Naoshi, Morimoto Masanori, Uozumi Takayuki, Kaamber Tanle

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   652 - 652   2007.8

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  • 22pPSB-43 Structural phase transition and charge ordering in RFe_2O_4

    Matsuo Y., Shinohara S., Mori S., Yoshii K., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   618 - 618   2007.8

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  • 21aRA-7 Current-density dependent energy gap in θ-(BEDT-TTF)_2CsM(SCN)_4

    Terasaki I., Sawano F., Suko T., Tasaki S., Mori H., Mori T., Nogami Y., Ikeda N., Watanabe M., Noda Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   844 - 844   2007.8

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  • 18pRD-12 Strain Analysis of TaSe_3 Topological Crystals by Synchrotron X-ray Diffraction Measurements

    Yamamoto K., Ito T., Ikeda N., Nogami Y., Horita S., Matsuura T., Tanda S., Tsuneta T.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   769 - 769   2007.2

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  • 19pRJ-6 Low Temperature Structure of TMTTF_2X

    Nogami Yoshio, Ito Takayoshi, Nakashima Yusaku, Yamamoto Kenichiro, Ikeda Naoshi, Nakamura Toshikazu

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   835 - 835   2007.2

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  • 21pRA-2 Giant lattice variation in θ-(BEDT-TTF)_2CsZn(SCN)_4 in nonlinear conducting state

    Watanabe Masashi, Yamamoto Kenichiro, Nakashima Yusaku, Ito Takayoshi, Tanabe Makoto, Hanasaki Noriaki, Ikeda Naoshi, Nogami Yoshio, Osumi Hiroyuki, Toyokawa Hidenori, Noda Yukio, Terasaki Ichiro, Sawano Fumiaki, Suko Tomohiro, Mori Hatsumi, Mori Takehiko

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   863 - 863   2007.2

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  • 19pWK-7 Frustration and Ordering in Spin, Charge and Orbital in RFe_2O_4

    Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   595 - 595   2007.2

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  • 19aPS-91 Structural phase transition and charge ordering in YFe_2O_4

    Shinohara S., Matsuo Y., Mori S., Horibe Y., Yoshii K., Ikeda N., Imamura K., Fujimura N.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   577 - 577   2007.2

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  • 20pTB-5 Magnetic ordering process in the layered triangular latticesy stem LuFe_2O_4 in applied field

    Kakurai K., Matsuda M., Yoshii K., Ikeda N., Ishii Y., Kito H., Yamada Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   475 - 475   2007.2

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  • 電荷秩序型強誘電体YFe2O4-xの電気伝導特性

    吉村武, 今村謙, 堀部陽一, 藤村紀文, 森茂生, 池田直

    日本セラミックス協会秋季シンポジウム講演予稿集   20th   2007

  • 25pYF-4 Lattice variation of θ-(BEDT-TTF)_2CsZn(SCN)_4 in nonlinear conducting state

    Watanabe Masashi, Ito Takayoshi, Yamamoto Kenichiro, Nakashima Yusaku, Hanasaki Noriaki, Ikeda Naoshi, Nogami Yoshio, Osumi Hiroyuki, Toyokawa Hidenori, Noda Yukio, Terasaki Ichiro, Sawano Fumiaki, Suko Tomohiro, Mori Hatsumi, Mori Takehiko

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   698 - 698   2006.8

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  • 24aWA-4 International Physics Olympiad and Physics Challenge IV : Report on Physics Challenge 2006 in Okayama

    Harada I., Ikeda N., Sakuda M., Mino M., Ninomiya M., Ariyama M., Namiki M., Kitahara K.

    Meeting abstracts of the Physical Society of Japan   61 ( 2 )   300 - 300   2006.8

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  • 30aRB-11 Low-temperature structure of M_2P-TCNQF_4

    Ito T., Yamamoto K., Ikeda N., Nogami Y., Matsuzaki H., Okamoto H.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   847 - 847   2006.3

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  • 27aPS-87 Doping effect on charge ordering in triangular-lattice compound LuFe_2O_4

    Matsuo Y., Horibe Y., Mori S., Yoshii K., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   540 - 540   2006.3

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  • 28aXD-2 Structure of lattice modulation in RMn_2O_5 characterized by magnetism and ferroelectricity

    Noda Y., Kimura H., Kamada Y., Ishikawa Y., Kobayashi S., Wakabayashi Y., Ikeda N., Kohn K.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   931 - 931   2006.3

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  • 27pTE-6 Development of X-ray and neutron transparent pulse magnets

    Ohmichi E., Ikeda N., Nogami Y., Osada T.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   434 - 434   2006.3

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  • 27pRB-7 Time resolved X-ray diffraction study for θ-(BEDT-TTF)_2CsM'(SCN)_4 under pulse electric current at low temperature

    Watanabe Masashi, Ito Takayoshi, Ikeda Naoshi, Yamamoto Kenichiro, Toyokawa Hidenori, Nakashima Yusaku, Horita Shintaro, Nogami Yoshio, Noda Yukio, Terasaki Ichiro, Sawano Fumiaki, Mori Hatsumi, Mori Takehiko

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   810 - 810   2006.3

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  • 27pXF-6 CDW Satellite Reflection Measurement of NbSe_3 Ring Crystal

    Yamamoto K., Ito T., Ikeda N., Nogami Y., Horita S., Matsuura T., Tanda S., Tsuneta T.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   772 - 772   2006.3

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  • 30pUE-11 Development of Low Temperature Diffuse Scattering Camera in High Magnetic Field

    Horita S., Ito T., Irie N., Ikeda N., Nogami Y., Nagao N., kanbe T., Oshima K., Isobe M., Ueda Y.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   657 - 657   2006.3

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  • 28aRB-1 Crystal and modulation structures of α-(BEDT-TTF)_2MHg(SCN)_4

    Irie N., Ito T., Yamamoto K., Ikeda N., Nogami Y., Mori H.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   819 - 819   2006.3

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  • 共鳴X線散乱で見つけた強誘電体

    池田直

    日本放射光学会誌   19, 15   2006

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  • 有機サイリスタ「直流を交流に変化する有機単結晶」を発見

    寺崎一郎, 池田直

    SPring-8 Information   11, 17-21   2006

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  • 電荷秩序型強誘電体YFe2O4-δの電気伝導特性

    今村謙, 堀部陽一, 吉村武, 藤村紀文, 森茂生, 池田直

    応用物理学会学術講演会講演予稿集   67th ( 1 )   2006

  • YFe2O4-δの電気的・磁気的特性における酸素欠損の影響

    今村謙, 堀部陽一, 吉村武, 藤村紀文, 森茂生, 池田直

    応用物理学関係連合講演会講演予稿集   53rd ( 1 )   2006

  • 19pWB-10 Change in modulated structure of θ-(BEDT-TTF)_2CsM'(SCN)_4 under DC current.

    Watanabe M., Ito T., Yamamoto Y., Ikeda N., Nogami Y., Noda Y., Terasaki I., Mori H., Mori T.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   678 - 678   2005.8

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  • 29aPS-74 Structural Study on Charge Ordering in Fe_2BO_4 by X-ray Powder Diffraction

    Shimomura S., Kaneko E., Nakamura S., Ikeda N., Katoh K., Kohn K.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   443 - 443   2005.8

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  • 19pPSA-39 Doping effect on charge ordering in triangular-lattice compound RFe_2O_4(R=Lu, Yb)

    Matsuo Y., Horibe Y., Mori S., Yoshii K., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   402 - 402   2005.8

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  • 19aYP-4 Physical properties and structural changes in mixed perovskite (1-x)BiFeO_3-xBaTiO_3

    Horibe Y., Nakayama M., Hosokoshi Y., Mori S., Asada T., Koyama Y., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   60 ( 2 )   800 - 800   2005.8

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  • 27pYR-3 X-ray diffraction study near α-INC phase transition in SiO_2(Quartz)

    Ohike Y., Toyonaga M., Abe K., Shigenari T., Ikeda N., Mizumaki M.

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   933 - 933   2005.3

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  • 27pWE-3 Structural Study of Eu_<0.6>Sr_<0.4>MnO_3 Perovskite under Magnetic Field

    Ito T., Ikeda N., Nakamura S., Shimomura S., Nogami Y., Mukovskii Yakov M.

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   614 - 614   2005.3

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  • 25aYN-7 X-ray diffraction study for θ-(BEDT-TTF)_2CsM'(SCN)_4 under electric field at low temperature.

    Watanabe Masashi, Ikeda Naoshi, Ito Takayoshi, Nogami Yoshio, Komiyama Satoshi, Noda Yukio, Terasaki Ichiro, Mori Hatsumi, Mori Takehiko

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   791 - 791   2005.3

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  • 24aYK-6 Low temperature structures in (TMTTF)_2X5

    Nogami Y., Ito T., Ikeda N., Nakamura T.

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   768 - 768   2005.3

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  • 24aYR-11 Magnetism, Ferroelectricity and Lattice modulation of RMn_2O_5

    Noda Y., Kobayashi S., Kimura H., Kamada Y., Kadoshita K., Kohn K., Ikeda N., Wakabayashi Y.

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   891 - 891   2005.3

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  • 24pXN-6 Electric magnetic effect of RFe_2O_4 single crystal

    Konisi S., Ikeda N., Oka K., Eisaki H., Arima T.

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   417 - 417   2005.3

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  • 25pXL-4Approach to Structure Analysis of NbSe_3 topological crystal

    Yamamoto K., Tsuneta T., Tanda S., Ikeda N., Nogami Y., Ito T., Irie N.

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   742 - 742   2005.3

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  • 24aYR-10 Magnetic and Electric Field Response of RFe_2O_4

    Ikeda Naoshi, Yoshii Kenji, Mori Shigeo

    Meeting abstracts of the Physical Society of Japan   60 ( 1 )   891 - 891   2005.3

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  • 13aRB-7 Structural aspects of C_0 phase of NaV_2O_5

    Ohwada K, Fujii Y, Noda Y, Nakao H, Murakami Y, Ohsumi H, Ikeda N, Sawa H, Isobe M, Ueda Y

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   449 - 449   2004.8

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  • 13aTL-11 Lattice distortion in TbMn_2O_5 associated with simultaneous ferroelectric and magnetic phase transitions

    Kobayashi S., Kimura H., Kadoshita K., Noda Y., Kohn K., Ikeda N., Wakabayashi Y.

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   862 - 862   2004.8

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  • 14pRA-4 Magnetic and Charge Ordering of RFe_2O_4

    Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   530 - 530   2004.8

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  • 13pRB-10 Charge ordering of strongly correlated spinel AlV_2O_4 (I) : Structural teatures

    Horibe Y, Kurushima K, Ishibashi H, Mori S, Ikeda N, Shingu M, Katsufuji T

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   494 - 494   2004.8

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  • 13pRB-13 Successive Phase Transition of YFe_2O_4

    Ikeda N., Kishimoto K, Horibe Y., Matsuo Y., Mori S

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   495 - 495   2004.8

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  • 14pRA-4 Magnetic and Charge Ordering of RFe_2O_4

    Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   875 - 875   2004.8

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  • 28aPS-64 Composition of the mixed-valence system YFe_2O_4

    Kishimoto K, Ikeda N, Horibe Y, Mori S

    Meeting abstracts of the Physical Society of Japan   59 ( 1 )   570 - 570   2004.3

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  • 27pYD-6 Twisting number dependence of the cbarge-density-wave transition in NbSe_3 topological materials

    Tsuneta T., Matsuura T., Tanda S., Nogami Y., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   59 ( 1 )   801 - 801   2004.3

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  • Orbitally Ordered State in Y_<1-x>Ca_xTiO_3 Studied by Resonant X-ray Scattering

    Kodama S, Nakao H, Murakami Y, Tsubota M, Iga F, Uchihira K, Kura S, 竹村 征樹, Takabatake T, Ohsumi H, Mizumaki M, Ikeda N

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   541 - 541   2003.8

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  • Structural Phase Transition in LuFe_2O_4

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   527 - 527   2003.8

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  • Structure Analysis of NbSe_3 topological crystal 1

    Nogami Y., Tanda S., Tsuneta T., Kambe T., Fujiwara M., Oshima K., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   687 - 687   2003.8

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  • Low temperature structures in (TMTTF)_2X 4

    Nogami Y., Kambe T., Fujiwara M., Oshima K., Nagao N., Nakamura T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   756 - 756   2003.8

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  • On the Charge Ordering Domain of on LuFe_2O_4

    Ikeda N., Kishimoto K., Horibe Y., Mori S., Ohsumi H.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   869 - 869   2003.8

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  • In-chain atomic arrangement in quasi one-dimensional MMX, chain complexes [Pt_2(dta, dtp)_4]I

    Wakabayashi Y., Sawa H., Kobayashi A., Ohsumi H., Ikeda N., Kitagawa H., Ikeda R.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   763 - 763   2003.8

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  • Order of Fe and Mo in double perovskite, Sr_2FeMoO_6

    Kuzushita K., Morimoto S., Mizumaki M., Ikeda N., Nasu S., Sarma D.D., Ray S., Takano M.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   533 - 533   2003.8

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  • Ordering process of charge stripe correlations and structural phase transitions in La_<1.875-x>Ba_<0.125-x>Sr_xCuO_4

    Kimura H., Shiratori E., Goka H., Fujita M., Noda Y., Yamada K., Mizumaki M., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   435 - 435   2003.8

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  • Spin ordering process in LuFe_2O_4 (3)

    Nagai S., Nishi M., Hirota K., Nakajima K., Kakurai K., Matsuda M., Ishii Y., Kito H., Ikeda N., Yamada Y.

    Meeting abstracts of the Physical Society of Japan   58 ( 2 )   408 - 408   2003.8

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  • Possible structural phase transition in Eu_<0.6>Sr_<0.4>MnO_3 on the magnetic field induced MI transition

    Nakamura S., Shimomura S., Ikeda N., Mizumaki M., Ohsumi H., Nimori S., Takeuchi T., Itoh K.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   502 - 502   2003.3

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  • Observation of Charge Ordering on LuFe_2O_4 by Resonant X-ray Scattering

    Ikeda N., Mizumaki M., Ohsumi H.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   504 - 504   2003.3

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  • X-ray Diffraction Study of Phase Transition in (C_2H_5NH_3)_2CuCl_4 at 4GPa

    Ohwada K., Inami T., Ishii K., Murakami Y., Ikeda N., Ohsumi H., Ohishi Y., Shimomura O.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   422 - 422   2003.3

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  • High-energy X-ray scattering study of charge stripe order in La_<2-x-y>Ba_ySr_xCuO_4(x+y=1/8) II

    Kimura H., Shiratori E., Goka H., Fujita M., Noda Y., Yamada K., Mizumaki M., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   495 - 495   2003.3

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  • 28aPS-66 RFe_2O_4 (R=Y, Lu) における構造相転移のその場観察

    堀部 陽一, 岸本 和也, 森 茂生, 池田 直, 今藤 優一, 近桂 一郎

    日本物理学会講演概要集   58 ( 1 )   507 - 507   2003.3

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  • Nonresonant x-ray diffraction from the orbitaily ordered phase of DyB_2C_2

    Adachi H., Kawata H., Mizumaki M., Akao T., Sato M., Ikeda N., Tanaka Y., Miwa H.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   601 - 601   2003.3

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  • Relaxor-like behavior of λ-(BETS)_2FeCl_4

    Komiyama S., Watanbe M., Kiyanagi R., Noda Y., Ikeda N., Negishi E., Toyota N.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   797 - 797   2003.3

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  • Low temperature structures in (TMTTF)_2X 3

    Nogami Y., Kambe T., Nagao N., Fujiwara M., Oshima K., Nakamura T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   58 ( 1 )   790 - 790   2003.3

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  • Powder diffraction of two dimensional hydrogen-bonded material Squaric-acid under high pressure

    Naoshi Ikeda, H. Ohsumi, Yukio Noda, Hiroyuki Kimura, Masashi Watanabe, Z. L. Xian, Y. Kuroiwa

    SPring-8 User Experiment Report   8   72 - 72   2002.4

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  • Crystal structure analysis of the low-temperature phase of BaVS3 using a vacuum camera

    Toshiya Inami, Masashi Watanabe, Hiroyuki Kimura, Hiroyuki Nakamura, Kenji Ohwada, Yukio Noda, Naoshi Ikeda, Yoichi Murakami, Y. Ozawa, Koshiro Toriumi

    SPring-8 User Experiment Report   8   18 - 18   2002

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  • Instrumenttaional development of BL02B1

    N. Ikeda, H. Ohsumi, Y. Noda, H. Kimura, M. Watanabe, Z. L. Xian, Y. Kuroiwa

    SPring-8 User Experiment Report   8   21 - 21   2002

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  • Structural phase transition of BaVS_3 at T_<MI>

    Inami T., Kimura H., Nakamura H., Ohwada K., Noda Y., Yamasaki T., Shiga M., Ikeda N., Murakami Y.

    Meeting abstracts of the Physical Society of Japan   56 ( 2 )   358 - 358   2001.9

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  • The construction and the present condition of BL46XU

    Mizumaki Masaichiro, Ikeda Naoshi, Akao Takahiro, Ohsumi Hiroyuki, Suematsu Hiroyoshi

    Meeting abstracts of the Physical Society of Japan   56 ( 2 )   811 - 811   2001.9

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  • Structure and Physical Properties in Low Temperature YFe_2O_4

    Ikeda Naoshi, Mori Ryosuke, Kohn Kay, Takano Yoshiki

    Meeting abstracts of the Physical Society of Japan   56 ( 2 )   312 - 312   2001.9

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  • XANES study of charge ordering on the spin-Peierls phase transition of α′-NaV2O5

    Takahisa Shobu, Takahisa Shobu, Yukio Noda, Emi Ninomiya, Hiroshi Sawa, Shin Ichi Nagamatsu, Takashi Fujikawa, Yutaka Ueda, Masahiko Isobe, Naoshi Ikeda, Tomoya Uruga

    Journal of Synchrotron Radiation   8   746 - 748   2001.3

  • X-ray Diffraction Study on Metal-insulator Transition in BaVS3

    T. Inami, H. Kimura, H. Nakamura, K. Ohwada, Y. Noda, N. Ikeda, Y. Murakami

    SPring-8 User Experiment Report   7   19 - 19   2001

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  • Current Status of Single Crystal SR X-ray Structure Analysis at High Pressure at SPring-8

    Yukio Noda, Takahisa Shobu, Naoshi Ikeda

    The Review of High Pressure Science, Technology   11 ( 3 )   211 - 219   2001

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    In this article, we review recent activities at BL02B1 at SPring-8 in the field of single-crystal and high-pressure X-ray diffraction experiments. A comparison of experiments performed two decades ago with the new frontier experiments is also shown. Special attention is paid to the importance of the quantitative arguments. The chracteristics of the single-crystal and high-pressure experiments are also compared with the powder-sample and high-pressure experiments.

    DOI: 10.4131/jshpreview.11.211

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  • Devil's Flower Case of Isolated Hydrogen-Bonded Compound, d-BrHPLN, at High Pressure and Low Temperature?

    R. Kiyanagi, H. Kimura, M. Watanabe, Y. Noda, T. Shobu, N. Ikeda, M. Mizumaki

    SPring-8 User Experiment Report   7   229 - 229   2001

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  • Low Temperature Structure of SrV_6O_<11>

    Ikeda N., Mizumaki M., Hata Y., Kita E., Nishibori E., Takata M., Kanke Y., Ikeda T.

    Meeting abstracts of the Physical Society of Japan   55 ( 2 )   343 - 343   2000.9

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  • Examination on the structural change at the magnetic field-induced insulator-to-metal transition in Eu_<0.6>Sr_<0.4>MnO_3

    Nakamura S., Shimomura S., Ikeda N., Suzuki M.

    Meeting abstracts of the Physical Society of Japan   55 ( 2 )   495 - 495   2000.9

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  • "Devil's Staircase" Type Phase Trasition of NaV_2O_5 under High Pressure

    Ohwada K., Nakao H., Katsuki Y., Takesue N., Fujii Y., Isobe M., Ueda Y., Itoh K., Amemiya Y., Wakabayashi Y., Murakami Y., Fujihisa Y., Aoki K., Shoubu T., Noda Y., Ikeda N.

    Meeting abstracts of the Physical Society of Japan   55 ( 2 )   536 - 536   2000.9

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  • Magnetic Properties in the Ce(Fe_>1-x>Co_x)_2

    Mizumaki Masaichiro, Kotiya Toshio, Ikeda Naoshi, Yoshii Kenji, Miyagawa Hayato, Nanao Susumu

    Meeting abstracts of the Physical Society of Japan   55 ( 1 )   398 - 398   2000.3

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  • X-ray diffuse scattering study on charge-localized states of Pr1-xCaxMnO3(x=0.35,0.4,0.5)

    S. Shimomura, T. Tonegawa, K. Tajima, N. Wakabayashi, N. Ikeda, T. Shobu, Y. Noda, Y. Tomioka, Y. Tokura

    Physical Review B   62 ( 6 )   3875 - 3878   2000

  • 24pPSB-65 Magnetic Properties of Diluted Triangular Magnet LuFeCuO_4

    Ikeda N, Nakamura S, Tanaka M, Mizumaki M, Ohnishi N

    Meeting abstracts of the Physical Society of Japan   54 ( 2 )   377 - 377   1999.9

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  • 26pPSA-52 Magnetic structure of Er film

    Tanaka Yoshikazu, Yamazaki Hiroki, Shimomura Susumu, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan   54 ( 2 )   421 - 421   1999.9

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  • Charge Ordering in La1-xSrxMnO3(x〜0.12) (Proceedings of the Second International Conference on SRMS(Synchrotron Radiation in Materials Science)(2))

    Japanese Journal of Applied Physics Pt. 1 Regular Papers, Short Notes & Review Papers   38 ( 1 )   212 - 214   1999.6

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  • Direct observation of charge ordering on La_<1-x>Sr_xMnO_3 using x-ray anomalous scattering

    INAMI T., IKEDA N., MURAKAMI Y., KOYAMA I., WAKABAYASHI Y., YAMADA Y.

    Meeting abstracts of the Physical Society of Japan   53 ( 2 )   724 - 724   1998.9

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  • Dielectric Properties and Charge Ordering in RFe_2O_4 (4)

    IKEDA N., TANAKA M., TAKAHASHI R., SASAKI S., YAMADA Y.

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   118 - 118   1998.3

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  • Dielectric Praperties of Valence Fluctuating System

    YAMADA Y., IKEDA N.

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   118 - 118   1998.3

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  • 6a-F-12 X-ray diffraction and Neutron-Scattering of Relaxor Ferroelectrics Pb(Zn_<1/3>Nb_<2/3>)O_3-9PbTiO_3

    Tazawa H., Fujishiro K., Ikeda N., Uesu Y., Yamada Y., Kiat J.M.

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   125 - 125   1997.9

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  • 5p-PSA-38 Magnetic Properties of LuFeCuO_4

    Ikeda N., Nakamura S., Ohnishi N., Tanaka M., Fujii S., Kohn K.

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   443 - 443   1997.9

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  • 6p-W-1 Charge Ordering in Pr_<0.75>Ca_<0.25>MnO_3

    Hino O., Takahashi R., Ikeda N., Yamada Y., Inami T.

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   642 - 642   1997.9

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  • 7a-YK-5 Magnetic Properties of ZnV_2O_4

    Fujii S., Kohn K., Ikeda N., Inami T., Ueda Y.

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   529 - 529   1997.9

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  • 5p-PSA-48 AC Magnetic Susceptibility of Reentrant Spin Glass Fe_<1-x>Al_x in Static Magnetic Field

    Ikeda N., Fujii S., Kohn K., Suzuki J.

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   445 - 445   1997.9

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  • 29a-B-3 Dielectric Properties and Charge Ordering in 2-Dimensional Triangular Antiferromagnet RFe_2O_4(3)

    Ikeda N., Nohdo S., Yamada Y., Takahashi E., Kohn K., Kito S.

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   134 - 134   1997.3

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  • 29a-B-1 Dielectric Properties and Charge Ordering in RFe_2O_41

    Nohdo S., Mori S., Yamamoto N., Ikeda N., Yamada Y.

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   133 - 133   1997.3

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  • 29a-B-2 Ferroelectricity and Charge Ordering of RFe_2O_4

    Takahashi E., Odaka K., Kohn K., Ikeda N., Yamada Y.

    Meeting abstracts of the Physical Society of Japan   52 ( 1 )   134 - 134   1997.3

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  • Dielectric Properties and Charge Ordering in 2-Dimensional Triangular Antiferromagnet RFe_2O_4

    Ikeda N., Nohdo S., Yamada Y., Takahashi E., Kohn K.

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1996 ( 2 )   98 - 98   1996.9

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  • Dielectric Relaxation of RFe_2O_4 II

    Ikeda N., Odaka K., Kito H., Kohn K.

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1995 ( 3 )   48 - 48   1995.9

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  • Magnetic properties of Fe_2TiO_5 single crystal

    Miyahara Shunsuke, Ikeda Naoshi, Hokkyo Hirotaka, Kohn Kay

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1995 ( 3 )   50 - 50   1995.9

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  • Dielectirc Properties and Charge Ordering in RFe_2O_4

    Ikeda N., Kato S., Kito H., Kohn K.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   50 ( 3 )   84 - 84   1995.3

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  • 3p-PSA-20 Dielectric Relaxation and Charge Ordering in ErFe_2O_4

    Ikeda N, Kito H, Kohn K, Akimitsu J, Siratori K

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1994 ( 3 )   100 - 100   1994.8

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  • 3p-PSA_19 Dielectric Properties and Verwey Transition in YFe_2O_4

    Takashima K, Egawa Y, Kito H, Ikeda N, Kohn K, Tanaka M

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1994 ( 3 )   99 - 99   1994.8

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  • 30p-PSA-11 AC Magnetic Susceptibility of RFe_2O_4 System II

    Ikeda Naoshi, Hokkyo Hirotaka, Natsume Chizuko, Miyahara Shunsuke, Tanaka Midori, Kohn Kay

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   49 ( 3 )   142 - 142   1994.3

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  • 30p-PSA-15 Magnetic Properties of Eu_2CuO_4 single Crystal

    Hokkyo Hirotaka, Ikeda Naoshi, Kohn Kay

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   49 ( 3 )   144 - 144   1994.3

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  • 13a-R-17 Spin Slowdynamics of Superparamagnetic Co-Ag Co-evaporated Thin Films

    Ohigashi R., Ikeda H., Ikeda N., Erata T., Kita E., Tasaki A.

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1993 ( 3 )   43 - 43   1993.9

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  • 31p-PSB-43 Spin Slowdynamics of Superparamagnetic Co-Ag Co-evaporated Thin Films

    Ohigashi R., Ikeda N., Erata T., Kita E., Tasaki A.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   48 ( 3 )   120 - 120   1993.3

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  • 29a-S-13 Magnetic properties of LuFeMgO_4 : Mossbauer spectroscopy

    Himoto E., Tanaka M., Iida J., Ikeda N.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   48 ( 3 )   20 - 20   1993.3

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  • 26a-PS-56 Low temperature phase transition in the two-dimensional triangular antiferromagnet ErFe_2O_<4-δ>

    KITO Hijiri, AKIMITSU Jun, SAITO Kazuhiro, IKEDA Naoshi

    1992 ( 3 )   128 - 128   1992.9

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  • 25a-N-7 Seperparamagnetism of Co-Ag Co-evaporated Thin Films

    Ohigashi R, Ikeda N, Erata T, Kita E, Tasaki A

    1992 ( 3 )   19 - 19   1992.9

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  • 27a-N-9 Magnetic properties of LuFeMgO_4

    HIMOTO Etsuko, IKEDA Naoshi, TANAKA Midori, IIDA Junji

    1992 ( 3 )   144 - 144   1992.9

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  • 26a-PS-57 AC Susceptibility of LuFe_2O_4 Single Crystal in High Magnetic Field

    IKEDA Naoshi, KOHN Keiichiro, NAKAGAWA Yasuaki, SHIRATORI Kiichi

    1992 ( 3 )   128 - 128   1992.9

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  • 30a-PS-23 Superparamagnetism of Co-Ag Co-evaporated Thin Films

    Ohigashi R, Ikeda N, Erata T, Kita E, Tasaki A

    47 ( 3 )   106 - 106   1992.3

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  • 29p-PS-58 Magnetic Properties of Amorphous BiFeO_3 (IV)

    Nakamura M, Soeya S, Ikeda N, Tanaka M

    47 ( 3 )   63 - 63   1992.3

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  • 28p-PS-58 Superconductive transition temperature in RE_<1-x>Cd_xBa_2Cu_3O_y system II

    Ikeda N., Okajima Y., Higuchi S., Kohn K.

    47 ( 3 )   299 - 299   1992.3

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  • 30a-ZK-6 Magnetic Critical Phenomena of the two-dimensional triangular antiferromagnet ErFe_2O_<4-δ>

    KITO Hijiri, AKIMITSU Jun, IIDA Junji, TANAKA Midori, IKEDA Naoshi, SHIRATORI Kiiti

    47 ( 3 )   88 - 88   1992.3

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  • 28a-APS-40 Magnetic Properties of Amorphous BiFeO_3 (III).

    Nakamura S., Soeya S., Ikeda N., Tanaka M.

    46 ( 3 )   86 - 86   1991.9

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  • 28p-APS-4 Superconductive transition temperature in(RE,Cd)Ba_2Cu_3O_Y system.

    Ikeda N., Higuchi S., Okajima Y., Kohn K.

    46 ( 3 )   319 - 319   1991.9

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  • 27p-G-12 Spin Glass Behavior in Amorphous BiFeO_3

    Nakamura S., Soeya S., Ikeda N., Tanaka M.

    1991 ( 3 )   150 - 150   1991.3

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  • 6p-Z-11 Superconductivity of (RE, Cd)Ba_2Cu_3O_v(RE=La, Nd, Sm)

    N Ikeda, N Takada, M Terashima, K Kohn

    1989 ( 3 )   361 - 361   1989.9

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  • 11a-W-9 Eu_xSr_<1-x>Sの臨界比熱 II

    栄岩 哲二, 喜多 英治, 近 桂一郎, 池田 直, 白鳥 紀一, 田崎 明

    秋の分科会講演予稿集   1983 ( 3 )   67 - 67   1983.9

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  • 30p-SD-7 Eu_xSr_<1-x>Sの臨界比熱

    栄岩 哲二, 喜多 英治, 田崎 明, 近 桂一郎, 池田 直, 伊東 克己, 白鳥 紀一

    年会講演予稿集   37 ( 3 )   82 - 82   1982.9

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▼display all

Presentations

  • Correlation among magnetic field, spin fluctutaion, and electric polarization exhibited by electronic ferroelectric oxide RFe2O4 in nonmangetic state Invited

    Naoshi Ikeda

    REIMEI Workshop: Physics of Advanced Functional Materials  2024.10.11 

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    Event date: 2024.10.10 - 2024.10.11

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Electronic Ferroelectricity in RFe2O4 Invited

    Naoshi Ikeda, Yoichi Okimoto

    The 14th Japan-Korea Conference on Ferroelectricity  2024.9.1 

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    Event date: 2024.8.29 - 2024.9.1

    Language:English   Presentation type:Oral presentation (keynote)  

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  • RFe2O4の電子強誘電性の起源 Invited

    池田直

    産業技術総合研究所 電子光基礎技術研究部門 講演会  2024.6.20 

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  • Pd触媒のNO‐CO反応における担体効果

    重名智博, 狩野旬, 藤井達生, 森茂生, 池田直

    日本物理学会講演概要集(CD-ROM)  2018.3.23 

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  • Unusual valence change of metal nanoparticles on the ferroelectric II

    Yoshida T, Fujii T, Ohkubo T, Ueda T, Kano J, Mizumaki M, Nitta K, Kato K, Hinokuma H, Oshime N, Ikeda N

    Meeting Abstracts of the Physical Society of Japan  2017  The Physical Society of Japan

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    &lt;p&gt;強誘電体に金属ナノ粒子を接合させると強誘電体の分極により金属の電子状態が変調すると考えられる。電子状態変化が触媒作用に影響することが示唆されているが、電子状態異常の直接的な観測例はない。今回、強誘電体BaTiO_3_表面に担持したPdO_x_ナノ粒子に対してX線吸収微細構造(XAFS)測定を行い、粒子表面で異常な価数状態をとることを見出した、またその発現機構についての考察を行ったので報告する。&lt;/p&gt;

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  • Electronic states modulated by electric polarization in ferroelectric BaTiO3

    Oshime N., Itoh M., Fujii T., Yasui A., Kano J., Ikenaga E., Yasui S., Hinokuma S., Ikeda N., Hamasaki Y., Yasuhara S., Yokoya T.

    Meeting Abstracts of the Physical Society of Japan  2017  The Physical Society of Japan

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  • Direct observation of band bending structure on ferroelectric BaTiO3

    Oshime N, Kano J, Ikenaga E, Yasui S, Hinokuma S, Ikeda N, Yokoya T, Fujii T

    Meeting Abstracts of the Physical Society of Japan  2017  The Physical Society of Japan

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    &lt;p&gt;自発分極は試料内部の静電ポテンシャルを傾斜させる。強誘電体の原子軌道エネルギーはこの傾斜に応じて系統的に変化すると考えられる。この現象はバンドベンディングと呼ばれ40年以上に渡り予想されてきた。今回,BaTiO_3_においてバンドベンディング現象を直接的に観測したので報告する。本研究において得られた実験結果は,エピタキシャル製膜された強誘電体薄膜試料と深さ分解光電子分光実験を組み合わせることで初めて達成できた。&lt;/p&gt;

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  • BaTiO3を担体としたパラジウム微粒子の価数状態

    吉田右, 狩野旬, 狩野旬, 押目典宏, 日隈聡士, 日隈聡士, 為則雄祐, 加藤和男, 新田清文, 水牧仁一朗, 池田直, 藤井達生, 大久保智子, 上田剛慈

    日本セラミックス協会年会講演予稿集(CD-ROM)  2016.3 

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  • High-magnetic-field x-ray magnetic circular dichroism of Electronic Ferroelectric RFe2O4

    Narumi Yasuo, Fujiwara Kosuke, Kambe Takashi, Ikeda Naoshi, Yasumura Hiromasa, Nojiri Hiroyuki, Kotani Yoshinori, Nakamura Tetsuya

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • 21aPS-116 Dielectric and magnetic property of Mn doped (YbFe_2O_4)_m(YbFeO_3)_n, m=1, n=1 single crystal

    Karasudani T., Fujiwara K., Fujii T., Todori K., Kobayashi H., Fukunaga M., Horibe Y., Kano J., Ikeda N.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • 20pAQ-4 Magnetic and dielectric properties and charge order of YbFe_2O_4 with controlled iron vacancy

    Fujiwara K., Kakurai K., Mitsui T., Nakamura S., Ikeda N., Karasudani T., Kobayashi H., Fukunaga M., Kano J., Dissanayake Sachith, Matsuda M., Fernandez-Baca Jaime, Nakajima T.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • Quantitative study of band structure in iron oxides

    Oshime N., Kano J., Okamoto T., Ikeda N., fujii T.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • Dielectric property of Mn doped Yb2Fe3O7 single crystal

    Karasudani T., Fujiwara K., Fujii T., Todori K., Fukunaga M., Horibe Y., Kano J., Ikeda N.

    Meeting Abstracts of the Physical Society of Japan  2016  The Physical Society of Japan

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  • 18aPS-73 Unusual valence change of metal nanoparticles on the ferroelectric BaTiO_3

    吉田 右, 狩野 旬, 押目 典宏, 日隈 聡士, 加藤 和男, 新田 清文, 水牧 仁一朗, 池田 直, 藤井 達生, 大久保 智子, 上田 剛慈

    日本物理学会講演概要集  2015.9.16  The Physical Society of Japan (JPS)

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  • 22pCH-13 Catalysis in metal-ferroelectric junctions

    Kano J., Ikeda N., Oshime N., Fujii T., Hashimoto H., Teranishi T., Ohkubo T., Ueda T., Yoshida T., Akiyama Y.

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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  • 22aCH-4 dielectric and the charge ordered structure changes by iron ion content of YbFe_2O_4

    Fujiwara Kosuke, Miyajima Mizuki, Fukunaga Mamoru, kano Jun, Nagata Tomoko, kambe Takashi, Ikeda Naoshi

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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  • 16aAD-3 Charge order and ferroelectricity of stoichiometric YbFe_2O_4 1

    Fujiwara K., Miyajima M., Karasudani T., Fukunaga M., Kobayashi H., Nagata T., Kano J., Ikeda N.

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan

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  • 21pCJ-7 Mg-doping effects in Ba_<0.8>Sr_<0.2>TiO_3

    Oshime N., Kano J., Osaki K., Teranishi T., Yoshida T., Ikeda N., Fujii T., Ohkubo T., Ueda T.

    Meeting Abstracts of the Physical Society of Japan  2015  The Physical Society of Japan (JPS)

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  • 7aPS-10 Semiconductor and Dielectric Properties of RFe_2O_4

    Fujiwara Kosuke, Miyajima Mizuki, Nagata Tomoko, Fukunaga Mamoru, Kambe Takashi, kano Jun, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan  2014.8.22  The Physical Society of Japan (JPS)

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  • 8pAF-11 Band structure and post-annealing treatment of BaTiO_3

    Oshime N., Kano J., Fujii T, Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2014.8.22  The Physical Society of Japan (JPS)

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  • Relation of the band gap and chemical equivalent of Ba_<1-x>Sr_xTiO_3

    Oshime N., Kano J., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.8.26  The Physical Society of Japan (JPS)

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  • Ultrafast charge and lattice dynamics of photoinduced phase transition in LuFe_2O_4 II

    Yamada K., Ishikawa T., Sagae Y., Itoh H., Kano J., Nagata T., Fukada Y., Kambe T., Sasaki T., Ishihara S., Ikeda N., Iwai S.

    Meeting abstracts of the Physical Society of Japan  2013.8.26  The Physical Society of Japan (JPS)

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  • Phase transition of mixed valence layered iron oxide, YbFe_2O_4 II

    Nagata T., Kano J., Fukunaga M., Kambe T., Roman B., Feyerherm R., Dudzik E., Janolin P.E., Kiat J.M., Hasegawa N., Takesada M., Onodera A., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.8.26  The Physical Society of Japan (JPS)

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  • Photoinduced charge/spin order transition in LuFe_2O_4

    Itoh K., Goto K., Yamada K., Ishikawa T., Itoh H., Ishihara S., Saito S., Kano J., Nagata T., Fukada Y., Kambe T., Ikeda N, Iwai S.

    Meeting abstracts of the Physical Society of Japan  2013.8.26  The Physical Society of Japan (JPS)

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  • 26aPS-134 Application of Lead-Free Solder to Electrodes on Dielectrics

    Fukunaga M., Kano J., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 27aXS-10 Semiconductor Property of RFe_2O_4(II)

    Kawai Masahiro, Ejiri Hiroki, Okamura Naoya, Fukada Yukimasa, Nagata Tomoko, Kano Jun, Kambe Takashi, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 26pEJ-3 Ultrafast charge&lattice dynamics of photoinduced phase transition in LuFe_2O_4

    Yamada K., Ishikawa T., Itoh K., Goto K., Sagae Y., Itoh H., Saito S., Kano J., Nagata T., Fukada Y., Kambe T., Sasaki T., Ishihara S., Ikeda N., Iwai S.

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 28pXS-2 Magnetoelectric response of LuFe_2O_4 by using impedance analysis

    Fukada Y., Nagata T., Kawai M., Ejiri H., Fukunaga M., kano J., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 27pXZB-11 Electric state of Fe oxide nano-particles on BaTiO_3,ZrO_2

    Okamoto T., Kano J., Nakamura S., Fuwa A., Otoyama T., Nakazaki Y., Hashimoto H., Takada J., Oshime N., Ito M., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 28pXS-1 Symmetry study of mixed valence layered iron oxide, YbFe_2O_4

    Nagata T., Fukada Y., Kawai M., Kano J., Fukunaga M., Kambe T., Guiblin N., Feyerherm R., Dudzik E., Janolin P. E., Kiat J. M., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 26aPS-137 Interlayer dynamics of photoinduced phase transition in LuFe_2O_4

    Sagae Y., Itoh K., Itoh H., Iwai S., Ishihara S., Saito S., Kano J., Nagata T., Fukada Y., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2013.3.26  The Physical Society of Japan (JPS)

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  • 27aPS-137 Temperature dependence of Fe2p X-ray-emission spectra of LuFe_2O_4 II

    AGUI Akane, KAWAI Masahiro, NAGATA Tomoko, MIZUMAKI Masaichiro, IZUMI Yudai, IKEDA Naoshi

    Meeting Abstracts of the Physical Society of Japan  2013  The Physical Society of Japan

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  • Fe 2p-edge x-ray emission spectra of RFe_2O_4 (R=Lu,Yb)

    Agui Akane, Mizumaki Masaichiro, Nagata Tomoko, Kawai Masahiro, Ikeda Naoshi

    Meeting Abstracts of the Physical Society of Japan  2013  The Physical Society of Japan

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  • 18pGB-8 Phase transition of mixed valence layered iron oxide, YbFe_2O_4

    Nagata T., Fukada Y., Kano J., Fukunaga M., Kambe T., Roman B., Boemare G., Feyerherm R., Dudzik E., Janolin P. E., Kiat J. M., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2012.8.24  The Physical Society of Japan (JPS)

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  • 18pPSA-57 Charge ordering phenomena in RFe_2O_4

    Mori Shigeo, Horibe Yoichi, Nagata Tomoko, Yoshii Kenji, Ikeda Naoshi

    Meeting abstracts of the Physical Society of Japan  2012.8.24  The Physical Society of Japan (JPS)

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  • 18pGB-9 Impedance dependence on the electrode on LuFe_2O_4

    Fukada Y., Nagata T., Kawai M., Ejiri H., Fukunaga M., Kano J., Kambe T., Ikeda N.

    Meeting abstracts of the Physical Society of Japan  2012.8.24  The Physical Society of Japan (JPS)

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  • 24aYF-4 Anisotropy of Dielectric Constant on LuFe_2O_4 under Magnetic Field

    Fukada Y., Nagata T., Kano J., Kambe T., Ikeda N., Kawai M.

    Meeting abstracts of the Physical Society of Japan  2012.3.5  The Physical Society of Japan (JPS)

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  • 21aPSB-30 Temperature dependence of Fe2p X-ray-emission spectra of LuFe_2O_4

    AGUI Akane, NAGATA Tomoko, MIZUMAKI Masaichiro, IKEDA Naoshi

    Meeting Abstracts of the Physical Society of Japan  2012  The Physical Society of Japan

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  • 20aGF-9 Magnetic Properties and Electronic Properties of LuGaFeO_4

    Kuroda T, Fukuyama R, Kitamura S, Funae T, Matsuo Y, Ikeda N, Kambe T, Agui A, Kimizuka N

    Meeting Abstracts of the Physical Society of Japan  2010  The Physical Society of Japan

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  • θ‐(BEDT‐TTF)2MZn(SCN)4(M=Cs,Rb)の低温電荷秩序構造

    野上由夫, 山本健一郎, 柿沼光之, 小椋美鈴, 横田研太郎, 花咲徳亮, 池田直, 神戸高志, 張宇, 眞苅伸明, 立石拓麻, 渡邉真史, 小山内雅人, 野田幸男, 寺崎一郎, 稲田太一, 大西祐也, 伊藤崇芳, 豊川秀訓, 大隅寛幸, 森初果, 森健彦

    日本物理学会講演概要集  2009.3.3 

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  • 27pTD-13 Fe 3p→1s X-ray Resonant Emission Spectroscopy of LuFe_2O_4 single crystal

    Agui Akane, Mizumaki Masaichiro, Kawamura Naomi, Kuroda Tomoko, Hayakawa Hironori, Maeda Daisuke, Michiuchi Takamasa, Ikeda Naoshi

    Meeting Abstracts of the Physical Society of Japan  2009  The Physical Society of Japan

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  • 30aYF-2 LT CO Structure in θ-(BEDT-TTF)_2MZn(SCN)_4 (M=Cs,Rb)

    Nogami Y, Magari N, Tateishi T, Watanabe M, Osanai M, Noda Y, Terasaki I, Inada T, Onishi Y, Ito T, Toyokawa H, Yamamoto K, Ohsumi H, Mori H, Mori T, Kakinuma M, Ogura M, Yokota K, Hanasaki N, Ikeda N, Kambe T, Chou U

    Meeting Abstracts of the Physical Society of Japan  2009  The Physical Society of Japan

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  • θ‐(BEDT‐TTF)2RbZn(SCN)4の急冷・非線形伝導状態における電荷秩序競合と格子の変調

    渡邉真史, 山本健一郎, 柿沼光之, 野上由夫, 花咲徳亮, 池田直, 神戸高志, 横田研太郎, 伊藤崇芳, 豊川秀訓, 大隅寛幸, 小山内雅人, 野田幸男, 稲田太一, 寺崎一郎, 森初果, 森健彦

    日本物理学会講演概要集  2008.8.25 

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  • o‐TaS3における電場誘起ディスコメンシュレーション

    稲垣克彦, 坪田雅功, 東山和樹, 市村晃一, 丹田聡, 山本健一郎, 花咲徳亮, 池田直, 野上由夫, 伊藤崇芳, 豊川秀訓

    日本物理学会講演概要集  2008.2.29 

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  • Θ‐(BEDT‐TTF)2RbZn(SCN)4の超急冷相での変調構造

    山本健一郎, 花咲徳亮, 野上由夫, 柿沼光之, 横田研太郎, 池田直, 神戸高志, 渡邉真史, 野田幸男, 寺崎一郎, 稲田太一, 森初果, 森健彦, 伊藤崇芳, 豊川秀訓, 大隅寛幸

    日本物理学会講演概要集  2008.2.29 

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    Event date: 2008.2.29

    Language:Japanese  

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  • 20aQA-11 Magnetic and dielectric properties of electronic ferroelectric RFe_2O_4 and related oxides (R: rare earths)

    Yoshii Kenji, Ikeda Naoshi, Okajima Yuka, Yoneda Yasuhiro, Matsuo Yoji, Horibe Yoichi, Mori Shigeo

    Meeting Abstracts of the Physical Society of Japan  2008  The Physical Society of Japan

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    Event date: 2008

    Language:Japanese  

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  • 24aPS-36 Magnetic and dielectric properties of R_<0.5>Ca_<0.5>MnO_3(R: rare earths)

    Yoshii Kenji, Hiramitsu Yusuke, Okajima Yuka, Yoneda Yasuhiro, Nihsihata Yasuo, Mizuki Jun'ichiro, Ikeda Naoshi

    Meeting Abstracts of the Physical Society of Japan  2008  The Physical Society of Japan

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    Event date: 2008

    Language:Japanese  

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  • 22pVE-9 Local structural change of CaCu_3Ti_4O_<12> in low temperature phase

    YONEDA Yasuhiro, YOSHII Kenji, Hayakawa Hironori, Aoyagi Rintaro, Ikeda Naoshi

    Meeting Abstracts of the Physical Society of Japan  2008  The Physical Society of Japan

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    Event date: 2008

    Language:Japanese  

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  • θ‐(BEDT‐TTF)2CsM(SCN)4における電流密度に依存するエネルギーギャップ

    寺崎一郎, 澤野文章, 須子友博, 田崎秀一, 森初果, 森健彦, 野上由夫, 池田直, 渡邉真史, 野田幸男

    日本物理学会講演概要集  2007.8.21 

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    Event date: 2007.8.21

    Language:Japanese  

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  • 時間分割2次元ディテクタを用いたθ‐(BEDT‐TTF)2CsZn(SCN)4の電流下X線回折実験

    渡邉真史, 山本健一郎, 伊藤崇芳, 花咲徳亮, 池田直, 野上由夫, 豊川秀訓, 大隅寛幸, 野田幸男, 稲田太一, 須子友博, 寺崎一郎, 森初果, 森健彦

    日本物理学会講演概要集  2007.8.21 

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    Event date: 2007.8.21

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  • 24aWH-7 Electronic Structure of 3d in Fe^<2+> and Fe^<3+> of LuFe_2O_4

    Agui Akane, Ikeda Naoshi, Morimoto Masanori, Uozumi Takayuki, Kaamber Tanle

    Meeting Abstracts of the Physical Society of Japan  2007  The Physical Society of Japan

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    Event date: 2007

    Language:Japanese  

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  • 有機サイリスタ「直流を交流に変化する有機単結晶」を発見

    寺崎一郎, 池田直

    SPring-8 Information  2006 

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    Event date: 2006

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  • 共鳴X線散乱で見つけた強誘電体

    池田直

    日本放射光学会誌  2006 

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    Event date: 2006

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  • 13aRB-7 Structural aspects of C_0 phase of NaV_2O_5

    Ohwada K, Fujii Y, Noda Y, Nakao H, Murakami Y, Ohsumi H, Ikeda N, Sawa H, Isobe M, Ueda Y

    Meeting abstracts of the Physical Society of Japan  2004.8.25  The Physical Society of Japan (JPS)

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    Event date: 2004.8.25

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  • Orbitally Ordered State in Y_<1-x>Ca_xTiO_3 Studied by Resonant X-ray Scattering

    Kodama S, Nakao H, Murakami Y, Tsubota M, Iga F, Uchihira K, Kura S, 竹村 征樹, Takabatake T, Ohsumi H, Mizumaki M, Ikeda N

    Meeting abstracts of the Physical Society of Japan  2003.8.15  The Physical Society of Japan (JPS)

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    Event date: 2003.8.15

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  • "Devil's Staircase" Type Phase Trasition of NaV_2O_5 under High Pressure

    Ohwada K, Nakao H, Katsuki Y, Takesue N, Fujii Y, Isobe M, Ueda Y, Itoh K, Amemiya Y, Wakabayashi Y, Murakami Y, Fujihisa Y, Aoki K, Shoubu T, Noda Y, Ikeda N

    Meeting abstracts of the Physical Society of Japan  2000.9.10  The Physical Society of Japan (JPS)

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    Event date: 2000.9.10

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Works

  • 酸化鉄加工物「グリーンフェライト(R)」を用いた次世代型太陽電池の実用化に向けた取組

    2013

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Awards

  • 日本物理学会第70回年次大会 領域10 学生奨励賞

    2015  

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    Country:Japan

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  • 日本物理学会2015年秋季大会 領域10 学生奨励賞

    2015  

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    Country:Japan

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  • ポスター賞(第6回誘電体若手夏の学校)

    2014  

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    Country:Japan

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  • Future Ferroelectrics 2014 Presentation Award

    2014  

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  • ポスター賞(ISIAME2012 Poster Award)

    2012  

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    Country:Japan

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  • ISIAME2012 Poster Award

    2012  

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Research Projects

  • 希土類複合酸化物における電子強誘電性の電界・光・磁場による分極制御とイメージング

    Grant number:22H01153  2022.04 - 2025.03

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    沖本 洋一, 池田 直

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    Grant amount:\17680000 ( Direct expense: \13600000 、 Indirect expense:\4080000 )

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  • Successive charge order pahse transition in electronic ferroelectrics

    Grant number:22H01942  2022.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    池田 直, 藤井 達生, 沖本 洋一, 藤原 孝将

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    Grant amount:\17420000 ( Direct expense: \13400000 、 Indirect expense:\4020000 )

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  • 希土類複合酸化物における電子強誘電性の電界・光・磁場による分極制御とイメージング

    Grant number:23K22424  2022.04 - 2025.03

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    沖本 洋一, 池田 直

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    Grant amount:\17680000 ( Direct expense: \13600000 、 Indirect expense:\4080000 )

    鉄複電荷酸化物RFe2O4(R=希土類イオン)は、W-Layerと呼ばれるFeイオンと酸素イオンからなる二重層が積層してできた構造を持つ。このW-Layerの間でFe2+とFe3+ の数が不均化を起こすために、RFe2O4は室温で電気分極を持つ。このような材料は電子強誘電体と呼ばれ近年注目を集めている。本研究では、この電子強誘電体RFe2O4(R=希土類イオン)の強誘電分極を、光、電場、磁場で制御し、観察することが目的である。研究初年度では、LuFe2O4結晶(R=Lu)の光照射による分極状態の高速制御を試みた。まず初めに、LuFe2O4結晶のab面およびac面における第二次高調波発生(SHG)の入射偏光角依存性を測定し、この系の二次の非線形感受率のc軸成分に起因する成分を初めて観測することができた。次に、LuFe2O4結晶のフェムト秒時間分解ポンプ・プローブSHG変化の測定を行った。この結晶に800 nmのフェムト秒パルスを照射するとFe2+→Fe3+ のd-d 遷移が発生し、それによって鉄イオンの電荷秩序構造が擾乱されることが知られている。よって、そのような光励起にともなって、SHG,すなわち系の分極状態がどのような時間スケールで変化するかを詳細に調べた。その結果、この光励起によりab面内のSHG強度は100フェムト秒以内に減少しその状態が保持されるのに対し、c軸方向のSHG強度は瞬間的に励起前よりも増大した後に1~3ピコ秒かけてゆっくり元の状態に回復するという極めて異方的な分極ダイナミクスが観測された。これから、W-Layer内の面内の電荷整列状態は光励起で大きく乱されるのに対し、W-Layer間のFe2+とFe3+ の不均化構造はむしろ増大し、その結果系の分極が増強することがわかった。本研究から、光照射により電子の秩序によって発生する非熱的な分極増大が起こること、およびその分極変化を室温で100 fsスケールで高速に制御することができることが明らかになった。

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  • Study in the successive transition of the charge-ordering phase in electron ferroelectrics

    Grant number:23K23210  2022.04 - 2025.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    池田 直, 藤井 達生, 沖本 洋一, 藤原 孝将

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    Grant amount:\17420000 ( Direct expense: \13400000 、 Indirect expense:\4020000 )

    我々は電子集団が自発的に極性な配置を形成する電子強誘電体が常温に存在することを解明してきた。さらにこの物性が、超高速応答、省電力分極反転、THz発生源動作,マルチフェロイック機能などの魅力的な新機能を持つことも明らかにしつつある。一方でこの物性の起源に対する理論的解釈では、鉄d電子間の電荷間クーロン相互作用、Fe2+に存在するホール軌道による超交換相互作用の量子縮退と競合、さらにそれらの熱ゆらぎ効果にあるとされているが、その実験的証拠はまだ十分に得られていない。
    本研究は、電子強誘電体の低温の逐次相転移近傍に注目し、極性電荷秩序(強誘電)相と非極性電荷秩序相の境界領域、さらにそれに重なる磁気相転移点付近での誘電・磁気応答や電子構造を解析することを目標としている。最終的にFeイオン間相互作用の光制御手法を完成し、この相境界付近での光―誘電―磁 気応答を精密に評価することで、電子強誘電体の起源 であるd電子間相互作用とスピン揺らぎ効果の役割を、世界に先駆け総合的に解明することである。
    本年度は特に、YFE2O4の示す磁気転移発生に伴った3倍電荷秩序相と7倍電荷秩序相の相境界の存在について、詳細な構造がを明らかにしている。また合わせて非磁性の3倍秩序相において、異常な磁歪効果があることを新たに発見した。特に後者について理論研究者も交えた解析が行われている。この現象は本材料が示す、極性な電荷秩序の安定性とスピンゆらぎ効果の顕著な相関(ないし強い因果関係)を示す露頭ではないかと認識され、24年度から集中的な実験が行われることとなった。
    また強誘電分極を示す3倍電荷秩序相のパルス電場応答の異方性を利用すると、メモリー効果を再現できることが判明した。これを応用する研究を、グループを構築して開始した。

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  • Development of new magnetic memory devices using nagative magnetizaion oxides

    Grant number:20H02829  2020.04 - 2023.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    吉井 賢資, 池田 直, 矢板 毅

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    Grant amount:\17420000 ( Direct expense: \13400000 、 Indirect expense:\4020000 )

    前年度の結果を踏まえ、主に、室温近傍で負の磁性が見られたスピネル系の探索を行った。放射光吸収データを用いた局所構造は確定していないため、他のアプローチで研究を行った。応用的見地から、ニッケルよりもクラーク数の大きいマンガンに一部置換するなどの合成を試みたが、現状では負の磁性は観測されていない。さらには、リチウム鉄スピネルなどアルカリ金属を含む系についても探索を行った。負の磁性は見られたものの、負の磁性が発現する温度(補償温度)は最高で280K近傍であり、室温には到達していない。
    別のアプローチとして、過去の論文から、ペロブスカイトクロム酸化物を還元雰囲気中で加熱すると磁気転移温度が上昇するという報告があるため、この手法を試行した。負の磁性を示す(La,Pr)CrO3およびGdCrO3について、CO-CO2混合ガス雰囲気中で1000℃近傍での加熱を行った。COとCO2の流量比は3:1程度で試行した。(La,Pr)CrO3およびGdCrO3の磁気転移温度はそれぞれ250Kおよび170K近傍であり、還元雰囲気での加熱においては1Kほどの上昇傾向が見られたものの、大幅な上昇は観測されなかった。
    以上と並行し、派生的な研究を報告した。磁気冷凍物質の可能性が指摘されている上記GdCrO3について、5%程度Biを置換して合成すると、固相反応における合成温度が1100℃から900℃近辺まで下がることを学会にて報告した。また、クロム酸化物の新規物性の探索を行い、190KにおいてCrとCuの電荷秩序転移と磁気転移が同時に起こるBiCu3Cr4O12において、2つの秩序を同時に用いて効率的な冷凍が行えるマルチ熱量効果を論文発表した。また、電子誘電体RFe2O4について、イオン半径の異なる2つの系の電子線回折測定を行い、鉄三角格子間の距離によって電荷秩序構造の次元性が変化することを論文で報告した。

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  • Precise study on the optical and dielectric response of the stoichiometric iron based electronic ferroelectrics

    Grant number:19H01827  2019.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    IKEDA NAOSHI

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    Grant amount:\17420000 ( Direct expense: \13400000 、 Indirect expense:\4020000 )

    This research has demonstrated for the first time in the world that an electron ferroelectric material exists stably at room temperature. Furthermore, we were able to show that this electronic phase also exists in thin film samples. The electric polarization consisting of only the electron distribution in the electron ferroelectric material is expected to respond significantly faster than that in the displacement-type ferroelectric material, which has been known until now.
    A new dielectric relaxation analysis method using single crystals was developed for the electric polarization of electronic ferroelectrics, which inevitably involves the electric resistivity. As a result, we were able to experimentally show for the first time that in fine charge-ordered domains, charge-ordered nanoregions with larger capacitance have higher electrical resistance.

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  • Fabrication of room-temperature multiferroic materials by rare-earth iron oxide system with triangular lattices

    Grant number:18H02057  2018.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    FUJII Tatsuo

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    Grant amount:\17550000 ( Direct expense: \13500000 、 Indirect expense:\4050000 )

    RFe2O4 is expected as a next-generation multiferroic material. We attempted to synthesize its single-crystalline film by the sputtering method. As a result, the in-plane orientation of the RFe2O4 layer on the sapphire substrate rotates 30 ° depending on the presence of the Fe3O4 buffer layer. When Fe3O4 and RFe2O4 are laminated to form a multilayer film, the in-plane orientation also depends on their stacking order. In addition, when using the YSZ single crystal substrate, we succeeded in obtaining an RFe2O4 thin film that does not have twin domains and is almost completely composed of single domains.

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  • Development of new Cs-absorbing materials based on electric ferroelectrics

    Grant number:17K19090  2017.06 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Exploratory)

    Yoshii Kenji

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    Grant amount:\6370000 ( Direct expense: \4900000 、 Indirect expense:\1470000 )

    We have attempted to fabricate new Cs-absorbing materials based on the electronic ferroelectric RFe2O4 (R: rare earths). Although this purpose has not been attained thus far, we have found that the new carbon-based material called the carbon nanowall (CNW) is a candidate material for Cs absorption, This material is easily synthesized using microwave heating, a property being suitable to applications. Cesium ions were found to be electrochemically absorbed and to form chemical bonding with carbon, as observed from X-ray photoelectron spectroscopy. It was also found that doping of some elements such as B and N can be done during the synthesis process. In addition, we have conducted some other studies such as physical properties of ferroelectric oxides.

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  • 新規熱サイクルと電子強誘電体で実現する高効率低温排熱回収

    Grant number:17H03102  2017.04 - 2020.03

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    吉井 賢資, 池田 直, 林 直顕, 福田 竜生

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    Grant amount:\14040000 ( Direct expense: \10800000 、 Indirect expense:\3240000 )

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  • Coupling between magnetic and dielectric properties in fullerene-based materials

    Grant number:15H03529  2015.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Kambe Takashi, Fukuda Takahito

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    Grant amount:\17030000 ( Direct expense: \13100000 、 Indirect expense:\3930000 )

    Our aim for this study on fullerene-based materials is to understand coupling between magnetic and dielectric properties and to search a long-ranged dielectric order. Firstly, we developed new apparatus for measuring dielectric properties with wide frequency range under high-magnetic fields. We focused the dielectric properties on TDAE-C60 ferromanget and(NH3)K3C60 antiferrmagnet. For TDAE-C60, the relaxation behavior can be observed well below the structural phase transition, but, unfortunately, no long-ranged dielectric order can be observed. For (NH3)K3C60, we observed huge change in the dielectric constant for the first time, which may be due to the orientational ordering of K-NH3 dipole moment. Moreover, dielectric constant increased below 50 K, which may be related with a long-ranged dielectric order. As a result, we confirmed that fullerene-based materials can have a new functionality, i.e., dielectric, and, generally, coexistence of magnetic and dielectric properties.

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  • Development of nuclear resonant scattering diffractometer using synchrotron radiation

    Grant number:26400338  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    NAKAMURA Shinichi, SHIMOMURA Susumu, KOBAYASHI Yasuhiro, KUROKUZU Masayuki, FUJIWARA Kosuke

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    Grant amount:\4810000 ( Direct expense: \3700000 、 Indirect expense:\1110000 )

    At SPring-8 BL11XU, we have developed a nuclear resonant scattering diffractometer (synchrotron Mossbauer diffractometer) by installing θ-2θ goniometer between the nuclear monochromater and a detecting counter. A specific spectrum arising only from a selected γ ray reflection can be measured, which will represent crystal-site-selective Mossbauer spectrum. In order to extract only nuclear resonant scattering, we have established 45 degree-method, polarization analyzer method, and pure nuclear Bragg reflection method. With the use of these three methods, we have succeeded in obtaining crystal-site-selective Mossbauer spectra of typical multi-Fe-site compounds, Fe3O4 and Fe3BO6.

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  • Novel dielectric phenomena in electric ferroelectricity

    Grant number:26287070  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Ishihara Sumio, NAKA Makoto, IWAI Shinichiro, SASAKI Takahiko, IKEDA Naoshi, MATSUEDA Hiroaki, MATSUMOTO Munehisa, WATANABE Tsutomu

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    Grant amount:\15470000 ( Direct expense: \11900000 、 Indirect expense:\3570000 )

    Dielectric and magnetodielectric properties in “electronic ferroelectoricity” were examined. In particular, large spacial and temporal dielectric fluctuations and correlation between magnetic and electric dipole moments were focused on. We revealed mainly large dielectric fluctuation in a geometrical frustrated lattice, a linear magnetodielectric effect in dimer-type organic molecular solids, and melting of the magnetic long range order due to dielectric fluctuations.

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  • Search for superconducting phase in electronic ferroelectric iron oxides

    Grant number:25620071  2013.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Yoshii Kenji, KOBAYASHI Tatsuo, YONEDA Yasuhiro, SAITOH Hiroyuki, FUKUDA Tatsuo, MATSUMURA Daiju, IKEDA Naoshi

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    Grant amount:\4030000 ( Direct expense: \3100000 、 Indirect expense:\930000 )

    We have searched for a superconducting phase in electronic ferroelectric multiferroic RFe2O4 (R: rare earths). Electrical resistivity measurements were performed under high pressures up to 4 GPa to increase the interactions between the Fe ions inside the Fe-O plane. Although the pressure was raised up to 4 GPa, the system remained semiconducting. However, a slight change was observed for YFe2O4 around 1-2 GPa; the activation energy was slightly decreased at higher pressures. Also, the elemental substitution at R site was attempted. We found that the magnetic transition temperature (250 K) was increased by 5-10 K by the substitution of the large R3+ ion (Dy3+). This result is interesting from the viewpoint of a search for room temperature multiferroic materials.

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  • Search for a new phase of multiferroic ferroelectric RFe2O4 aimed at practical applications

    Grant number:23350071  2011.04 - 2014.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    YOSHII Kenji, HIROYUKI Saitoh, NAOSHI Ikeda, DAIJU Matsumura, YUJI Muraoka, SHIGEO Mori, YASUHIRO Yoneda, YASUO Nishihata

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    Grant amount:\11180000 ( Direct expense: \8600000 、 Indirect expense:\2580000 )

    In search of multiferroiciity at room temperature, we have conducted the research work on electronic ferroelectric RFe2O4 (R: rare earths). The magnetic transition temperature was not drastically changed by a few kinds of attempts, such as R- and Fe-sites substitutions. However, it was found that the related system R2Fe3O7 shows a magnetic transition at 270 K, which is 20 K higher than that of RFe2O4. As R2Fe3O7 was reported to be ferroelectric at room temperature, this system is multiferroic below 270 K. This result offers a possible increase in transition temperature up to room temperature. In addition, we have revealed several new phenomena of RFe2O4, such as exchange bias and enhancement anisotropy induced by electrical current, which may be used to fabricate new multiferroic devices.

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  • Study of non local optical process in soft x-ray region

    Grant number:23540382  2011 - 2013

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    AGUI Akane, IKEDA Naoshi

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    Grant amount:\5460000 ( Direct expense: \4200000 、 Indirect expense:\1260000 )

    The crystal structure of LuFe2O4 has the alternate staking of triangular lattices of rare-earth elements, iron, and oxygen. The charge ordering of Fe2+ and Fe3+ ions in LuFe2O4 induces ferroelectricity below 330 K (Tco: charge order temperature). Above Tco, the three dimensional charge order changes into the two dimensional. In this study, the temperature dependence and polarization dependence of the X-ray emission spectra (XES) at Fe 2p-edge was investigated in order to study electric states in charge order state and charge disorder state. It was found that, in charge order state, Fe 2p edge -XES showed not only local optical process on each Fe2+ and Fe3+ site but also a non-local optical process between the Fe2+ and Fe3+ sites. It was found that the process was clear in plane direction. And more the non-local aspect was not clear in the charge disordered state.

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  • Observation of Charge 0rdering in Organic Dielectric Compounds using Time Resolved Synchrotron Radiation

    Grant number:21540323  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    NOGAMI Yoshio, IKEDA Naoshi

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    Grant amount:\4550000 ( Direct expense: \3500000 、 Indirect expense:\1050000 )

    Organic thyristor showing giant non-linear conduction leading particular DC-AC current conversion was caused by the melting of the charge ordering by electronic current. Since, the charge ordering can produce organic dielectric materials, the realization of melting and reordering process of the charge ordering is very important to develop organic ferroelectrics. We observed variation of the two competing charge ordering and the time constant of melting and freezing for two fold charge ordering is more than several ten msec using Synchrotron Radiation under current.

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  • Peculiar dielectric behavior in rare earth-transition metal oxides

    Grant number:20550134  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    KENJI Yoshii, IKEDA Naoshi, YONEDA Yasuhiro

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    Grant amount:\4940000 ( Direct expense: \3800000 、 Indirect expense:\1140000 )

    We have reported the dielectric behavior of an electronic origin in RFe_2O_4-derived materials and perovskite manganese oxides ; this origin is entirely different from the ordinary ion-displacement mechanism. Such dielectric materials can be used for the fabrication of fatigue-free devices. In addition, some of these materials show high dielectric constants and can be prepared in a simple solid state method in air, the properties which are favorable to application.

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  • Creation of ferromagnetic ferroelectrics based on chiral one-dimensional metal complexes.

    Grant number:20550130  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    MITSUMI Minoru, IKEDA Naoshi

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    Grant amount:\4810000 ( Direct expense: \3700000 、 Indirect expense:\1110000 )

    Multiferroic materials exhibiting ferromagnetic and ferroelectric properties have attract much attention because of the control of a magnetism by an electric field and/or the control of an electric polarization by a magnetic field. To realize such a system, we have synthesized four new chiral rhodium(I)-semiquinonato complexes 1-4 by using chiral semiquinonato ligands. Magnetic studies revealed that the complex molecules in the compound 1 and 2 form triplet dimer in the linear chain, and the magnetic interaction between the triplet dimers changes from antiferromagnetic in the room temperature phase to ferromagnetic in the low temperature phase with the phase transition. Ac magnetic susceptibility shows a two-step magnetic anomaly below 8 K.

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  • Magnetoelecric relaxors

    Grant number:20340078  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    MORI Shigeo, IKEDA Naoshi

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    Grant amount:\19370000 ( Direct expense: \14900000 、 Indirect expense:\4470000 )

    We have investigated magnetic and dielectric properties and related microstructures in (1-x)BiFeO_3-xBaTiO_3 solid solution using a transmission electron microscopy (TEM), in combination with conventional magnetic and dielectric measurements. Nano-sized domain structures in the cubic phase of (1-x)BiFeO_3-xBaTiO_3 with 0.33<x<0.60 were found. From high-resolution TEM observation, it is revealed that the cubic phase in 0.33<x<0.60 is characterized as nano-scaled coexisting state of the polar rhombohedral structure and the non-polar cubic one, which should be regarded as the psudo-cubic phase. On the other hand, both P-E hysteresis measurements and the TEM experiments revealed that the cubic phase without any distortion due to the coexisting state appears in the x=0.60 compound at room temperature. Our experimental findings suggested that (1-x)BiFeO_3-xBaTiO_3 is a good candidate materials showing a gigantic magnetoelectric effect as a magnetoelectric relaxor.

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  • Cross correlation between charge and magnetism in molecular materials

    Grant number:19540341  2007 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    HANASAKI Noriaki, IKEDA Naoshi, NOGAMI Yoshio

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    Grant amount:\4420000 ( Direct expense: \3400000 、 Indirect expense:\1020000 )

    フタロシアニン分子を主な研究対象として、π電子系の電荷自由度と遷移金属のd電子系の電子スピン自由度に着目した新しい誘電物性を開拓することを目的とした。本研究において、フタロシアニン分子系物質で磁場印加による誘電率の急激な上昇を観測することに成功した。さらに、格子定数に対して2倍の周期を有するπ電子系の電荷秩序構造をX線回折で発見し、本物質の絶縁化が電子相関効果に起因することを明らかにした。

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  • 強相関有機誘電体の電荷秩序の直接観測

    Grant number:18654055  2006 - 2007

    日本学術振興会  科学研究費助成事業  萌芽研究

    野上 由夫, 池田 直

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    Grant amount:\3400000 ( Direct expense: \3400000 )

    本年度は,有機伝導体θ-(BEDT-TTF) 2CsM (SCN) 4 (M=Co, Zn)の巨大非線形伝導と電荷秩序の局所構造との関係を精密構造解析によって明らかにした。この物質は,3桁におよぶ巨大な非線形伝導と,ダイオードを2個連結したサイリスタ素子と同じ電流-電圧特性を示すため,我々は有機サイリスタと呼んだ(Nature 437 (2005) 522)。これは本質的な電流によって引き起こされた,非平衡現象であるとともに,全く新しいデバイス物理の芽を提案している。
    有機サイリスタ結晶にパルス電流を通電しつつ,ミリ秒オーダーの時間分解X線回折を行い,電荷秩序融解のダイナミクスを明らかにすることを試みた。この結果電荷秩序の融解は約50msec,再凍結は100msec以上で起こっており,これは有機サイリスタとしての発振周波数40Hzと整合する。またこの系の場合はBEDT-TTF分子がわずかに回転することによってクーロン斥力を減らそうとする(J. Phys. Soc. Jpn. 74 (2005) 2011)。したがって,電荷秩序が融解すれば分子の回転ももとに戻るはずである。このような電流-格子結合が実際にこの系で観測された。ブラッグ反射の電流依存性を詳細に測定することによって,格子は電流に比例して変化することがわかった。格子の変形は数mA(1V以下の電圧)で0.01%に達する。このときピエゾ定数(歪み量を電圧で割った量)は圧電材料PZTの1000倍以上に達する。この効果は電流によって電荷秩序が融解する効果であるから,歪みは電流の向きによらない。

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  • Charge order in the mixed valence oxide Fe_2BO_4

    Grant number:18540356  2006 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    NAKAMURA Shin-ichi, IKEDA Naoshi, SHIMOMURA Susumu, OKAWA Kenichi, MORI Shigeo

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    Grant amount:\3850000 ( Direct expense: \3700000 、 Indirect expense:\150000 )

    We have investigated the crystal structure and the charge order of mixed valence oxide Fe_2BO_4 by synchrotron X ray diffraction, neutron diffraction, ele diffraction, and Mossbauer spectroscopy. Our results are summarized as follows ;
    1)Preparation of the specimens : Polycrystalline, polycrystalline containing "B isotope, and single crystal were prepared.
    2)Evaluation of the charge order and magnetic structure by Mossbauer spectroscopy : By the quadrupole effect, we examined the reported charge order patten concluded that the pattern or the structure parameters might be wrong. We also examined the magnetic structure by applying external magnetic field a temperatures, and found that the magnetic structure is parasitic one (canted or spiral).
    3) Diffraction measurements using polycrystalline : In the synchrotron X ray diffraction, we could not fined superstructure reflections corresponding to the dot of the unit cell along the a-axis. We found, however, an anomalous temperature dependence of the lattice parameters around the transition temperature. C other hand in neutron diffraction, we found some weak superstructure reflections. Assuming a tentative space group, we could see a difference in bond valenci of Fe-O in each Fe site, which may be indicative of a charge order. We also found that the B parameters are elongated along the a-axis.
    4)Transmission electron microscope using single crystal : We found at room temperature clear superstructure reflections corresponding to the doubling of th cell along the a-axis. With the increase of temperature, the reflections become incommensurate, and finally disappear.
    We are intending to investigate further to determine the space group and the charge order pattern, together with the magnetic structure.

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  • Ferroelectrics of charge ordering type and its non-linear response in triangular mixed valence iron oxide

    Grant number:18340094  2006 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    IKEDA Naoshi, MORI Shigeo, YOSHII Kenji

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    Grant amount:\15710000 ( Direct expense: \15200000 、 Indirect expense:\510000 )

    We made a research for triangular mixed valence material RFe2O4 which exhibits a polar charge ordering from the frustrated charge interaction. In this two years we had built up an air tight furnace having sample weight measurement system. From the detailed information of the sample weight change during the various heat treatment, we developed couple of method in obtaining fine sample of RFe2O4. During the course of the research we found the various electronic phases and properties for YbFe2O4, RFeCoO4, RFeCuO4 and RGaCuO4 (R.= Yb, Lu)
    Recently the ferroelectricity arise from the polar ordering of electrons have got much attention, however the usability for the actual application on the ferroelectric material have still been an open question. For example high electronic conductivity that possibly exist in the correlated electron system may prevent the usual application for the ferroelectrics like as insulator, charge condenser and so on. This report is one of the possibility search for such quests. For example in some sample treatment condition can possibly realize a high resistivity states of electronic ferroelectrics. It is also interesting that the sample having less oxygen vacancy shows high activation energy than non-stoichiometric material. It has been explained that the origin of the dielectric dispersion for Rfe_2O_4 is the boundary motion for polar domains. The higher Q value for higher stoichiometric sample indicates that the less oxygen vacant sample has larger charge ordering coherence length. Which realizes lamer scale of the collective electron motion.
    We emphasize that such ferroelectricity, defined by the electron distribution, is crucially different from previously known ferroelectrics. The difference in the origin of ferroelectricity may enable the development of a new class of device application in the near future. For example an anomaly report exists in electron microscope observation, which revealed an extremely small ferroelectric domain having a coherent size of 10 nm scale. This is a consistent estimate from the X-ray diffraction experiments. The superlattice profile is wider than the fundamental Bragg spot. Using the Schemer's formula the coherence length was estimated as about 10 nm from the full width of the half maximum of the peak profile in the a-b plane. In this ferroelectric the Coulomb interactions between Fe^<3+> and Fe^<2+> dominate the total energy for the presence of the domain sizes, that is decoupled from the lattice distortion. This indicates a typical property of the ferroelectricity by ordered electrons, free of lattice distortion. Future study may reveal such an extremely small ferroelectric element in high density electric devices in such extremely small domains.
    The applicability of electronic ferroelectric material for conventional ferroelectrics is still an open question. We should continue to find out better method to realize high stoichiometric RFe_2O_4, or also we should find out more characteristic application that may suit for such material having electric polarization and good conductivity.

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  • Multiferoic properties of rare-earth iron oxides with frustrated charge interactions

    Grant number:18550136  2006 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    YOSHII Kenji, IKEDA Naoshi, MORI Shigeo, YONEDA Yasuhiro

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    Grant amount:\4120000 ( Direct expense: \3700000 、 Indirect expense:\420000 )

    The magnetic and dielectric properties of YbFe_2O_4 have been investigated., as its dielectric properties have not been reported so far The material showed a magnetic transition temperature of 250 K and dielectric constants of about 10000, both of which are close to those of the other RFe_2O_4 oxides (R: rare earths). This oxide can be prepared from the low-cost starting material of Yb_2O_3; accordingly, YbFe_2O_4 is suitable for practical application
    We have also started a research to find the optimum synthesis condition of YbFe_2O_4 changing a CO/CO_2 flow ratio. This study is currently under way mainly by magnetization measurements.
    In addition, the magnetic and dielectric properties of the Fe-site substituted oxides have been investigated. It was found that the dielectric constant was decreased in the order of RFe_2O_4, RFeCoO_4, RFeCuO_4, and RGaCuO_4. In consideration of the results from magnetic measurements, this result was explained in connection with the electron transfer between the Fe-site ions. Thus, we proposed that the dielectric response of the RFe_2O_4-type oxides has the origin different from that of ordinary ferroelectrics and dielectrics, in which the displacement of cations and anions plays a central role.
    Electron transfer was found to be likely important in a few other transition-metal oxides, such as R_2RuNiO_6 and R_<0.5>Ca_<0.5>MnO_3 (R; rare earths). In the latter system, the activation energy in the dielectric response was close to that of the transfer of Mn-3d electrons, suggesting a correlation between the dielectric response and the electron transfer.
    It was also found that these oxides showed small activation energies to rotate the polar retions. This fact implies that their dielectric response is weakly coupled to the lattice distortion, and offers a possibility of fabricating fatigue-free devices using these materials.

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  • 分子性導体の電荷配列の極低温及び強磁場下X線による観測

    Grant number:15073217  2003 - 2007

    日本学術振興会  科学研究費助成事業  特定領域研究

    野上 由夫, 大嶋 孝吉, 神戸 高志, 池田 直

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    Grant amount:\66100000 ( Direct expense: \66100000 )

    世界で初めてとなる,超高感度10T磁場下回折装置と磁場中散漫散乱カメラを用いて,磁場下で量子ホール効果示す低次元物質η-Mo4011のX線散漫散乱写真を撮影した。6Kの極低温下では,二種類の電荷密度波転移の内,比較的振幅の大きなCDW1形成に伴う衛星反射だけではなく,特に微弱なCDW2形成に伴う衛星反射を観測する事に成功した。同一の写真に10ヶ以上の反射の撮影に成功しており,これは低温用X線カメラとしても世界最高性能であることを示している。更に8T以上の強磁場でCDW2の衛星反射位置が一次元方向b*成分に大きく変化することを観測した。この磁場領域では磁気輸送や磁場下光学特性にも異常があらわれることと考えあわせると,磁場による電子状態の変化が引き起こされていると考えられる。この装置は低次元分子性導体のような,様々な波数,つまり予測不能な波数の変調構造が現れ,それが電子状態に大きな影響を及ぼす系の構造科学研究にとって不可欠である。更に,EuO. 6SrO. 4MnO3の絶縁体-金属転移に関連し,同じく世界初となる高感度磁場中回転カメラ用いて磁場中冷却の金属相では,磁場なし冷却の絶縁相とくらべ,格子が明瞭に変化していることを観測した。つまり,磁場により格子の歪みが少ない金属相が安定となることを示した。これはこの系の物性が基本的に二重交換相互作用に支配されていることを示している。極低温で2種類の電荷秩序が競合するθ-(BEDT-TTF)2CsZn(SCN)4では,高電場下で巨大な非線形伝導やサイリスタ動作と関連し,3倍の電荷変調は変化しないが,2倍の電荷変調が減少すること,さらにその電荷変調の消長に格子定数の変化が同期していることを見いだした。

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  • Successive Transition of Polaron Phases in Triangular Charge Competing System YFe_2O_4

    Grant number:15540324  2003 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    IKEDA Naoshi, MORI Shigeo

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    Grant amount:\3600000 ( Direct expense: \3600000 )

    In a series of oxides RFe_2O_4 (R=rare earth between Dy and Lu, or Y), equal numbers of Fe^<2+> and Fe^<3+> are located on a layer composed of two triangular nets stacked together. These oxides have several phase transitions where the arrangement of Fe^<2+> and Fe^<3+> ions transforms from one type to another. Unique dielectric properties of these oxides have been explained in connection with the charge ordering.
    We made a research of low oxygen deficient YFe_2O_4 in which the charge frustration effect is considered to be dominant. We gave a discussion that the possible origin of the successive transition of the superstructure arose from the competition between the nearest neighbor and next nearest neighbor interaction of charges in triangular plane. We had synthesized the low oxygen deficient YFe_2O_4 with a furnace which equipped an electric circuit system which control an oxygen partial pressure. A synchrotron radiation X-ray diffraction, transmission electron microscope experiment revealed that, stoichiometric YFe_2O_4, the superstructure of the Fe^<2+> and Fe^<3+> order transformed into a triple, double, quadruple and septenary charge structure in the temperature range from room temperature to 130 K. A slow relaxation of the superstructure was found at 130 K. Time dependence of the magnetic moment was observed at about 240 K to suggest a similar relaxation.
    By a transmission electron microscopy observation for YFe_2O_4, a characteristic diffuse scattering elongated along the [001] direction through the (1/3 1/3 0)-type reciprocal positions was found at RT, which is related to the micro domains due to the CO with a size of 10-20nm. In addition, it was also found that the superlattice structures characterized by (1/3-・1/3-・0)-type modulation vector, which should be due to the vacancy ordering, coexist with the microdomains due to the CO. On the other hand, in stoichimetric YFe_2O_4, we found temperature variations of the superlattice structures on warming from 100 K, which should be strongly related to the dielectric anomalies in YFe_2O_4.
    A resonant X-ray diffraction revealed that the charge superstructure is originated from the long range ordering of Fe^<2+> and Fe^<3+> in triangular plane.
    In addition to the above researches we made a structure analysis of topological crystal. And we made some researches in which a coupling between charge and spin of transition metal d-electron plays a central role to drives a lattice distortion or phase transition.

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  • 三角格子上に発現する電荷秩序構造と新しい誘電性

    Grant number:09740251  1997 - 1998

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    池田 直

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    Grant amount:\2500000 ( Direct expense: \2500000 )

    今年度,LuFe_2O_4について,中性子線散乱並びに,放射光を用いたX線異常分散による解析を行った.その結果判明した事柄を列記する.
    (i)RFe_2O_4の電荷秩序構造は自発分極を持っており,この物質は誘電体として振る舞う.誘電率は10^4のオーダーと大きく,鉄イオン間の電子移動に伴い分極の反転が起こる.
    (ii)この物質は,電荷の秩序に関して高温から,無秩序状態→二次元電荷密度波(CDW)状態→三次元CDW状態と逐次転移をする.
    (iii)約500K以下で現れる二次元CDW状態は,三角格子の面内で波数(1/3 1/3)で伝播する電荷の波で記述される.誘電的見地から見ると電荷移動の性質からこの相は二次元強誘電相のランダムな積層状態と見ることができる.
    (iv)350K以下に現れる三次元CDW状態では層間の位相が逆位相,したがって全体として反強誘電相となっている可能性がある.これに加えて面内の秩序も長周期の変調を受けた不整合相となる.
    現在,放射光を用いた鉄イオンK殻吸収端近傍でのX線異常分散による結晶構造解析により,室温で存在している鉄イオンの電荷秩序配列の電子密度分布を求めることを試みている.

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  • 酸化希土類鉄(II,III)の電荷-スピン秩序とその緩和

    Grant number:08640469  1996 - 1998

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    近 桂一郎, 池田 直

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    Grant amount:\2400000 ( Direct expense: \2400000 )

    前年度に引き続いて,Fe^<2+>,Fe^<3+>の電荷秩序とその緩和に関する知見を得るねらいで,LuFe_2O_4の誘電緩和の精密測定を行った.とくに装置を改良して,測定周波数を10Hz域に拡張するとともに,3次応答の測定を可能にした.あわせて,焦電気効果による自発分極の測定を始めた.また,池田は山田安定(早大理工総研)らと協力して,X線の異常分散を利用する回析実験を行い,3次元電荷秩序についての直接的な証拠を得た.また,3次元電荷秩序による自発分極を巨視的な測定で確認した.
    これらの結果とこれまでの結果をまとめて,以下の結論に達した.
    1)150-200Kに特徴的に現れる誘導分散は,3次元電荷秩序相内の長周期構造間の境界の移動で説明できる.
    2)320K移転の直上では誘電率の極大が現れる.その温度と測定周波数の間の関係は緩和時間の広い分布を特徴とする.
    3)2)に加えて,転移温度領域に非線型誘電率の極大が現れる.
    4)2,3)は転移温度よりも高温の領域から存在する,局所的な分極の凍結で説明できる.以上について,論文を執筆し,J.Phys.Soc.Jpn.に投稿した.

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  • 酸化希土類マンガン(III、IV)の強誘電性-反強磁性同時相転移

    Grant number:04452046  1992 - 1994

    日本学術振興会  科学研究費助成事業  一般研究(B)

    近 桂一郎, 池田 直

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    Grant amount:\6100000 ( Direct expense: \6100000 )

    1.同形の構造を持つ希土類マンガン酸化物RMn_2O_5(R=Sm-Luの希土類,Y,またはBi)の低温相転移を詳しく調べ,この系の酸化物が約40K以下の領域で一連の逐次相転移をすることを明らかにした.一般に,それらは以下の順序で起こる.(a)らせん磁気秩序の形成,(b)強誘電性自発分極の出現,(c)らせん磁気秩序の変形(スピン再配列),(d)希土類イオンの磁気モーメントの整列.
    2.当初,EuMn_2O_5で予想した,(a)と(b)とが同時に起こる相転移の存在はまだ確認していない.しかし,二つの相転移のが近接した二つの温度に存在するようである.Euに次いでこのような転移の可能性が高いと考えていたYMn_2O_5では,二つの別の転移の存在することを確認した.
    3.R=Gdの場合を除いて,自発分極の温度変化は複雑であり,その起因は,複数個の副格子のイオン変位によるフェリ誘電性であると考えている.
    4.YbMn_2O_5の6Kの相転移では,Yb^<3+>の磁気モーメントの整列と付加的な自発分極の出現が同時に起こっていることを示した.この系では,きわめて異方的なYb^<3+>イオンの磁気モーメントの整列が,格子の変形とそれにともなう新たな分極を誘導すると考えている.
    以上の結果は,印刷中を含め6編の論文で公表した.さらに2編の論文を準備中である.
    この研究の結果は,微視的な構造の解析によって,より直接的に検証する必要がある.目下,TbMn_2O_5単結品の中性子回折および精密なX線回折の実験を準備している.

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  • 位相補償型複素磁化率測定によるスピングラスの非線形応答パワースペクトル

    Grant number:04740179  1992

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    池田 直

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    Grant amount:\900000 ( Direct expense: \900000 )

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