Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
External link
KONDO Ryusuke
Degree
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Ph.D. ( The University of Tokyo )
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a Master of Engineering ( The University of Tokyo )
Research Interests
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極限下（低温・強磁場・高圧縮（静水圧・一軸性））の物性測定・構造解析
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band-filling of topological materials
Research Areas
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Natural Science / Magnetism, superconductivity and strongly correlated systems
Education
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東京大学大学院 総合文化研究科広域科学専攻 相関基礎科学系
1996.4 - 1998.2
Country： Japan
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東京大学大学院 工学系研究科 物理工学専攻
1994.4 - 1996.3
Country： Japan
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The University of Tokyo 工学部 物理工学科
1990.4 - 1994.3
Research History
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Okayama University The Graduate School of Natural Science and Technology Associate Professor
2012.1
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The University of Tokyo Graduate School of Arts and Sciences, Basic Science,Section of Multi-Disciplinary Sciences, Assistant Professor
2007.4 - 2011.12
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The University of Tokyo Graduate School of Arts and Sciences, Basic Science,Section of Multi-Disciplinary Sciences, Research Assistant
1998.2 - 2007.3
Professional Memberships
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日本物理学会
Papers
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Structural and Superconducting Properties of Bi2Rh3(Se1–xSx)2 (x = 0–1.0) Reviewed
Zhiyan Zhang, Wanli Pan, Masaki Utsumi, Yuki Yamamoto, Hidenori Goto, Ryusuke Kondo, Takayoshi Yokoya, Ryota Goban, Tomoki Higashikawa, Ritsuko Eguchi, Yasuhiro Takabayashi, Koichi Hayashi, Hirofumi Ishii, Tatsuo C. Kobayashi, Yoshihiro Kubozono
Inorganic Chemistry 63 ( 45 ) 21531 - 21540 2024.10
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Control of Polar/Antipolar Layered Organic Semiconductors by the Odd‐Even Effect of Alkyl Chain Reviewed
Satoru Inoue, Toshiki Higashino, Kiyoshi Nikaido, Ryo Miyata, Satoshi Matsuoka, Mutsuo Tanaka, Seiji Tsuzuki, Sachio Horiuchi, Ryusuke Kondo, Ryoko Sagayama, Reiji Kumai, Daiki Sekine, Takayoshi Koyanagi, Masakazu Matsubara, Tatsuo Hasegawa
Advanced Science 11 ( 13 ) 2024.1
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Zhiyan Zhang, Mitsuki Ikeda, Masaki Utsumi, Yuki Yamamoto, Hidenori Goto, Ritsuko Eguchi, Yen-Fa Liao, Hirofumi Ishii, Yasuhiro Takabayashi, Koichi Hayashi, Ryusuke Kondo, Tatsuo C. Kobayashi, Yoshihiro Kubozono
Inorganic Chemistry 63 ( 5 ) 2553 - 2561 2024.1
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Shunto Arai, Satoru Inoue, Mutsuo Tanaka, Seiji Tsuzuki, Ryusuke Kondo, Reiji Kumai, Tatsuo Hasegawa
Physical Review Materials 7 ( 2 ) 2023.2
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Satoshi Matsuoka, Kazuma Ogawa, Ryota Ono, Kiyoshi Nikaido, Satoru Inoue, Toshiki Higashino, Mutsuo Tanaka, Jun'ya Tsutsumi, Ryusuke Kondo, Reiji Kumai, Seiji Tsuzuki, Shunto Arai, Tatsuo Hasegawa
Journal of Materials Chemistry C 10 ( 43 ) 16471 - 16479 2022
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Spin Dynamics in the Mixed Stack Charge Transfer Complex, (BEDO-TTF)(Cl2TCNQ) Reviewed
Ko-ichi Hiraki, Masashi Takahashi, Toshihiro Takahashi, Tatsuo Hasegawa, Ryusuke Kondo, Seiichi Kagoshima
Journal of the Physical Society of Japan 89 ( 7 ) 074706 - 074706 2020.7
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Multiple charge density waves compete in ternary rare-earth nickel carbides,RNiC2(R: Y, Dy, Ho, and Er) Reviewed
Hiroyuki Maeda, Ryusuke Kondo, Yoshio Nogami
PHYSICAL REVIEW B 100 104107 2019.9
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Possible charge order structure of stoichiometric YbFe2O4 Reviewed
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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Interplay of Charge-Density Wave and Magnetic Order in Ternary Rare-Earth Nickel Carbides, RNiC2 (R = Pr and Nd) Reviewed
Nobuki Yamamoto, Ryusuke Kondo, Hiroyuki Maeda, Yoshio Nogami
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 82 ( 12 ) 2013.12
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Reproducible synthetic method for the topological superconductor CuxBi2Se3 Reviewed
Ryusuke Kondo, Taiki Yoshinaka, Yoshinori Imai, Atsutaka Maeda
Journal of the Physical Society of Japan 82 ( 6 ) 2013.6
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Superconductivity at 5.4 K in beta-Bi2Pd Reviewed
Yoshinori Imai, Fuyuki Nabeshima, Taiki Yoshinaka, Kosuke Miyatani, Ryusuke Kondo, Seiki Komiya, Ichiro Tsukada, Atsutaka Maeda
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 81 ( 11 ) 2012.11
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Ultrafast photo-induced insulator-to-metal transition in the spin density wave system of (TMTSF)(2)PF6 Reviewed
Shinichi Watanabe, Ryusuke Kondo, Seiichi Kagoshima, Ryo Shimano
PHYSICA B-CONDENSED MATTER 405 ( 11 ) S360 - S362 2010.6
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Electronic states of organic quasi-two dimensional conductor beta ''-(DODHT)(2)PF6 center dot Charge ordering and superconductivity Reviewed
M. Higa, R. Kondo, A. Murata, S. Kagoshima, H. Nishikawa, K. Yakushi
PHYSICA B-CONDENSED MATTER 405 ( 11 ) S172 - S175 2010.6
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Interplay of charge-density waves and superconductivity in the organic conductor beta ''-(BEDT-TTF)(2)AuBr2 Reviewed
Ryusuke Kondo, Momoka Higa, Seiichi Kagoshima, Noriaki Hanasaki, Yoshio Nogami, Hiroyuki Nishikawa
PHYSICAL REVIEW B 81 ( 2 ) 024519 2010.1
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Observation of ultrafast photoinduced closing and recovery of the spin-density-wave gap in (TMTSF)(2)PF6 Reviewed
Shinichi Watanabe, Ryusuke Kondo, Seiichi Kagoshima, Ryo Shimano
PHYSICAL REVIEW B 80 ( 22 ) 2009.12
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Effects of Hydrostatic Pressure and Uniaxial Strain on Spin-Peierls Transition in an Organic Radical Magnet, BBDTA center dot InCl4 Reviewed
Masaki Mito, Seiichiro Kawagoe, Hiroyuki Deguchi, Seishi Takagi, Wataru Fujita, Kunio Awaga, Ryusuke Kondo, Seiichi Kagoshima
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 78 ( 12 ) 2009.12
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Crystal and Electronic Structures of the Quasi-Two-Dimensional Organic Conductor alpha-(BEDT-TTF)(2)I-3 and Its Selenium Analogue alpha-(BEDT-TSeF)(2)I-3 under Hydrostatic Pressure at Room Temperature Reviewed
Ryusuke Kondo, Seiichi Kagoshima, Naoya Tajima, Reizo Kato
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 78 ( 11 ) 2009.11
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Ultrafast terahertz probe of spin-density wave dynamics in organic conductor (TMTSF)(2)PF6 Reviewed
S. Watanabe, R. Kondo, S. Kagoshima, R. Shimano
2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5 2993 - + 2009
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Spin-density-wave gap in (TMTSF)(2)PF6 probed by reflection-type terahertz time-domain spectroscopy Reviewed
Shinichi Watanabe, Ryusuke Kondo, Seiichi Kagoshima, Ryo Shimano
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS 245 ( 12 ) 2688 - 2691 2008.12
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Charge ordered insulating phases of DODHT salts with octahedral anions and a new radical salt, β″-(DODHT)2TaF6
H Nishikawa, H Oshio, M Higa, R Kondo, S Kagoshima, A Nakao, H Sawa, S Yasuzuka, K Murata
Journal of Physics: Conference Series 132 012023 - 012023 2008.10
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Hump like resistance anomaly in organic conductor beta ''-(BEDT-TTF)(2)CsCd(SCN)(4) Reviewed
Ryusuke Kondo, Jun Otsuji, Seiichi Kagoshima, Yoshio Nogami
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 ( 6 ) 2008.6
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Charge ordered metal and pressure-induced superconductivity in the two-dimensional organic conductor beta-(DODHT)(2)PF(6) Reviewed
Akito Kobayashi, Yoshikazu Suzumura, Momoka Higa, Ryusuke Kondo, Seiichi Kagoshima, Hiroyuki Nishikawa
JOURNAL OF PHYSICS-CONDENSED MATTER 20 ( 12 ) 2008.3
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Development of uniaxial elongation method and its application to low dimensional conductors Reviewed
Hiroki Kowada, Ryusuke Kondo, Seiichi Kagoshima
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 76 ( 11 ) 2007.11
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Structural studies of pressure-induced organic superconductor beta ''-(DODHT)(2)PF6 having charge-ordering phase at ambient pressure Reviewed
Momoka Higa, Ryusuke Kondo, Seiichi Kagoshima, Hiroyuki Nshikawa
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 76 ( 3 ) 2007.3
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A possible internal deformation of the charge ordering and its meta-stability in the organic conductor theta-(BEDT-TTF)(2)CsZn(SCN)(4) Reviewed
Ryusuke Kondo, Mornoka Higa, Seiichi Kagoshima
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 76 ( 3 ) 2007.3
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Anisotropic superconducting transition in beta ''-(DODHT)(2)PF6 Reviewed
Momoka Higa, Ryusuke Kondo, Seiichi Kagoshima, Hiroyuki Nishikawa
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 76 186 - 187 2007.1
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Ultrahigh-pressure effects in metallo-organics Reviewed
Seiichi Kagoshima, Ryusuke Kondo, Nobuyuki Matsushita, Momoka Higa, Sergey V. Ovsyannikov, Nadezhda A. Shaydarova, Vladimir V. Shchennikov, Andrey Y. Manakov, Anna Y. Likhacheva
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS 244 ( 1 ) 418 - 423 2007.1
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High-pressure research in organic conductors Reviewed
Keizo Murata, Seiichi Kagoshima, Syuma Yasuzuka, Harukazu Yoshino, Ryusuke Kondo
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 75 ( 5 ) 2006.5
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A one-dimensional coordination polymer, BBDTA center dot InCl4: Possible spin-Peierls transition with high critical temperature of 108 K Reviewed
Wataru Fujita, Kunio Awaga, Ryusuke Kondo, Seiichi Kagoshima
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 128 ( 18 ) 6016 - 6017 2006.5
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Electrical and structural properties of theta-type BEDT-TTF organic conductors under uniaxial strain Reviewed
R Kondo, M Higa, S Kagoshima, H Hoshino, T Mori, H Mori
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 75 ( 4 ) 044716 2006.4
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Superconducting and charge ordering phases of two-dimensional organic conductors Reviewed
R. Kondo, M. Higa, S. Kagoshima
JOURNAL OF LOW TEMPERATURE PHYSICS 142 ( 3-4 ) 535 - 538 2006.2
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Magnetic correlation in BETS2(Cl(2)TCNQ) Reviewed
Y. Takano, K. Hiraki, T. Takahashi, R. Kondo, S. Kagoshima, T. Hasegawa, T. Mocihda, Y. Iwasa
JOURNAL OF LOW TEMPERATURE PHYSICS 142 ( 3-4 ) 647 - 650 2006.2
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Ultra high pressure application to organic conductors Reviewed
S. Kagoshima, R. Kondo, N. Matsushita, S. V. Ovsyannikov, N. A. Shaidarova, V. V. Shchennikov
JOURNAL OF LOW TEMPERATURE PHYSICS 142 ( 3-4 ) 409 - 412 2006.2
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Charge ordered insulating state in DODHT salts Reviewed
H. Nishikawa, Y. Sato, T. Kodama, K. Kikuchi, I. Ikemoto, J. Yamada, H. Oshio, R. Kondo, S. Kagoshima
JOURNAL OF LOW TEMPERATURE PHYSICS 142 ( 3-4 ) 633 - 636 2006.2
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Magneto-transport properties in the density wave phase of beta ''-(BEDT-TTF)(2)CsCd(SCN)(4) Reviewed
R. Kondo, J. Otsuji, S. Kagoshima
YAMADA CONFERENCE LX ON RESEARCH IN HIGH MAGNETIC FIELDS 51 327 - + 2006
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Structural and electronic properties of a new molecular conductor, alpha-(BEDT-TTF)(2)CsCd(SCN)(4) Reviewed
R Kondo, M Higa, S Kagoshima
SOLID STATE COMMUNICATIONS 137 ( 12 ) 637 - 640 2006
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M. Kimata, H. Ohta, K. Koyama, M. Motokawa, R. Kondo, S. Kagoshima, H. Tanaka, M. Tokumoto, H. Kobayashi, A. Kobayashi
YAMADA CONFERENCE LX ON RESEARCH IN HIGH MAGNETIC FIELDS 51 359 - + 2006
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Crystal structure analysis under uniaxial strain at low temperature using a unique design of four-axis x-ray diffractometer with a fixed sample Reviewed
R Kondo, S Kagoshima, J Harada
REVIEW OF SCIENTIFIC INSTRUMENTS 76 ( 9 ) 093902 2005.9
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Charge ordering and pressure-induced superconductivity in beta ''-(DODHT)(2)PF6 Reviewed
H Nishikawa, Y Sato, K Kikuchi, T Kodama, Ikemoto, I, J Yamada, H Oshio, R Kondo, S Kagoshima
PHYSICAL REVIEW B 72 ( 5 ) 052510 2005.8
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Molecular arrangement and electronic band structure of theta-(BEDT-TTF)(2)CsZn(SCN)(4) controlled by uniaxial compression Reviewed
R Kondo, M Higa, S Kagoshima, H Hoshino, T Mori, H Mori
CURRENT APPLIED PHYSICS 4 ( 5 ) 484 - 487 2004.8
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Phase transition on (BEDO-TTF) (Cl(2)TCNQ): Spin dynamics observed by NMR measurements Reviewed
M Takahashi, K Hiraki, T Takahashi, T Hasegawa, R Kondo, S Kagoshima
JOURNAL DE PHYSIQUE IV 114 141 - 142 2004.4
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Crystal and electronic structures of alpha-(BEDT-TTF)(2)I-3 under uniaxial strains Reviewed
R Kondo, S Kagoshima
JOURNAL DE PHYSIQUE IV 114 523 - 525 2004.4
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2k(F) transitions in a series of (DMET)(2)(X(1)X(2)TCNQ) (X(1), X(2)=Br, Cl, F, CH(3), H): Subsidiary lattice effect by anion radicals Reviewed
T Sato, T Hasegawa, T Akutagawa, T Nakamura, R Kondo
PHYSICAL REVIEW B 69 ( 7 ) 2004.2
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2kF transitions in a series of (DMET)2(X 1X2TCNQ) (X1, X2=Br, Cl, F, CH 3, H): Subsidiary lattice effect by anion radicals
T. Sato, T. Hasegawa, T. Akutagawa, T. Nakamura, R. Kondo
Physical Review B - Condensed Matter and Materials Physics 69 ( 7 ) 751031 - 751035 2004.2
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Crystal structure and electronic band structure of the organic superconductor alpha-(BEDT-TTF)(2)NH4Hg(SCN)(4) under uniaxial strain Reviewed
R Kondo, S Kagoshima, M Maesato
PHYSICAL REVIEW B 67 ( 13 ) 2003.4
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Crystal structure and electronic band structure of the organic superconductor α-(BEDT-TTF)2NH4HG(SCN)4 under uniaxial strain Reviewed
Ryusuke Kondo, Seiichi Kagoshima, Mitsuhiko Maesato
Physical Review B - Condensed Matter and Materials Physics 67 ( 13 ) 1345191 - 1345196 2003.4
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Band structure control of organic superconductors by the uniaxial strain method Reviewed
S. Kagoshima, R. Kondo, M. Maesato
Synthetic Metals 137 ( 1-3 ) 1163 - 1165 2003
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Uniaxial strain study of electronic and crystal structures of organic conductors Reviewed
S. Kagoshima, R. Kondo, M. Chusho, M. Maesato, T. Mori, H. Mori, S. Tanaka
Synthetic Metals 133-134 145 - 146 2003
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Crystal and band structures of organic superconductor under the uniaxial strain Reviewed
R. Kondo, S. Kagoshima, M. Maesato
Physica C: Superconductivity and its Applications 388-389 601 - 602 2003
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Crystal structure of organic superconductor, α-(BEDT-TTF)2NH4Hg(SCN)4, under the uniaxial strain Reviewed
R. Kondo, S. Kagoshima, M. Maesato
Synthetic Metals 133-134 137 - 139 2003
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Metal-insulator transition of donor-acceptor-type organic charge-transfer complex (BETS)2(Br2TCNQ): Site-selective NMR measurements Reviewed
K. Hiraki, S. Furuta, T. Takahashi, R. Kondo, S. Kagoshima, T. Hasegawa, T. Mochida, Y. Iwasa
Physical Review B - Condensed Matter and Materials Physics 66 ( 3 ) 351041 - 351046 2002.7
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Metal-insulator transition of donor-acceptor-type organic charge-transfer complex (BETS)(2)(Br(2)TCNQ): Site-selective NMR measurements Reviewed
K Hiraki, S Furuta, T Takahashi, R Kondo, S Kagoshima, T Hasegawa, T Mochida, Y Iwasa
PHYSICAL REVIEW B 66 ( 3 ) 035104-1-035104-6 2002.7
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Control of electronic properties of organic superconductors by uniaxial strain method Reviewed
S. Kagoshima, R. Kondo, T. Shibata, H. Hirai, M. Maesato, H. Hoshino, T. Mori, H. Mori, S. Tanaka
Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals 380 77 - 84 2002
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Effects of uniaxial strain on α-(BEDT-TTF)2MHg(SCN) 4 [M=K, NH4] Reviewed
M. Maesato, S. Kagoshima, R. Kondo, T. Shibata, H. Hirai
Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals 376 195 - 200 2002
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Superconductivity and metal-insulator transition in twin-columnar organic superconductor, (BETS)(2)(X(2)TCNQ) [X=Cl, Br] Reviewed
R Kondo, T Hasegawa, T Mochida, S Kagoshima, Y Iwasa, K Hiraki, T Takahashi
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 70 ( 10 ) 3023 - 3030 2001.10
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Control of electronic properties of alpha-(BEDT-TTF)(2)MHg(SCN)(4) (M=K,NH4) by the uniaxial strain method Reviewed
M Maesato, Y Kaga, R Kondo, S Kagoshima
PHYSICAL REVIEW B 64 ( 15 ) 2001.10
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Neutral-ionic phase transition of (BEDT-TTF)(ClMeTCNQ) under pressure Reviewed
T Hasegawa, T Akutagawa, T Nakamura, T Mochida, R Kondo, S Kagoshima, Y Iwasa
PHYSICAL REVIEW B 64 ( 8 ) 2001.8
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Electronic properties of novel donor-acceptor type charge transfer complexes, (BETS)(2)(X(2)TCNQ) (X = Cl, Br): H-1, Se-77 and C-13-NMR Reviewed
K Hiraki, T Takahashi, R Kondo, S Kagoshima, T Hasegawa, T Mochida, Y Iwasa
SYNTHETIC METALS 120 ( 1-3 ) 917 - 918 2001.3
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Metal-insulator transition in donor-acceptor type superconductor, (BETS)(2)(X(2)TCNQ) Reviewed
R Kondo, T Hasegawa, S Kagoshima, T Mochida, Y Iwasa
SYNTHETIC METALS 120 ( 1-3 ) 995 - 996 2001.3
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Electronic states of novel donor/acceptor type of organic superconductor, (BETS)(2)(Cl(2)TCNQ) Reviewed
K Hiraki, T Takahashi, R Kondo, S Kagoshima, T Hasegawa, T Mochida, Y Iwasa
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 62 ( 1-2 ) 401 - 403 2001.1
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Novel electronic states of organic conductors under uniaxial stress or uniaxial strain Reviewed
S. Kagoshima, M. Maesato, Y. Kaga, R. Kondo
Synthetic Metals 117 ( 1-3 ) 87 - 90 2001
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Donor-acceptor-type complexes of (BEDT-TTF)(TCNQ) analogues: Peculiar magnetic transition in (BEDO-TTF)(Cl2TCNQ) Reviewed
T. Hasegawa, R Kondo, S. Kagoshima, Y. Iwasa, T. Mochida, T. Akutagawa, T. Nakamura
Synthetic Metals 120 991 - 992 2001
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Control of electronic properties of (formula presented) (formula presented) by the uniaxial strain method Reviewed
M. Maesato, Y. Kaga, R. Kondo, S. Kagoshima
Physical Review B - Condensed Matter and Materials Physics 64 ( 15 ) 2001
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M. Maesato, Y. Kaga, R. Kondo, S. Kagoshima
Physical Review B - Condensed Matter and Materials Physics 64 ( 15 ) 1551041 - 1551048 2001
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Artificial control of intermolecular distance of organic superconductors: α -type BEDT-TTF compounds Reviewed
S. Kagoshima, T. Shibata, H. Hirai, R. Kondo, M. Maesato
Current Applied Physics 1 ( 1 ) 72 - 76 2001
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Electronic and crystal structures of organic superconductors under the uniaxial strain Reviewed
S. Kagoshima, R. Kondo, M. Maesato
Current Applied Physics 1 ( 4-5 ) 307 - 311 2001
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Uniaxial strain study of organic conductors (TMTSF)2PF6 Reviewed
H. Hirai, R. Kondo, M. Maesato, T. Shibata, S. Kagoshima
Synthetic Metals 120 ( 1-3 ) 963 - 964 2001
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Uniaxial strain study of organic conductors α-(BEDT-TTF)2MHg(SCN)4 [M=K, NH4] Reviewed
M. Maesato, Y. Kaga, R. Kondo, H. Hirai, S. Kagoshima
Synthetic Metals 120 ( 1-3 ) 941 - 942 2001
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Control of electronic properties of organic conductors by uniaxial strain method Reviewed
S. Kagoshima, M. Maesato, R. Kondo, T. Shibata, H. Hirai
Synthetic Metals 120 ( 1-3 ) 683 - 686 2001
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Control of electronic properties of organic conductors by hydrostatic and uniaxial compression Reviewed
S. Kagoshima, R. Kondo, H. Hirai, T. Shibata, Y. Kaga, M. Maesato
Physica Status Solidi (B) Basic Research 223 ( 1 ) 97 - 104 2001
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Electronic states in the spin-density wave phase of organic conductors: Roles of the coexisting 2kF and 4kF charge-density waves Reviewed
S. Kagoshima, Y. Saso, M. Maesato, R. Kondo, T. Yamaguchi, V.A. Bondarenko, T. Hasegawa
Synthetic Metals 117 ( 1-3 ) 39 - 43 2001
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Mixed-stack organic charge-transfer complexes with intercolumnar networks Reviewed
T Hasegawa, T Mochida, R Kondo, S Kagoshima, Y Iwasa, T Akutagawa, T Nakamura, G Saito
PHYSICAL REVIEW B 62 ( 15 ) 10059 - 10066 2000.10
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Uniaxial strain method for soft crystals: Application to the control of the electronic properties of organic conductors
M Maesato, Y Kaga, R Kondo, S Kagoshima
REVIEW OF SCIENTIFIC INSTRUMENTS 71 ( 1 ) 176 - 181 2000.1
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Mixed-stack organic charge-transfer complexes with intercolumnar networks Reviewed
HASEGAWA T, MOCHIDA T, KONDO R, KAGOSHIMA S, IWASA Y, AKUTAGAWA T, NAKAMURA T, SAITO G
Physical Review B 62 ( 15 ) 10059 - 10066 2000
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Semiclassical and non-classical angular effects of magnetoresistance in (TMTSF)2X Reviewed
Toshihito Osada, Toshihito Osada, Nobuharu Kami, Nobuharu Kami, Ryusuke Kondo, Seiichi Kagoshima
Synthetic Metals 103 2024 - 2027 1999.6
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Organic metals involving double chain donor arrangements, (BMDT-TTF)(2)((RR2)-R-1-TCNQ) [R-1 = H, Me, R-2 = Cl, Br] Reviewed
T Mochida, T Hasegawa, R Kondo, S Kagoshima, Y Iwasa
SYNTHETIC METALS 102 ( 1-3 ) 1680 - 1680 1999.6
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Electronic phase transition of BEDT-TTF based mixed-stack charge-transfer complexes Reviewed
T Hasegawa, T Akutagawa, T Nakamura, Y Sasou, R Kondo, S Kagoshima, T Mochida, G Saito, Y Iwasa
SYNTHETIC METALS 103 ( 1-3 ) 1804 - 1805 1999.6
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Structure and properties of (BEDSe-TTF)(Fn-TCNQ) charge transfer complexes (n=1, 2, 4) Reviewed
T Mochida, H Moriyama, T Hasegawa, R Kondo, S Kagoshima, Y Iwasa
SYNTHETIC METALS 102 ( 1-3 ) 1678 - 1679 1999.6
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Structure and properties of ail organic conductor (BEDT-TseF)(2)(X(1)X(2)TCNQ) (X-1,X-2=Cl,Br) Reviewed
R Kondo, S Kagoshima, T Hasegawa, T Mochida, Y Iwasa
SYNTHETIC METALS 102 ( 1-3 ) 1628 - 1629 1999.6
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Donor-acceptor type superconductor, (BETS)(2)(Cl(2)TCNQ) Reviewed
R Kondo, T Hasegawa, T Mochida, S Kagoshima, Y Iwasa
CHEMISTRY LETTERS 1999 ( 4 ) 333 - 334 1999.4
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Low-temperature diffuse X-ray studies of charge-density waves coexisting with spin-density waves in the organic conductors (TMTSF)2PF6 and (TMTSF)2AsF6 Reviewed
S. Kagoshima, Y. Saso, M. Maesato, R. Kondo, T. Hasegawa
Solid State Communications 110 ( 9 ) 479 - 483 1999
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Electrical properties of Zn-Mg-RE (RE=Y, Gd) icosahedral quasicrystals Reviewed
R Kondo, T Hashimoto, K Edagawa, S Takeuchi, T Takeuchi, U Mizutani
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 66 ( 4 ) 1097 - 1102 1997.4
MISC
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KONDO Ryusuke, KAGOSHIMA Seiichi
X-RAYS 46 ( 2 ) 145 - 151 2004.4
Presentations
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角度分解光電子分光によるノーダルライン半金属LaTe1+xBi1-xのバンド分散
齋藤竜聖, 片岡範行, 脇田高徳, 景山晴加, 近藤隆祐, 野上由夫, 田中清尚, 横谷尚睦
日本物理学会 春季大会
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Polymorphic transformation triggered by the rearrangement of alkyl-side chains in molecular bilayer-type organic semiconductors
Arai Shunto, Tanaka Mutsuo, Inoue Satoru, Kondo Ryusuke, Kumai Reiji, Hasegawa Tatsuo
JSAP Annual Meetings Extended Abstracts 2021.2.26 The Japan Society of Applied Physics
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Layered Crystallinity and Semiconductor Property of Asymmetrically Substituted BTBT Derivatives Having Phenylethynyl Groups
Inoue Satoru, Toshiki Higashino, Shunto Arai, Mutsuo Tanaka, Ryusuke Kondo, Ryoko Sagayama, Reiji Kumai, Tatsuo Hasegawa
JSAP Annual Meetings Extended Abstracts 2019.9.4 The Japan Society of Applied Physics
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アルカリ超酸化物NaO2の低温構造
宮島瑞樹, 福田崇人, Fahmi Astuti, 近藤隆祐, 野上由夫, 中野岳仁, 渡邊功雄, 神戸高志, 小谷柾史
日本物理学会 秋季大会（物性）
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トポロジカル半金属YPdxPt1-xBiの作成と電気物性
近藤隆祐, 石井宏樹, 野上由夫
日本物理学会 第73回年次大会
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低温強磁場X線カメラの開発と希土類化合物RNiC2系への適用
近藤隆祐, 阿井幸男, 野上由夫
日本物理学会 秋季大会
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希土類化合物RNiC2(R=La, Ce)のホール効果2
野村勝史, 近藤隆祐, 野上由夫
日本物理学会第70回年次大会
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7pBJ-4 Hall effect of rare-earth compounds RNiC_2(R=Sm,Nd)
Nomura K., Kondo R., Nogami Y.
Meeting abstracts of the Physical Society of Japan 2014.8.22 The Physical Society of Japan (JPS)
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27aCJ-7 Structural phase transition in RNiC_2(R=Y,Ho,Er)
Kondo Ryusuke, Maeda Hiroyuki, Nomura Katsufumi, Nogami Yoshio
Meeting abstracts of the Physical Society of Japan 2014.3.5 The Physical Society of Japan (JPS)
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微弱信号検出における実験室とKEK-PFとのコラボ:有機結晶における放射線損傷の克服
野上由夫, 近藤隆祐, 中尾朗子, 小林賢介, 熊井玲児, 山崎裕一, 中尾裕則
物構研サイエンスフェスタ要旨集 2014
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27pXN-5 Crystal structure of (TMTTF)_2Br at low temperture
Toda Atsuki, Kondo Ryusuke, Nogami Yoshio, Nakao Akiko, Kumai Reiji
Meeting abstracts of the Physical Society of Japan 2013.3.26 The Physical Society of Japan (JPS)
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26aXZE-10 Single crystal preparation and property of RNiC_2
Maeda H., Yamamoto N., Kondo R., Nogami Y.
Meeting abstracts of the Physical Society of Japan 2013.3.26 The Physical Society of Japan (JPS)
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(TMTTF)2Brの電荷不均一と(TMTSF)2PF6のSDW/CDW共存
戸田敦基, 近藤隆祐, 野上由夫, 中尾朗子, 熊井玲児
物構研サイエンスフェスタ要旨集 2013
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21aEA-2 Synthesis of the superconductor Cu_xBi_2Se_3 and trial to introduce other kind of atoms instead of Cu one
Kondo R., Yoshinaka T., Imai Y., Maeda A.
Meeting abstracts of the Physical Society of Japan 2012.8.24 The Physical Society of Japan (JPS)
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24pBK-2 Symmetry Change in κ-(BEDT-TTF)_2Cu_2(CN)_3 at LT.
Yamamoto N., Nogami Y., Kondo R., Terasaki I., Sasaki T., Maesato M., Hanasaki N., Nakao A.
Meeting abstracts of the Physical Society of Japan 2012.3.5 The Physical Society of Japan (JPS)
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26pBK-2 Modulation Wavevector for θ-(BEDT-TTF)2CsZn(SCN)4 under Uniaxial Strain
Nogami Y., Tanimoto Y., Kondo R., Hanasaki N.
Meeting abstracts of the Physical Society of Japan 2012.3.5 The Physical Society of Japan (JPS)
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27aBK-4 Precursory CDW fluctuation observed above SDW transition temperature for (TMTSF)_2PF_6
Toda A., Nogami Y., Yamamoto N., Kondo R., Hanasaki N.
Meeting abstracts of the Physical Society of Japan 2012.3.5 The Physical Society of Japan (JPS)
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27aYC-10 Charge Density Wave and Magneto Resistance for DyNiC_2 and CeNiC_2
Maeda H., Yamamoto N., Nogami Y., Kondo R., Hanasaki N., Shimomura S.
Meeting abstracts of the Physical Society of Japan 2012.3.5 The Physical Society of Japan (JPS)
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β“-(DODHT)2AsF6の電荷秩序絶縁体転移
新崎洋一, 西川浩之, 近藤隆祐, 中尾朗子, 熊井玲児, 野上由夫
分子科学討論会講演プログラム&要旨(Web) 2012
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Pd-Bi-Se単結晶の超伝導特性
今井良宗, 鍋島冬樹, 吉中泰輝, 宮谷昂佑, 近藤隆祐, 小宮世紀, 塚田一郎, 前田京剛
応用物理学会学術講演会講演予稿集(CD-ROM) 2012
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Pd-Bi-Se単結晶の超伝導特性
今井良宗, 鍋島冬樹, 吉中泰輝, 宮谷昂佑, 近藤隆祐, 小宮世紀, 塚田一郎, 前田京剛
日本物理学会講演概要集 2012
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24aTC-3 Magneto-transport property of Compensated Topological Insulator Bi_2Se_3
Yoshinaka T., Kondo R., Imai Y., Maeda A.
Meeting abstracts of the Physical Society of Japan 2011.8.24 The Physical Society of Japan (JPS)
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Solid state physics 2011.5
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26pTB-2 Observation of Charge Density wave and Charge Ordering in (TMTCF)_2X by X-ray and SR 1.
Nogami Y., Toda A., Kondo R., Hanasaki N., Kambe T., Nakao A.
Meeting abstracts of the Physical Society of Japan 2011.3.3 The Physical Society of Japan (JPS)
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25aTA-4 Structural study of θ-(BEDT-TTP)_2CsZn(SCN)_4 under uniaxial strain
Kondo R, Kagoshima S, Kumai R, Nakao A, Tanimoto Y, Nogami Y, Sawa H
Meeting abstracts of the Physical Society of Japan 2011.3.3 The Physical Society of Japan (JPS)
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26aHG-13 Magneto-transport property of Compensated Topological Insulator Bi_2Se_3
Yoshinaka T., Kondo R., Imai Y., Maeda A.
Meeting abstracts of the Physical Society of Japan 2011.3.3 The Physical Society of Japan (JPS)
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26aHG-14 Electrical transport property in substituted or intercalated Toporogical Insulator Bi_2Se_3
Kondo R., Yoshinaka T., Imai Y., Maeda A.
Meeting abstracts of the Physical Society of Japan 2011.3.3 The Physical Society of Japan (JPS)
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一軸柱圧縮下θ‐(BEDT‐TTF)2CsZn(SCN)4の構造変調
近藤隆祐, 鹿児島誠一, 熊井玲児, 中尾朗子, 谷本由衣, 野上由夫, 澤博
日本物理学会講演概要集 2011.3.3
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(TMTCF)2XのCDW/COのX線放射光観察 1
野上由夫, 戸田敦基, 近藤隆祐, 花咲徳亮, 神戸高志, 中尾朗子
日本物理学会講演概要集 2011
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スピンパイエルス物質における静水圧力・一軸性圧縮効果と自在な物性制御 Invited
美藤正樹, 出口博之, 藤田 渉, 近藤隆祐, 鹿児島誠一
固体物理 2010.7
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23aPS-48 Quasi-particle injection effects induced by intense terahertz pulse in the SDW phase of (TMTSF)_2PF_6
Tsubota S., Watanabe S., Kondo R., Kagoshima S., Shimano R.
Meeting abstracts of the Physical Society of Japan 2010.3.1 The Physical Society of Japan (JPS)
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21pGT-11 ^<13>C-NMR study on α-(BEDT-TTF)_2CsCd(SCN)_4
Takahashi R., Hiraki K., Takahashi T., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2010.3.1 The Physical Society of Japan (JPS)
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20aGT-10 The AC conductivity of θ-type organic conductors under uniaxial strain
KONDO Ryusuke, Kaogshima S.
Meeting abstracts of the Physical Society of Japan 2010.3.1 The Physical Society of Japan (JPS)
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23pRB-12 Charge ordering and superconductivity in β"-(DODHT)_2PF_6
Kondo Ryusuke, Kagoshima S, Yamamoto K, Yakushi K, Nishikawa H
Meeting Abstracts of the Physical Society of Japan 2010 The Physical Society of Japan
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25aYC-8 ^<13>C-NMR study on α-(BEDT-TTF)_2CsCd(SCN)_4
Takahashi R., Hiraki K., Takahashi T., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2009.8.18 The Physical Society of Japan (JPS)
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25aXA-9 Ultrafast photo-induced closing and recovery of spin-density-wave gap in (TMTSF)_2PF_6
Watanabe S., Kondo R., Kagoshima S., Shimano R.
Meeting abstracts of the Physical Society of Japan 2009.8.18 The Physical Society of Japan (JPS)
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25aXA-10 Conductivity change induced by intense terahertz pulse excitation in the SDW phase of (TMTSF)_2PF_6
Tsubota S., Watanabe S., Kondo R., Kagoshima S., Shimano R.
Meeting abstracts of the Physical Society of Japan 2009.8.18 The Physical Society of Japan (JPS)
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25aYC-10 Electronic Properties of β"-(DODHT)_2PF_6 in the Charge Fluctuating Phase (II)
Kondo Ryusuke, Higa M., Murata A., Kagoshima S., Nishikawa H.
Meeting abstracts of the Physical Society of Japan 2009.8.18 The Physical Society of Japan (JPS)
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29pYF-5 Electrical and Structure properties of α-(BEDT-TTF)_2CsCd(SCN)_4
KONDO Ryusuke, Higa Momoka, Kagoshima Seiichi, Nakao Akiko, Sawa Hiroshi
Meeting abstracts of the Physical Society of Japan 2009.3.3 The Physical Society of Japan (JPS)
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28pVD-2 Dynamics of photo-induced melting of spin-density-wave states in (TMTSF)_2PF_6
Watanabe S., Kondo R., Kagoshima S., Shimano R.
Meeting abstracts of the Physical Society of Japan 2009.3.3 The Physical Society of Japan (JPS)
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30aYF-4 Electronic Property of β"-(DODHT)_2PF_6 in the Charge Fluctuating Phase
Higa M., Murata A., Kondo R., Kagoshima S., Nishikawa H.
Meeting abstracts of the Physical Society of Japan 2009.3.3 The Physical Society of Japan (JPS)
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α-(BEDT-TTF)2CsCd(SCN)4の構造物性
近藤隆祐, 比嘉百夏, 鹿児島誠一, 中尾朗子, 澤博
日本物理学会講演概要集 2009
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22pTC-4 AC conductivity measurement of β"-(DODHT)_2X
Higa M., Murata A., Kondo R., Kagoshima S., Nishikawa H.
Meeting abstracts of the Physical Society of Japan 2008.8.25 The Physical Society of Japan (JPS)
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22pTC-3 The electronic structure of β"-(BEDT-TTF)_2AuBr_2 under uniaxial strain
Kondo Ryusuke, Higa Momoka, Kagoshima Seiichi
Meeting abstracts of the Physical Society of Japan 2008.8.25 The Physical Society of Japan (JPS)
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22aTC-8 Crystal Structure analyses of α-(BEDT-TTF)_2I_3 and α-(BEDT-TSeF)_2I_3 under pressure
KONDO Ryusuke, Kagoshima Seiichi, Tajima Naoya, Kato Reizo
Meeting abstracts of the Physical Society of Japan 2008.8.25 The Physical Society of Japan (JPS)
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26aWB-5 Satellite reflection measurement of β"-(BEDT-TTF)_2AuBr_2
Kakinuma M., Hanasaki N., Nogami Y., Kondo R., Kagoshina S.
Meeting abstracts of the Physical Society of Japan 2008.2.29 The Physical Society of Japan (JPS)
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24aYH-5 Observation of the spin density wave gap in (TMTSF)_2PF_6 by terahertz time domain spectroscopy
Watanabe S., Shimano R., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2008.2.29 The Physical Society of Japan (JPS)
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26aWB-4 Electrical properties of b"-(BEDT-TTF)_2AuBr_2
Kondo R., Kagoshima S., Kakinuma M., Hanasaki N., Nogami Y.
Meeting abstracts of the Physical Society of Japan 2008.2.29 The Physical Society of Japan (JPS)
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α-(BEDT-TTF)_2I_3の静水圧力下構造解析(京都大学基礎物理学研究所共同利用研究会「分子性ゼロギャップ物質の新物性」,研究会報告)
近藤 隆祐, 比嘉 百夏, 鹿児島 誠一
物性研究 2008 物性研究刊行会
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β′′-DODHT塩の電荷秩序絶縁相
西川浩之, 大塩寛紀, 比嘉百夏, 近藤隆祐, 鹿児島誠一, 中尾朗子, 澤博
分子科学討論会講演プログラム&要旨(Web) 2008
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21aRA-3 Anisotropic superconductivity in β"-(DODHT)2_PF_6
Higa M., Kondo R., Kagoshima S., Nishikawa H.
Meeting abstracts of the Physical Society of Japan 2007.8.21 The Physical Society of Japan (JPS)
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22aTK-6 Terahertz time domain reflection spectroscopy measurement of (TMTSF)_2PF_6
Watanabe S., Shimano R., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2007.8.21 The Physical Society of Japan (JPS)
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21pRA-3 Development of the uniaxial strain method and its application to 2D organic conductors
Kondo Ryusuke
Meeting abstracts of the Physical Society of Japan 2007.8.21 The Physical Society of Japan (JPS)
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21pRA-6 Non-linior transport of β" and θ type salts under pressure
Higa M., Kondo R., Kagoshima S., Nishikawa H.
Meeting abstracts of the Physical Society of Japan 2007.2.28 The Physical Society of Japan (JPS)
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19pRJ-16 Fabrication of a Superconductor Junction Composed of Organic Superconductors
Kowada H., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2007.2.28 The Physical Society of Japan (JPS)
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21aRA-5 STM/STS on θ and α-(BEDT-TTF)_2X
Ikeda S., Ichimura K., Nomura K., Ishioka J., Tanda S., Kondo R., Higa M., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2007.2.28 The Physical Society of Japan (JPS)
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圧力誘起超伝導体DODHT塩における構造と物性の対アニオン依存性
西川浩之, 大塩寛紀, 比嘉百夏, 近藤隆祐, 鹿児島誠一, 安塚周磨, ARUMUGAM Sonachalam, 村田恵三, 中尾朗子, 澤博
分子科学討論会講演要旨集(CD-ROM) 2007
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26aYB-6 Preparing the superconductor-superconductor junction composed of two organic superconductor κ-(BEDT-TTF)_2Cu(NCS)_2 crystals
Kowada H., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2006.8.18 The Physical Society of Japan (JPS)
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25pYF-5 Nonlinear conduction under uni-axial strain of α-(BEDT-TTF)_2CsCd(SCN)_4
Higa M., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2006.8.18 The Physical Society of Japan (JPS)
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25pYF-16 Crystal structure of β"-(DODHT)_2AsF_6 at low temperature
Higa M., Kondo R., Kagoshima S., Nishikawa H.
Meeting abstracts of the Physical Society of Japan 2006.8.18 The Physical Society of Japan (JPS)
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25pYF-17 Charge Ordering and Pressure-Induced Superconductivity in β"-DODHT Salt
Kobayashi Akito, Suzumura Yoshikazu, Higa Momoka, Kondo Ryusuke, Kagoshima Seiichi, Nishikawa Hiroyuki
Meeting abstracts of the Physical Society of Japan 2006.8.18 The Physical Society of Japan (JPS)
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25aZB-9 Development of uniaxial extensile stress method II : an application to quasi-one-dimensional conductor NbSe_3
Kowada H., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2006.8.18 The Physical Society of Japan (JPS)
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23aYB-3 Magnetoresistance of B"-(BEDT-TTF)_2CsCd(SCN)_4 under in plane magnetic field
Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2006.8.18 The Physical Society of Japan (JPS)
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28aRB-4 Crystal structure analyses of α-(BEDT-TTF)_2CsCd(SCN)_4 under uniaxial strain
Kondo R., Higa M., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2006.3.4 The Physical Society of Japan (JPS)
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27aRB-2 Ultra high pressure application to organic conductors
Kagoshima Seiichi, Kondo Ryusuke, Matsushita Nobuyuki, Higa Momoka, Ovsyannikov Sergey V., Shaidarova Nadezhda A., Shchennikov Vladimir V.
Meeting abstracts of the Physical Society of Japan 2006.3.4 The Physical Society of Japan (JPS)
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30pRB-3 Crystal structure of β"-(DODHT)_2PF_6 under hydrostatic pressure
Higa M., Kondo R., Kagoshima S., Nishikawa H.
Meeting abstracts of the Physical Society of Japan 2006.3.4 The Physical Society of Japan (JPS)
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27aRB-1 Development of uniaxial tensile stress method
Kowada H., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2006.3.4 The Physical Society of Japan (JPS)
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21pWB-10 ^<77>Se NMR measurements under pressure on(BETS)_2(Cl_2TCNQ)
Takano Y., Hiraki K., Takahashi T., Kondo R., Kagoshima S., Hasegawa T., Mochida T., Iwasa Y.
Meeting abstracts of the Physical Society of Japan 2005.8.19 The Physical Society of Japan (JPS)
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19pWB-2 Low Temperature Fermi Surface of β"-(BEDT-TTF)_2CsCd(SCN)_4
Kimata M., Ohta H., Koyama K., Motokawa M., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2005.8.19 The Physical Society of Japan (JPS)
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26pYL-8 Electronic property of α-(BEDT-TTF)_2CsCd(SCN)_4 under uniaxial strain
Higa M., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2005.3.4 The Physical Society of Japan (JPS)
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27pYL-7 Phase transition on (BEDO-TTF)(Cl_2TCNQ) : Spin dynamics observed by NMR measurements iv
Takahashi M., Hiraki K., Takahashi T., Kondo R., Kagoshima S., Hasegawa T.
Meeting abstracts of the Physical Society of Japan 2005.3.4 The Physical Society of Japan (JPS)
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26pYL-9 Low-Temperature electronic properties of β"-(BEDT-TTF)_2CsCd(SCN)_4
Otsuji J, Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2005.3.4 The Physical Society of Japan (JPS)
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27aYL-11Charge ordering in pressure-induced superconductor, β"-(DODHT)_2PF_6
Nishikawa H., Sato Y., Kikuchi K., Kodama T., Ikemoto I., Yamada J., Oshio H., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2005.3.4 The Physical Society of Japan (JPS)
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Control of electronic properties of molecular conductors by uniaxial strain
S Kagoshima, R Kondo
CHEMICAL REVIEWS 2004.11
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13aWH-7 Phase transition on (BEDO-TTF) (Cl_2TCNQ) : Spin dynamics observed by NMR measurements III
Takahashi M., Hiraki K., Takahashi T., Kondo R., Kagoshima S., Hasegawa T.
Meeting abstracts of the Physical Society of Japan 2004.8.25 The Physical Society of Japan (JPS)
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13aWH-6 Full structure analyses of molecular single crystal at low-temperatures under high-pressures below 1.5GPa III
Takahashi Y., Kumai R., Hasegawa T., Horiuchi S., Tokura Y., Kondo R., Kagoshima S., Sawa H.
Meeting abstracts of the Physical Society of Japan 2004.8.25 The Physical Society of Japan (JPS)
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13pWE-6 The effect of uniaxial strain on β"-(BEDT-TTF)_2SF_5CH_2CF_2SO_3
Maesato M., Saito G., Schlueter J. A., Mohtasham J., Gard G. L., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2004.8.25 The Physical Society of Japan (JPS)
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KUMAI REIJI, HORIUCHI SACHIO, TAKAHASHI YUKIHIRO, HASEGAWA TATSUO, TOKURA YOSHINORI, KONDO RYUSUKE, KAGOSHIMA SEIICHI, SAWA HIROSHI
日本化学会講演予稿集 2004.3.11
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28pWG-6 Full structure analysis of molecular single crystal under low-temperatures and under high-pressures below 1.5GPa
Kumai Reiji, Takahashi Yukihiro, Hasegawa Tatsuo, Horiuchi Sachio, Tokura Yoshinori, Kondo Ryusuke, Kagoshima Seiichi, Sawa Hiroshi
Meeting abstracts of the Physical Society of Japan 2004.3.3 The Physical Society of Japan (JPS)
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28pWG-11 Phase transition on (BEDO-TTF)(Cl_2TCNQ) : Spin dynamics observed by NMR measurements
Takahashi M., Hiraki K., Takahashi T., Kondo R., Kagoshima S., Hasegawa T.
Meeting abstracts of the Physical Society of Japan 2004.3.3 The Physical Society of Japan (JPS)
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27pWL-1 Crystal Structure and electronic properties of α-(BEDT-TTF)_2CsCd(SCN)_4
Kondo R., Higa M., Otsuji J., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2004.3.3 The Physical Society of Japan (JPS)
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Phase transition on (BEDO-TTF)(Cl_2TCNQ) : Spin dynamics observed by NMR measurements
Hiraki K., Takahashi T., Hasegawa T., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2003.3.6 The Physical Society of Japan (JPS)
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Crystal Structure Analysis under the Uniaxial Stress : α-(BEDT-TTF)_2I_3
Kondo R, Kagoshima S
Meeting abstracts of the Physical Society of Japan 2003.3.6 The Physical Society of Japan (JPS)
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Takeuchi Tomoaki, Hoshino Hirotada, Kondo Ryusuke, Kagoshima Seiichi, Enomoto Masaya, Kawamoto Tadashi, Mori Takehiko
J Phys Soc Jpn 2003 The Physical Society of Japan (JPS)
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Metal-insulator transition of donor-acceptor-type organic charge-transfer complex (BETS)(2)(Br(2)TCNQ): Site-selective NMR measurements
K Hiraki, S Furuta, T Takahashi, R Kondo, S Kagoshima, T Hasegawa, T Mochida, Y Iwasa
PHYSICAL REVIEW B 2002.7
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24aXM-4 Crystal Structure Analysis under the Uniaxial Stress: a -(ET)_2NH_4Hg(SCN)_4
Kondo R., Kagoshinsa S., Maesato M.
Meeting abstracts of the Physical Society of Japan 2002.3.1 The Physical Society of Japan (JPS)
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25pXM-2 NMR study on (BETS)_2(X_2TCNQ) (X=Br,Cl) V
Furuta S., Hiraki K., Takahashi T., Kondo R., Kagoshima S., Hasegawa T., Mochida T., Iwasa Y.
Meeting abstracts of the Physical Society of Japan 2002.3.1 The Physical Society of Japan (JPS)
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Structural Control of Organic Conductors by Uniaxial Strain: θ- and α-Phases of BEDT-TTF Compounds
R. Kondo, S. Kagoshima, M. Chusho, H. Hoshino, T. Mori, H. Mori, S. Tanaka
Current Appl. Phys. 2002
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NMR study on (BETS)_2(X_2TCNQ)(X=Br, Cl)IV
Furuta S., Hiraki K., Takahashi T., Kondo R., Kagoshima S., Hasegawa T., Mochida T., Iwasa Y.
Meeting abstracts of the Physical Society of Japan 2001.9.3 The Physical Society of Japan (JPS)
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Photo-induced effect in the CDW phase of K_<0.3>MoO_3
Ogawa N., Kondo R., Murakami Y., Miyano K.
Meeting abstracts of the Physical Society of Japan 2001.9.3 The Physical Society of Japan (JPS)
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Neutral-ionic phase transition of (BEDT-TTF)(ClMeTCNQ) under pressure
T. Hasegawa, T. Akutagawa, T. Nakamura, T. Mochida, R. Kondo, S. Kagoshima, Y. Iwasa
Physical Review B - Condensed Matter and Materials Physics 2001.8.15
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NMR study of (BETS)_2(X_2TCNQ) III
Hiraki K., Takahashi T., Kondo R., Kagoshima S., Hasegawa T., Mochida T., Iwasa Y.
Meeting abstracts of the Physical Society of Japan 2001.3.9 The Physical Society of Japan (JPS)
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Liquid-Vapor-Like Spin-Lattice Phase Transition in (BEDO-TTF)(Cl_2TCNQ)
Hasegawa T., Akutagawa T., Nakamura T., Naito T., Inabe T., Mochida T., Kondo R., Kagoshima S., Iwasa Y., Saito G.
Meeting abstracts of the Physical Society of Japan 2001.3.9 The Physical Society of Japan (JPS)
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Effects of the chemical and physical pressures on organic superconductors
Kondo Ryusuke
Meeting abstracts of the Physical Society of Japan 2001.3.9 The Physical Society of Japan (JPS)
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Crystal Structure Analysis under the Uniaxial Compression : α-(ET)_2NH_4Hg(SCN)_4
Hirai H., Suma K., Kondo R., Kagoshima S., Mitsuhiko M.
Meeting abstracts of the Physical Society of Japan 2001.3.9 The Physical Society of Japan (JPS)
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Control of Electronic Properties of α-(BEDT・TTF)_2KHg(SeCN)_4 by Uniaxial Strain
Shibata T., Kondo R., Kagoshima S., Maesato M.
Meeting abstracts of the Physical Society of Japan 2001.3.9 The Physical Society of Japan (JPS)
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Electronic Properties under Uni-axial Compression : θ-(BO)_2Cl(H_2O)_x
Kondo R., Chyusyo M., Kagoshima S., Hoshino H., Mori T.
Meeting abstracts of the Physical Society of Japan 2001.3.9 The Physical Society of Japan (JPS)
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Electronic properties of novel donor-acceptor type charge transfer complexes, (BETS)(2)(X(2)TCNQ) (X = Cl, Br): H-1, Se-77 and C-13-NMR
K Hiraki, T Takahashi, R Kondo, S Kagoshima, T Hasegawa, T Mochida, Y Iwasa
SYNTHETIC METALS 2001.3
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Metal-insulator transition in donor-acceptor type superconductor, (BETS)(2)(X(2)TCNQ)
R Kondo, T Hasegawa, S Kagoshima, T Mochida, Y Iwasa
SYNTHETIC METALS 2001.3
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Electro Paramagnetic Resonance of (BEDT-TTF)(ClMeTCNQ) under high pressure
Hasegawa T., Akutagawa T., Nakamura T., Kondo R., Iwasa Y., Sienkiewicz A., Forro L.
Meeting abstracts of the Physical Society of Japan 2000.9.10 The Physical Society of Japan (JPS)
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Electric Properties by Uniaxial Compression of θ-ET_2CsZn(SCN)_4
Hoshino H., Kondo R., Kagoshima S., Mori T., Mori H., Tanaka S.
Meeting abstracts of the Physical Society of Japan 2000.9.10 The Physical Society of Japan (JPS)
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Photo-induced effect in charge-density-wave conductor K_<0.3>MoO_3
Ogawa N., Shiraga A., Kondo R., Kagoshima S., Satoh T., Miyano K.
Meeting abstracts of the Physical Society of Japan 2000.9.10 The Physical Society of Japan (JPS)
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ドナー・アクセプター型有機超伝導体 (BETS)2(Cl2TCNQ) Invited
近藤隆祐, 鹿児島誠一, 長谷川達生
固体物理 2000.5 アグネ技術センタ-
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Control of Electronic Properties by Uniaxial Compression : Anomalous metallic phase and Superconductivity of α-(BEDT-TTF)_2MHg(SCN)_4[M=K,NH_4] III
Maesato M., Kaga Y., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2000.3.10 The Physical Society of Japan (JPS)
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The Electronic Properties of (TMTSF)_2PF_6 under the Uniaxial Compression
Shibata T., Maesato M., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 2000.3.10 The Physical Society of Japan (JPS)
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NMR study on (BETS)_2(X_2TCNQ)(X=Cl,Br) II
Hiraki K., Takahashi T., Kondo R., Kagoshima S., Hasegawa T., Mochida T., Iwasa Y.
Meeting abstracts of the Physical Society of Japan 2000.3.10 The Physical Society of Japan (JPS)
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Mixed-stack organic charge-transfer complexes with intercolumnar networks
HASEGAWA T, MOCHIDA T, KONDO R, KAGOSHIMA S, IWASA Y, AKUTAGAWA T, NAKAMURA T, SAITO G
Physical Review B 2000
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Uniaxial Strain Method for the Control of Materials Properties
KAGOSHIMA Seiichi, MAESATO Mitsuhiko, KAGA Yasuyuki, KONDO Ryusuke
1999.12.5 The Physical Society of Japan (JPS)
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25ae / 25aE-5 Control of Electronic Properties by Uniaxial Compression II :(Anomalous metallic phase and Supercobdyctivity of α-(BEDT-TTF)_2Mg(SCN)_4 [M=K, NH_4] II)
Maesato M, Kaga Y, Kondo R, Kagoshima S
Meeting abstracts of the Physical Society of Japan 1999.9.3 The Physical Society of Japan (JPS)
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25pE-12 Anomaly of Dielectric Constant in (BEDT-TTF)(ClMeTCNQ) at Neutral-Ionic Phase Transtion under high pressure
Hasegawa T, Akutagawa T, Nakamura T, Kondo R, Kagoshima S, Mochida T, Iwasa Y
Meeting abstracts of the Physical Society of Japan 1999.9.3 The Physical Society of Japan (JPS)
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25pE-13 ^1H-NMR Study of (BETS)_2(X_2TCNQ)(X=Cl, Br)
Hiraki K, Takahashi T, Kondo R, Kagoshima S, Hasegawa T, Mochida T, Iwasa Y
Meeting abstracts of the Physical Society of Japan 1999.9.3 The Physical Society of Japan (JPS)
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25aE-3 Contorol of Electronic Properties by Uniaxial Compression I : α-(BEDT=TTF)_2I_3
Kaga Y, Maesato M, Kondo R, Kagoshima S
Meeting abstracts of the Physical Society of Japan 1999.9.3 The Physical Society of Japan (JPS)
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Structure and properties of ail organic conductor (BEDT-TseF)(2)(X(1)X(2)TCNQ) (X-1,X-2=Cl,Br)
R Kondo, S Kagoshima, T Hasegawa, T Mochida, Y Iwasa
SYNTHETIC METALS 1999.6
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Structure and properties of (BEDSe-TTF)(Fn-TCNQ) charge transfer complexes (n=1, 2, 4)
T Mochida, H Moriyama, T Hasegawa, R Kondo, S Kagoshima, Y Iwasa
SYNTHETIC METALS 1999.6
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31a-XB-11 Superconductivity and Metal-Insulator Transition of(BETS)_2X_2TCNQ(X=Br, Cl)
Kondo R., Kuroki Y., Kagoshima S., Hasegawa T., Mochida T., Iwasa Y.
Meeting abstracts of the Physical Society of Japan 1999.3.15 The Physical Society of Japan (JPS)
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31a-XB-8 Phase Diagram of(BEDT-TTF)(ClMeTCNQ)at high pressure
Hasegawa T., Akutagawa T., Nakamura T., Kondo R., Kagoshima S., Mochida T., Iwasa Y.
Meeting abstracts of the Physical Society of Japan 1999.3.15 The Physical Society of Japan (JPS)
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29p-XB-12 Control of Electronic Properties by Uniaxial Compression III : Anomalous metallic phase and Superconductivity of α-(BEDT-TTF)-_MHg(SCN)_4[M=K, NH-4]
Maesato M., Kaga Y., Kondo R., Kagoshima S.
Meeting abstracts of the Physical Society of Japan 1999.3.15 The Physical Society of Japan (JPS)
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28p-XB-1 X-ray studies of charge-density waves around 4K : ((TMTSF)_2X and α-(BEDT-TTF)_2KHg(SCN)_4
Saso Y., Kagoshima S., Maesato M., Kondo R.
Meeting abstracts of the Physical Society of Japan 1999.3.15 The Physical Society of Japan (JPS)
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29p-XB-10 Control of Electronic Properties by Uniaxial Compression : Purposes and Methods
Kagoshima S., Kaga Y., Maesato M., Kondo R.
Meeting abstracts of the Physical Society of Japan 1999.3.15 The Physical Society of Japan (JPS)
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Neutral-lonic Phase Transition in BEDT-TTF-based Mixed Stack Charge-Transfer Complexes
HASEGAWA T., AKUTAGAWA T., NAKAMURA T., KONDO R., KAGOSHIMA S., MOCHIDA T., IWASA Y.
Meeting abstracts of the Physical Society of Japan 1998.9.5 The Physical Society of Japan (JPS)
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Metal phase of BETS-X_1X_2TCNQ(X_1,X_2=Br,Cl)in low temperature range
KONDO R., KAGOSHIMA S., HASEGAWA T., MOCHIDA T., IWASA Y.
Meeting abstracts of the Physical Society of Japan 1998.9.5 The Physical Society of Japan (JPS)
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Develpoment and properties of BEDT-TseF based two-component charge-transfer Compounds
KONDO R., KAGOSHIMA S., HASEGAWA T., MOCHIDA T., IWASA Y.
Meeting abstracts of the Physical Society of Japan 1998.3.10 The Physical Society of Japan (JPS)
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Electronic Phase Transition in BEDT-TTF-based Mixed Stack Charge-Transfer Complexes
HASEGAWA T., SASOU Y., KONDO R., KAGOSHIMA S., MOCHIDA T., IWASA Y., SAITO G.
Meeting abstracts of the Physical Society of Japan 1998.3.10 The Physical Society of Japan (JPS)
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Electrical Conductivity of Mg-Zn-Rare Earth Icosahedral Quasicrystals
Kondo R., Hashimoto T., Edagawa K., Takeuchi S.
Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995.9.12 The Physical Society of Japan (JPS)
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The study of icosahedral quasicrystal AlCuFe by positron annihilation
Hamada E., Sato K., Kondo R., Nakata M., Kanazawa I., Takeuchi S.
Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995.9.12 The Physical Society of Japan (JPS)
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The study for vacancy-type defects in F・Ktype quasicrystal by positron annihilation
Sato K., Hamada E., Kondo R., Nakata M., Kanazawa I., Takeuchi S.
Abstracts of the meeting of the Physical Society of Japan. Sectional meeting 1995.9.12 The Physical Society of Japan (JPS)
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Electrical conductivity of Mg-Zn-Y icosahedral quasicrystal
Kondo R., Honda Y., Hashimoto T., Edagawa K., Takeuchi S.
Abstracts of the meeting of the Physical Society of Japan. Annual meeting 1995.3.16 The Physical Society of Japan (JPS)
Research Projects
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Quantum properties of true topological semimetal of single-crystal RTeSb with precise symmetric decision and carrier control.
Grant number：22K03528 2022.04 - 2025.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
野上 由夫, 近藤 隆祐
Grant amount：\4290000 （ Direct expense: \3300000 、 Indirect expense：\990000 ）
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Band-filling control of topological semimetals having a 2D square lattice structure
Grant number：21K03472 2021.04 - 2024.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
近藤 隆祐
Grant amount：\4160000 （ Direct expense: \3200000 、 Indirect expense：\960000 ）
本研究の目的は，ZrSiS構造をもつトポロジカル半金属物質群を対象として，バンド交差点に対してフェルミ準位を制御した試料を作製し測定することにより，当該物質のディラック電子の伝導特性を明らかにすることである．初年度は，主にランタノイド元素を含む LaTeSb 系及び LaTeBi 系の試料作成を行い，主に，Teが多いLaTeSb系で発現する電荷密度波（CDW）の波数より，当初の目論見の通り，連続的なバンドフィリング制御が出来ることを明らかにした．この結果を踏まえて，今年度は，①ランタノイド元素を非磁性のLaからCe, Pr, Ndといった磁性元素に拡張する，② 電荷密度波が報告されていないZrSiS系との比較を行うため，ZrSnTe系のバンドフィリング制御手法の確立を目指す，を行った．この系は，ランタノイドと化学的性質が似ているとされるイットリウム（Y）を含んだ YSbTe系のYとSbを周期律表において，それぞれ，右と左に一つ移動した系に相当しているため，特にこれを選択している．
①については，Ln=Ce, Pr, Ndを用いて，LnTe_1+xSb(Bi)_1-x:-0.2≦x≦0.2の試料を作成し，作成全域で単結晶を得ることが出来た．Ln=Laにおいては，xを変化させていくと，CDWを伴った正四角格子から正四角格子に歪が生じた2層構造に変化することを見出していたが，それよりも原子半径の小さいこれらの元素では，CDWを伴った正四角格子相と2層構造相の間に，CDWのない正四格子相が現れること，また，原子半径が小さくなるにつれて，その領域が広がることを見出した．
②については，仕込み組成を変化させるに従って，電気抵抗の振る舞いが連続的に変化する試料は得られたが，CDW等の構造的な観点からの変化は見い出せず，また，格子定数の変化もLnTeSb系に比べると非常に小さいことが分かった． -
Study of CDW in RNiC2
Grant number：26400362 2014.04 - 2017.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
Ryusuke Kondo, NOGAMI Yoshio
Grant amount：\4810000 （ Direct expense: \3700000 、 Indirect expense：\1110000 ）
Interplay between 4f-localized spins on Lanthanide atoms and Charge-density-waves on conducting bands is investigated in the rare earth intermetallic compound, RNiC2 system. The conduction bands are constructed of d-orbital of Lanthanide atoms and Nickel atoms and p-orbital of Carbon atoms. For this purpose, we have developed a Guinier-type x-ray monochromatic Laue Camera down to 3 K of the lowest temperature and up to 10 T of the highest magnetic field. Employing this camera, we have clarified relationships between the magnetic order of 4f-localized spin and the CDWs on the conduction bands in the field-induced structural phase transition of (Nd, Dy)NiC2.
In addition to that, origin of the commensurate phase of YNiC2 has been revealed performing a single crystalline structure analysis method. -
Correlation physical property, charge-density-wave and superconductivity in Rare-earth compound crystals which has no inversion symmetry.
Grant number：24540374 2012.04 - 2015.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
NOGAMI Yoshio, KONDO Ryusuke
Grant amount：\5070000 （ Direct expense: \3900000 、 Indirect expense：\1170000 ）
It was known that SmNiC2 whose crystal structure has no inversion symmetry shows Charge-Density-Wave(CDW) breaking with cooling at Curie Temperature. Interested in this phenomenon, we made single crystals with good quality for many kinds of RNiC2 (R=La, Ce, Pr, Nd, Sm, Gd, Dy, Y, Ho, Er), and measured physical and structural properties. We found two kinds of modulated structures whose wave vector are incommensurate ( 0.5 0.52, 0) and commensurate (0.5 0.5 0.5). Both superstructure were stabilized by lattice parameter shrinkage i. e, the formation temperature of CDW increases with the atomic number. Between Pr and Gd, there is only incommensurate superstructure with resistivity upturn(CDW) and the CDW was destroyed by the external field for at least R=Nd, Sm, Gd. For Dy and Y the competition among two superstructure was observed around room temperature. R=Ho and Er compounds show only the commensurate superlattice above room temperature.
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Exploration of new functionalities and fablication of composite films of ferroelectric organic conductors polarized by crystallization of correlated electrons
Grant number：23550170 2011.04 - 2015.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
YAMAMOTO Kaoru, KONDO Ryusuke
Grant amount：\5070000 （ Direct expense: \3900000 、 Indirect expense：\1170000 ）
Ferroelecrics polarized by electronic polarization draw attentions of researchers. We have claimed that an organic conductor α-(BEDT-TTF)2I3 and its relatives are the matters exemplifying the idea of the novel class of ferroelectrics. In the present research, we performed dielectric constant measurements of α'-(BEDT-TTF)2IBr2 for radio frequency, and pyroelectric current measurement in α'-(BEDT-TTF)2I3 using an ac method by modulating sample temperature.
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Novel dynamics of quantum condensate investigated by local micorwave complex conductivity measurement
Grant number：23244070 2011.04 - 2015.03
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
MAEDA Atsutaka, KATO Yusuke, IMAI Yoshinori, HANAGURI Tetsuo, KONDO Ryusuke, FUKATSU Susumu, YASUTAKE Yusuke, TAKAHASHI Hideyuki
Grant amount：\47970000 （ Direct expense: \36900000 、 Indirect expense：\11070000 ）
It is important for modern scanning microwave microscope to overcome an influence of the surface roughness. Here we report microwave imaging of phase-separated iron chalcogenide KxFeySe2 (x = 0.8, y = 1.6 - 2) using scanning tunneling/microwave microscope developed by ourselves, distinguishing electric contrast from topography-induced contrast using STM/SMM. We successfully observed the characteristic modulation of local electric property originating from mesoscopic phase separation of the metallic and the semiconducting phase in two different scanning modes; constant current mode and constant Q mode. In particular, the constant Q scanning is turned to be extremely useful because we can get an qualitative image in which topographic contrast is largely eliminated without degradation of the spatial resolution. This technique, with a further improvement, should introduce novel aspect for condensed matter physics reseraches.
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Development of tunneling spectroscopy on Dirac electron system
Grant number：23740255 2011 - 2012
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
KONDO Ryusuke
Grant amount：\4550000 （ Direct expense: \3500000 、 Indirect expense：\1050000 ）
In order to investigate features of Dirac electron system realized both in the organic conductor, α-(BEDT-TTF)2I3, under pressure and on the surface of the topological insulator, Bi2Se3, tunneling spectroscopy techniques under magnetic fields are developed. As the results, the synthetic methods for high-quality samples of carrier-compensated Bi2Se3, and a strong candidate for a topological superconductor, Cu-intercalated Bi2Se3, and problems of tunneling spectroscopy on the above materials by the point-contact method are revealed.
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Interplay of Charge ordered state and superconductivity in organic conductors
Grant number：21740244 2008 - 2010
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)
KONDO Ryusuke
Grant amount：\4550000 （ Direct expense: \3500000 、 Indirect expense：\1050000 ）
To investigate the interplay of charge ordered insulating state and superconductivity (Metallic phase), electronic and structural properties of α-, θ-, and β"-type organic conductors were studied under hydrostatic pressure and uniaxial strain. We found two cases ; I) a metallic phase having strong charge fluctuation located neighboring the charge ordered insulating phase (COI), and II) a charge ordered metallic state existed between COI and the metallic phase.
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一軸性延伸法の開発とその有機導体研究への適用
Grant number：18740193 2006 - 2007
日本学術振興会 科学研究費助成事業 若手研究(B)
近藤 隆祐
Grant amount：\3400000 （ Direct expense: \3400000 ）
試料の形状に囚われずに、有機導体のような柔らかい結晶に一軸的な延伸を印加するための方法の開発及び有機物に対する適用を行った。昨年度の研究により提案した方法で試料に延伸を印加することが可能なことが判明したため、今年度は昨年度に得られた結果の外部公表(論文投稿)、延伸印加下における構造解析実験の開発及び適用物質の拡充を重点的に遂行した。
I)延伸印加下における構造解析実験
低温X線構造解析装置に取り付け可能な構造解析可能な一軸延伸ホルダーの製作を行った。試料に対する見込み角は150度ほど取ることが出来た。昨年度の予備測定において物性変化が見出されたTMTSF系の試料に対して、一軸延伸下における構造解析を試みた。延伸印加前はブラッグスポットが観測されていたのにもかかわらず、延伸下においてはこれが消えることが判明した。これは試料中に乱れが生じていると考えられ、この系において、構造と物性の関係を調べることが難しいことが示唆された。
II)適用物質の拡充
他の有望な物質系としてβ"型分子配列を持つ有機導体を選択した。実験を遂行する前に、基底状態が不明だったβ"-(BEDT-TTF)2CsCd(SCN)4のそれを調べた結果、電荷密度相であることを明らかにした。延伸実験は現在遂行中である。
最後に、本研究で作成した低温における延伸を印加する試料ホルダーを使用して、"有機超伝導体を用いた超伝導接合の作成"の実験を遂行したことを付記しておく。 -
高圧縮された有機導体の構造と電子状態
Grant number：15073205 2003 - 2008
日本学術振興会 科学研究費助成事業 特定領域研究
鹿児島 誠一, 松下 信之, 近藤 隆祐
Grant amount：\33800000 （ Direct expense: \33800000 ）
この研究の目的は, 有機導体を一軸性圧縮と静水圧によって高度に圧縮し, 常圧とはまったく違う新構造と電子状態を実現してそこに現れる新規電子状態を探索するとともに, 有機導体の超伝導などの電子状態の制御と設計を試みることである。バンドが1/4だけ詰まり電荷秩序の自由度を持つ2次元性の物質について, 金属性, 超伝導, 電荷秩序の相互関係を系統的に調べた。
θ-(BEDT-TTF)_2CsZn(SCN)_4, β"-(DODHT)_2PF_6, およびβ"-(BEDT-TTF)_2CsCd(SCN)_4が共通の性質を持つことを明らかにし, 電荷秩序相と金属・超伝導相の安定領域を解明するとともに, それらの中間に, 電荷揺らぎ相とでも呼ぶべき中間状態があることを発見した。中間相において非線形電気伝導を詳しく調べ, 非線形伝導にともなってメモリ効果があること, および, メモリ効果は電荷秩序と関係して結晶構造のわずかな歪を伴うというモデルを提唱した。今後に残された課題は, 中間相の電子状態の本質を解明することである。α-(BEDT-TTF)_2I_3においては, 伝導面内でひとつの方向に一軸性圧縮を加えると2次元電子ポケットのサイズが極めて小さくなることを発見し, その状態での結晶構造を明らかにした。A5班の鈴村らの理論研究により, この状態は質量のない2次元ディラック電子状態であることが発見された。これは電子物性研究における大きな発見であり, 1軸性圧縮によって初めて可能になったものである。
このほか一軸性延伸技法を開発し, また, ロシアのグループとの共同によって4種類の有機導体を20GPaの超高圧まで圧縮し, 常温で2端子電気抵抗, 熱電能および圧縮率の測定に成功した。 -
CONTROL OF ELECTRONIC STATES OF ORGANIC SUPERCONDUCTORS BY UNIAXIAL STRAIN METHOD
Grant number：14204033 2002 - 2004
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
KAGOSHIMA Seiichi, KONDO Ryusuke, MAESATO Mitsuhiko, IMAKUBO Tatsuro
Grant amount：\54730000 （ Direct expense: \42100000 、 Indirect expense：\12630000 ）
This research aims to reveal the relationship among superconductivity and various types of electronic state of organic superconductors by uniaxially compressing crystalline lattices only along the desired direction and controlling their crystal and electronic structures.
In a series of organic conductors having a quarter-filled conduction band with the strong Coulomb correlation, the relationship among the metallic, charge-ordered, and superconducting states were clarified by systematic investigations of electrical transport properties, crystal and electronic structures under the uniaxial strain. We found that the band structure predominated the electronic state of α-(BEDT-TTF)_2XHg(SCN)_4, (X=K,NH_4). In θ-(BEDT-TTF)_2CsZn(SCN)_4,the newly synthesized α-(BEDT-TTF)_2CsCd(SCN)_4 and β-(BEDT-TTF)_2CsCd(SCN)_4,and β''-(DODHT)_2PF_6 synthesized by the Tokyo Metropolitan University group, however, their electronic states were found to be dominated by the charge ordering due to the long range Coulomb correlation. These results lead to a unified phase diagram of the electronic states of α-,θ-and β-types of organic conductor, In the half-filled band system, K-(BEDT-TTF)_2X [X=Cu(NCS)_2,Cu[N(CN)_2]Br,Cu_2(CN)_3] the on-site Coulomb correlation causes the Mott insulating state. We found that the deformation of their triangular lattice by the uniaxial compression controlled the electronic states and the spin-firustrating state to realize an increase in the superconducting critical temperature and a nonmagnetic spin state. These results suggested the importance of the spin fluctuations for the mechanism of superconductivity.
In the development of new materials, we turned our attention to the intermolecular interaction of the iodine bonding and the hydrogen bonding of CH・・・O type to make the supramolecular structure that gives rise to new supramolecular conducting and superconducting materials. We developed a safe method to synthesize [1,3] diselenole derivative that served as a basic reagent for new materials syntheses and succeeded in synthesizing TTF derivatives having selenium. We developed also a series of crystals of supramolecular organic conductors that had effective arrangements of anisotropic molecular interactions based on the iodine bonding. We succeeded in synthesizing BEDO-TSeF, the last unexplored molecule belonging to the family of BEDT-TTF derivative and clarifying its basic structural and electronic basic properties. -
Novel Electronic States in the Soft Lattice of Organic Conductors from the Control to the Design of Electronic States
Grant number：10102004 1998 - 2001
Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted Research
KAGOSHIMA Seiichi, KONDO Ryusuke
Grant amount：\144500000 （ Direct expense: \137000000 、 Indirect expense：\7500000 ）
Organic conductors are soft and suffer changes in crystal structure of not only the molecular position but also the molecular orientation. The purpose of this study is to reveal the relationship between changes in crystal structure and electronic properties of organic conductors at low temperature under structural controls by "uniaxial compression". This leads to a control and a design of organic compounds, which have a rich variety in structure and electronic properties.
We succeeded to develop the experimental method of uniaxial compression for transport and low-temperature x-ray diffraction measurements. Using this method, we measured electrical resistance, magnetoresistance and low temperature crystal structure of quasi two-dimensional conductors α-(BEDT-TTF)_2XHg(SCN)_4 where X=K and X=NH_4. In relation to superconductivity, we found an increase in the superconducting critical temperature from 1.5K of ambient pressure to 6K under the uniaixial compression parallel to the c-axis. The electronic structure derived by x-ray structure analyses was found to be semi-quantitatively consistent with theoretical expectation for the critical temperature by BCS theory. This result remonstrated the feasibility of the uniaxial compression method for the first time. We discovered also a novel magnetoresistance phenomenon in studies at hydrostatic pressures and named it "small closed-orbit effect".
We measured also uniaxial strain effects in related materials like the β- and θ-type BEDT-TTF series and BO series of organic conductors. Changes in electronic properties were found to occur as expected. However, we discovered some novel phenomena to be investigated in future studies. We tried also a material design using organic acceptors to succeed in synthesizing original organic superconductor (BETS)_2(Cl_2TCNQ). This is the first organic superconductor composed of only organic molecules.
The uniaxial strain method developed in this research is expected to be useful in controlling Coulomb correlation between electrons and to be applied also to magnetic and optical measurements.
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