Updated on 2022/07/02

写真a

 
ARAKI Shingo
 
Organization
Faculty of Natural Science and Technology Associate Professor
Position
Associate Professor
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Degree

  • Doctor (Science) ( Osaka University )

Research Interests

  • Strongly Correlated Electron System

  • 強相関物理学

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

Education

  • Osaka University   理学研究科   物理学専攻

    - 2001

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    Country: Japan

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  • Osaka University    

    - 2001

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  • Osaka University   理学部   物理学科

    - 1996

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    Country: Japan

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  • Osaka University    

    - 1996

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Research History

  • - 岡山大学自然科学研究科 准教授

    2009

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

    2009

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  • Osaka University

    2007 - 2009

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  • Assistant Professor,Osaka University

    2007 - 2009

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  • Osaka University

    2003 - 2007

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  • Research Associate,Osaka University

    2003 - 2007

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  • 日本原子力研究所 研究員

    2002 - 2003

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  • Researcher,Japan Atomic Energy Research Institute

    2002 - 2003

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  • 大阪大学 日本学術振興会特別研究員

    2001 - 2002

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  • Postdoctoral Fellowships of Japan Society for the Promotion of Science,Osaka University

    2001 - 2002

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Professional Memberships

 

Papers

  • Anomalous Hall effect triggered by pressure-induced magnetic phase transition in α-Mn

    Kazuto Akiba, Kaisei Iwamoto, Takaaki Sato, Shingo Araki, Tatsuo C. Kobayashi

    Physical Review Research   2 ( 4 )   2020.10

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

    DOI: 10.1103/physrevresearch.2.043090

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.2.043090/fulltext

  • Destabilization of hidden order in URu2Si2 under magnetic field and pressure

    W. Knafo, S. Araki, G. Lapertot, D. Aoki, G. Knebel, D. Braithwaite

    Nature Physics   16 ( 9 )   942 - 948   2020.9

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

    DOI: 10.1038/s41567-020-0927-4

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    Other Link: http://www.nature.com/articles/s41567-020-0927-4

  • Two Qualitatively Different Superconducting Phases under High Pressure in Single-Crystalline CeNiGe3

    Shunsaku Kitagawa, Shingo Araki, Tatsuo C. Kobayashi, Yoichi Ikeda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   89 ( 6 )   2020.6

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PHYSICAL SOC JAPAN  

    We have measured the temperature dependence of resistivity in single-crystalline CeNiGe3 under hydrostatic pressure in order to establish the characteristic pressure-temperature phase diagram. The transition temperature to AFM-I phase T-N1 = 5.5 K at ambient pressure initially increases with increasing pressure and has a maximum at similar to 3.0GPa. Above 2.3 GPa, a clear zero-resistivity is observed (SC-I phase) and this superconducting (SC) state coexists with AFM-I phase. The SC-I phase suddenly disappears at 3.7 GPa simultaneously with the appearance of an additional kink anomaly corresponding to the phase transition to AFM-II phase. The AFM-II phase is continuously suppressed with further increasing pressure and disappears at similar to 6.5 GPa. In the narrow range near the critical pressure, an SC phase reappears (SC-II phase). A large initial slope of upper critical field mu H-0(c2) and non-Fermi liquid behavior indicate that the SC-II phase is mediated by antiferromagnetic fluctuations. On the other hand, the robust coexistence of the SC-I phase and AFM-I phase is unusual on the contrary to superconductivity near a quantum critical point on most of heavy-fermion compounds.

    DOI: 10.7566/JPSJ.89.063702

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  • Pressure-Temperature Phase Diagram of \(\alpha \)-Mn

    Takaaki Sato, Kazuto Akiba, Shingo Araki, Tatsuo C. Kobayashi

    Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)   2020.3

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    Publishing type:Research paper (international conference proceedings)   Publisher:Journal of the Physical Society of Japan  

    DOI: 10.7566/jpscp.30.011030

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  • Field-angular Dependence of Pairing Interaction in URhGe: Comparison with UCoGe Reviewed

    Yo Tokunaga, Dai Aoki, Hadrien Mayaffre, Steffen Krämer, Marc-Henri Julien, Claude Berthier, Mladen Horvatić, Hironori Sakai, Shinsaku Kambe, Taisuke Hattori, Shingo Araki

    JPS Conf. Proc.   30   011037-1 - 011037-6   2020.3

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    DOI: 10.7566/JPSCP.30.011037

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  • Helimagnetic Structure and Heavy-Fermion-Like Behavior in the Vicinity of the Quantum Critical Point in Mn3P

    Hisashi Kotegawa, Masaaki Matsuda, Feng Ye, Yuki Tani, Kohei Uda, Yoshiki Kuwata, Hideki Tou, Eiichi Matsuoka, Hitoshi Sugawara, Takahiro Sakurai, Hitoshi Ohta, Hisatomo Harima, Keiki Takeda, Junichi Hayashi, Shingo Araki, Tatsuo C. Kobayashi

    PHYSICAL REVIEW LETTERS   124 ( 8 )   2020.2

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    Antiferromagnet Mn3P with Neel temperature T-N = 30 K is composed of Mn tetrahedrons and zigzag chains formed by three inequivalent Mn sites. Due to the nearly frustrated lattice with many short Mn-Mn bonds, competition of the exchange interactions is expected. We here investigate the magnetic structure and physical properties including pressure effect in single crystals of this material, and reveal a complex yet well-ordered helimagnetic structure. The itinerant character of this materials is strong, and the ordered state with small magnetic moments is easily suppressed under pressure, exhibiting a quantum critical point at similar to 1.6 GPa. The remarkable mass renormalization, even in the ordered state, and an incoherent-coherent crossover in the low-temperature region, characterize an unusual electronic state in Mn3P, which is most likely effected by the underlying frustration effect.

    DOI: 10.1103/PhysRevLett.124.087202

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.124.087202/fulltext

  • Ferromagnetism of potassium metal under pressure loading into zeolite low-silica X

    Shingo Araki, Nguyen Hoang Nam, Kota Shimodo, Takehito Nakano, Yasuo Nozue

    Physical Review B   99 ( 9 )   2019.3

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

    DOI: 10.1103/physrevb.99.094403

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.99.094403/fulltext

  • Field-induced reentrant superconductivity driven by quantum tricritical fluctuations in URhGe

    Y. Tokunaga, D. Aoki, H. Mayaffre, S. Krämer, M. H. Julien, C. Berthier, M. Horvatić, H. Sakai, T. Hattori, S. Kambe, S. Araki

    Physica B: Condensed Matter   536   122 - 124   2018.5

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    We review our 59Co NMR study in a URhGe single crystal doped with 10% cobalt. The spin-spin relaxation time (T2) measurements have revealed a divergence of electronic spin fluctuations in the vicinity of a field-induced tricritical point (TCP) locating around 13 T. The fluctuations is developed in the same limited field region around the TCP as that where a reentrant superconductivity (RSC) is observed in URhGe. The finding strongly suggests these quantum fluctuations as the pairing glue responsible for the RSC.

    DOI: 10.1016/j.physb.2017.09.022

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  • Pressure-Induced Superconductivity from Doping-Induced Antiferromagnetic Phase of 112-type Ca1-xLaxFeAs2

    Shunsaku Kitagawa, Taishi Sekiya, Yo Fujiyoshi, Shingo Araki, Tatsuo C. Kobayashi, Naoki Nishimoto, Tasuku Mizukami, Satoshi Ioka, Kazunori Fujimura, Kazutaka Kudo, Minoru Nohara

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   86 ( 11 )   1191 - 1196   2017.11

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    The effects of pressure on antiferromagnetic (AFM) and superconducting phase transitions of 112-type Ca1-xLaxFeAs2 were studied, and the in-plane electrical resistivity rho(ab) was measured with an indenter-type pressure cell. The AFM phase transition temperatures of T-N = 47, 63, and 63 K at ambient pressure for x = 0.18, 0.21, and 0.26 was suppressed by applying pressure P, with superconductivity emerging at critical pressures of P-c similar or equal to 0, 1.5, and 3.4 GPa, respectively. Correspondingly, the slope of T-N against P decreased as dT(N)/P similar or equal to -15 and -2K/GPa for x = 0.21 and 0.26, respectively. Thus, although the AFM phase was stabilized with La doping x, the AFM phase was suppressed by pressure, and superconductivity eventually emerged.

    DOI: 10.7566/JPSJ.86.113705

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  • Interplay between quantum fluctuations and reentrant superconductivity with a highly enhanced upper critical field in URhGe

    Y. Tokunaga, D. Aoki, H. Mayaffre, S. Kramer, M. -H. Julien, C. Berthier, M. Horvatic, H. Sakai, T. Hattori, S. Kambe, S. Araki

    PHYSICAL REVIEW B   93 ( 20 )   2016.5

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    The ferromagnetic superconductor URhGe has been known to exhibit an extremely large enhancement of the upper critical field when the field is confined and rotated in the (ab) crystal plane. Our high-field Co-59 NMR measurements on 10% Co-doped URhGe up to 30 T prove that this unconventional behavior of the superconductivity (SC) is associated with a strong anisotropy of field-dependent quantum fluctuations near a tricritical point. These fluctuations are rapidly suppressed by the field component along the c axis, while being unaffected by any field component along the a axis. The observed close interplay between the SC and quantum fluctuations strongly supports a pairing mechanism mediated by these fluctuations in URhGe.

    DOI: 10.1103/PhysRevB.93.201112

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  • Characteristic Fermi surfaces and charge density wave in SrAl4 and related compounds with the BaAl4-type tetragonal structure

    Ai Nakamura, Taro Uejo, Hisatomo Harima, Shingo Araki, Tatsuo C. Kobayashi, Miho Nakashima, Yasushi Amako, Masato Hedo, Takao Nakama, Yoshichika Onuki

    JOURNAL OF ALLOYS AND COMPOUNDS   654   290 - 299   2016.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE SA  

    We succeeded in growing single crystals of SrAl4 and related compounds with the BaAl4-type tetragonal structure by the self-flux method, and measured the electrical resistivity, magnetic susceptibility, Hall coefficient, thermoelectric power, and de Haas-van Alphen (dHvA) effect. A plausible characteristic feature of the charge density wave (CDW) was observed below T-CDW = 243 K in SrAl4. We also studied an effect of pressure on the electronic state in SrAl4 by measuring the electrical resistivity and thermoelectric power. T-CDW is found to decrease with increasing pressure, with a rate of dT(CDW)/dP = -12.5 K/GPa. To clarify the Fermi surface nesting, we studied the Fermi surface in SrAl4, which is found to be different from the Fermi surfaces of the similar compounds SrGa4, BaGa4, and BaAl4 without CDW. The Fermi surfaces in these compounds were determined from the dHvA experiments, together with the energy band calculations. (C) 2015 Published by Elsevier B.V.

    DOI: 10.1016/j.jallcom.2015.08.193

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  • Quantum tricritical fluctuations driving mass enhancement and reentrant superconductivity in URhGe

    Y. Tokunaga, D. Aoki, H. Mayaffre, S. Kraemer, M. -H. Julien, C. Berthier, M. Horyatic, H. Sakai, S. Kambe, T. Hattori, S. Araki

    TMU INTERNATIONAL SYMPOSIUM ON NEW QUANTUM PHASES EMERGING FROM NOVEL CRYSTAL STRUCTURE   683 ( 1 )   2016

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IOP PUBLISHING LTD  

    The field-induced reentrant superconductivity (RSC) discovered near a quantum critical point (QCP) in a ferromagnetic superconductor URhGe highlights the close interplay between superconductivity and magnetism. While the origin of the RSC is broadly thought to be associated with quantum critical fluctuations, their exact nature had not been well identified. Here we review our recent Co-59 NMR study in a single crystal of URh0.9Co0.1Ge. Our measurements of the NMR spin-spin relaxation reveal a divergence of electronic spin fluctuations in the vicinity of the field-induced QCP at H-R approximate to 13 T. The fluctuations observed are characteristic of a tricritical point, followed by a phase bifurcation toward quantum wing-critical points. We show that these tricritical fluctuations enhance the effective mass of the conduction electrons and, further, drive the RSC near the H-R.

    DOI: 10.1088/1742-6596/683/1/012010

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  • 20pPSB-20 Magnetization measurement with Hall sensor under high pressure in CeAgSb_2

    Araki S., Mashiyama H., Fujiwara Y., Kitagawa S., Kobayashi T.C.

    Meeting Abstracts of the Physical Society of Japan   71   2124 - 2124   2016

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.71.1.0_2124

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  • 21pBL-13 Superconductivity near antiferromagnetic quantum critical point in CeNiGe_3

    Kitagawa S., Araki S., Kobayashi T. C., Ikeda Y., Yoshizawa H.

    Meeting Abstracts of the Physical Society of Japan   71   2294 - 2294   2016

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.71.1.0_2294

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  • 22aPS-34 Crystal synthesis and high pressure effect on rare earth ferromagnetic Bi_3R_4 with noncentrosymmetric cubic structure.

    Sogabe Y., Furutani A., Araki S., Sekiya T., Kitagawa S., Kobayashi T. C., Inada Y.

    Meeting Abstracts of the Physical Society of Japan   71   2427 - 2427   2016

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.71.1.0_2427

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  • 20pPSB-21 Pressure Effect in Ferromagnetic CeNiSb_2

    Imai K., Sekiya T., Kitagawa S., Araki S., Kobayashi T. C., Onuki Y.

    Meeting Abstracts of the Physical Society of Japan   71   2125 - 2125   2016

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.71.1.0_2125

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  • Hall Effect in CeIn3 under High Pressure

    Shingo Araki, Taiki Onji, Shunsaku Kitagawa, Tatsuo C. Kobayashi, Takashi Kambe

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   84 ( 12 )   123702   2015.12

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    The temperature dependence of the Hall coefficient of CeIn3 under high pressure has been investigated. The absolute value of the Hall coefficient shows an anomalous increase below T* similar to 80K at ambient pressure. The increase in T* with increasing pressure is similar to the pressure dependence of the characteristic temperature where the resistivity reaches its maximum. The temperature variations below T* at various pressures are well scaled on a single curve that is the formula based on the two-fluid model. No effect of the antiferromagnetic fluctuations observed in CeTIn5 (T = Co, Rh, and Ir) is observed above 2K even near the critical pressure where antiferromagnetic ordering disappears.

    DOI: 10.7566/JPSJ.84.123702

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  • Suppression of Nonmagnetic Insulating State by Application of Pressure in Mineral Tetrahedrite Cu12Sb4S13

    Shunsaku Kitagawa, Taishi Sekiya, Shingo Araki, Tatsuo C. Kobayashi, Kenji Ishida, Takashi Kambe, Takumi Kimura, Naoki Nishimoto, Kazutaka Kudo, Minoru Nohara

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   84 ( 9 )   093701-1-093701-4   2015.9

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    The mineral tetrahedrite Cu12Sb4S13 exhibits a first-order metal-insulator transition (MIT) at T-MI = 85K and ambient pressure. We measured the 63Cu-NMR at ambient pressure and the resistivity and magnetic susceptibility at high pressures. Cu-63-NMR results indicate a nonmagnetic insulating ground state in this compound. The MIT is monotonically suppressed by pressure and disappears at similar to 1.0 GPa. Two other anomalies are observed in the resistivity measurements, and the pressure-temperature phase diagram of Cu12Sb4S13 is constructed.

    DOI: 10.7566/JPSJ.84.093701

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  • Reentrant Superconductivity Driven by Quantum Tricritical Fluctuations in URhGe: Evidence from Co-59 NMR in URh0.9Co0.1Ge

    Y. Tokunaga, D. Aoki, H. Mayaffre, S. Kraemer, M. -H. Julien, C. Berthier, M. Horvatic, H. Sakai, S. Kambe, S. Araki

    PHYSICAL REVIEW LETTERS   114 ( 21 )   216401-1-216401-5   2015.5

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    Our measurements of the Co-59 NMR spin-spin relaxation in URh0.9Co0.1Ge reveal a divergence of electronic spin fluctuations in the vicinity of the field-induced quantum critical point at H-R approximate to 13 T, around which reentrant superconductivity (RSC) occurs in the ferromagnetic heavy fermion compound URhGe. We map out the strength of spin fluctuations in the (H-b; H-c) plane of magnetic field components and show that critical fluctuations develop in the same limited region near the field HR as that where RSC is observed. This strongly suggests these quantum fluctuations as the pairing glue responsible for the RSC. The fluctuations observed are characteristic of a tricritical point, followed by a phase bifurcation toward quantum critical end points.

    DOI: 10.1103/PhysRevLett.114.216401

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  • Emergence of double-dome superconductivity in ammoniated metal-doped FeSe

    Masanari Izumi, Lu Zheng, Yusuke Sakai, Hidenori Goto, Masafumi Sakata, Yuki Nakamoto, Huyen L. T. Nguyen, Tomoko Kagayama, Katsuya Shimizu, Shingo Araki, Tatsuo C. Kobayashi, Takashi Kambe, Dachun Gu, Jing Guo, Jing Liu, Yanchun Li, Liling Sun, Kosmas Prassides, Yoshihiro Kubozono

    SCIENTIFIC REPORTS   5   9477-1-9477-7   2015.4

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    The pressure dependence of the superconducting transition temperature (T-c) and unit cell metrics of tetragonal (NH3)(y)Cs0.4FeSe were investigated in high pressures up to 41 GPa. The T-c decreases with increasing pressure up to 13 GPa, which can be clearly correlated with the pressure dependence of c (or FeSe layer spacing). The T-c vs. c plot is compared with those of various (NH3)(y)MxFeSe (M: metal atoms) materials exhibiting different T-c and c, showing that the T-c is universally related to c. This behaviour means that a decrease in two-dimensionality lowers the T-c. No superconductivity was observed down to 4.3 K in (NH3)(y)Cs0.4FeSe at 11 and 13 GPa. Surprisingly, superconductivity re-appeared rapidly above 13 GPa, with the T-c reaching 49 K at 21 GPa. The appearance of a new superconducting phase is not accompanied by a structural transition, as evidenced by pressure-dependent XRD. Furthermore, T-c slowly decreased with increasing pressure above 21 GPa, and at 41 GPa superconductivity disappeared entirely at temperatures above 4.9 K. The observation of a double-dome superconducting phase may provide a hint for pursuing the superconducting coupling-mechanism of ammoniated/non-ammoniated metal-doped FeSe.

    DOI: 10.1038/srep09477

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  • Pressure-Temperature-Field Phase Diagram in the Ferromagnet U3P4

    Shingo Araki, Minami Hayashida, Naoto Nishiumi, Hiroki Manabe, Yoichi Ikeda, Tatsuo C. Kobayashi, Keizo Murata, Yoshihiko Inada, Piotr Wisniewski, Dai Aoki, Yoshichika Onuki, Etsuji Yamamoto, Yoshinori Haga

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   84 ( 2 )   024705-1-024705-8   2015.2

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    The pressure-temperature-field phase diagram and quantum fluctuation effect were investigated in the itinerant ferromagnet U3P4 by resistivity, ac susceptibility, and Hall effect measurements under high pressure. The zero-temperature ferromagnetic-to-paramagnetic transition is located at P-c similar to 4.0 GPa. The tricritical point exists at P* = 3.8 GPa and T* = 32 K, where the ferromagnetic transition changes from second- to first-order. As a quantum fluctuation effect, the low-temperature resistivity at P-c follows T-5/3 dependence, which was theoretically described in the case of a three-dimensional ferromagnet. This result indicates that the ferromagnetic-to-paramagnetic transition at P-c may be considered as weakly first-order. Another critical behavior, the huge enhancement of rho(0) observed at P-c, cannot be interpreted as the ferromagnetic fluctuation effect. The Hall effect measurements suggest that the magnetic structure in the ordered state changes under high pressure.

    DOI: 10.7566/JPSJ.84.024705

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  • Resistance Anomalies Accompanying Crossover from Heavy-Fermion Regime to Intermediate-Valence Regime: A Study of Cu-Ni Substitution and Pressure Effects on CeCu2Si2

    Yoichi Ikeda, Yuzo Ito, Shingo Araki, Tatsuo C. Kobayashi, Hideki Yoshizawa

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   84 ( 2 )   024702-1-024702-9   2015

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    We present detailed investigations on the effects of Ni substitution (x) on Ce(Cu1-xNix)(2)Si-2 with x < 0.3, and a pressure (p) study for x = 0.04(2), 0.05(2), and 0.09(2) by resistivity measurements. The Cu-Ni substitution suppresses both antiferromagnetic fluctuations and superconductivity in CeCu2Si2, and leads to a dramatic crossover from the heavy-fermion (HF) regime to the intermediate-valence(IV) regime with progressive Ni doping. The crossover can be characterized by a marked increase in Kondo temperature evaluated from resistivity, specific heat, and susceptibility measurements. In high-pressure resistivity measurements, the Ni-doped system exhibits similar anomalies to those observed in CeCu2Si2, namely, T-linear dependence, an enhancement of residual resistivity, and a marked decrease in the A coefficient of the T-2-resistivity. Furthermore, we observed an unexpected upturn anomaly in resistivity in the Ni-doped system under high pressure. By constructing the x-p phase diagram of Ce(Cu1-xNix)(2)Si-2, we demonstrate that the crossover from the HF regime to the IV regime can be associated with these characteristic anomalies in resistivity.

    DOI: 10.7566/JPSJ.84.024702

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  • Characterization of Ferromagnetic Order in CePd2P2

    Y. Ikeda, H. Yoshizawa, S. Konishi, S. Araki, T. C. Kobayashi, T. Yokoo, S. Ito

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS 2014 (SCES2014)   592   012013-1-012013-6   2015

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    We examine magnetic ordering in CePd2P2 by neutron-scattering experiment and confirmed a ferromagnetic order at low temperatures. From the neutron-scattering data, the ordered moment is evaluated to be similar to 1.3(3) mu(B) per Ce ion at 3 K and is considered to be parallel to the c-axis. In addition, no evidence of the change in the magnetic structure was observed below T-C within the experimental accuracy. In DC magnetization measurement with an as-grown powder sample and a magnetically aligned sample, a clear magnetic anisotropy in CePd2P2 was observed in both ferromagnetic and paramagnetic phases. To obtain further insight to the large Curie temperature T-C of CePd2P2, we have examined the magnetic properties of GdPd2P2 as a reference material. In DC magnetization measurement, successive magnetic transitions at T-I = 10.6 K and T-II = 7.4 K were observed in GdPd2P2. By comparing the transition temperatures of the Ce and Gd compounds, we argue the origin of the large Curie temperature of CePd2P2.

    DOI: 10.1088/1742-6596/592/1/012013

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  • 17aPS-18 Hall effect in CeRh_2Si_2 under high pressure

    Araki S., Onji T., Kitagawa S., Kobayashi T. C., Miyazaki M., Settai R., Sakai H.

    Meeting Abstracts of the Physical Society of Japan   70   1814 - 1814   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_1814

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  • 17aDA-8 Pressure induced ferromagnetic quantum criticality on CeTiGe_3

    Kitagawa S., Kawashima G., Araki S., Kobayashi T. C., Inamdar M., Thamizhavel A., Dhar S. K.

    Meeting Abstracts of the Physical Society of Japan   70   1769 - 1769   2015

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

    DOI: 10.11316/jpsgaiyo.70.2.0_1769

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  • 18aDB-3 P-T-x phase diagram in the iron - based superconductor Ca_<1-x>La_xFeAs_2

    Sekiya T., Kitagawa S., Araki S., Kobayashi T. C., Nishimoto N., Ioka S., Fujimura K., Mizukami T., Kudo K., Nohara M.

    Meeting Abstracts of the Physical Society of Japan   70   1989 - 1989   2015

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    DOI: 10.11316/jpsgaiyo.70.2.0_1989

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  • Simultaneous suppression of superconductivity and structural phase transition under pressure in Ca-10(Ir4As8)(Fe2-xIrxAs2)(5)

    Shunsaku Kitagawa, Shingo Araki, Tatsuo C. Kobayashi, Hiroyuki Ishii, Kazunori Fujimura, Daisuke Mitsuoka, Kazutaka Kudo, Minoru Nohara

    PHYSICAL REVIEW B   90 ( 22 )   224513-1-224513-5   2014.12

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    We measured the pressure dependence of in-plane resistivity rho(ab) in the recently discovered iron-based superconductor Ca-10(Ir4As8)(Fe2-xIrxAs2)(5), which shows a unique structural phase transition in the absence of magnetic ordering, with a superconducting transition temperature T-c = 16 K and a structural phase transition temperature T-s similar or equal to 100 K at ambient pressure. T-c and T-s are suppressed on applying pressure and disappear at approximately 0.5 GPa, suggesting a relationship between superconductivity and structure. Ca-10(Ir4As8)(Fe2-xIrxAs2)(5) is a rather rare example in which the superconductivity appears only in a low-temperature ordered phase. The fact that the change in the crystal structure is directly linked with superconductivity suggests that the crystal structure as well as magnetism are important factors governing superconductivity in iron pnictides.

    DOI: 10.1103/PhysRevB.90.224513

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  • Superconducting phases in (NH3)(y)MxFeSe1-zTez (M = Li, Na, and Ca) Reviewed

    Sakai Yusuke, Zheng Lu, Izumi Masanari, Teranishi Kazuya, Eguchi Ritsuko, Goto Hidenori, Onji Taiki, Araki Shingo, Kobayashi Tatsuo C, Kubozono Yoshihiro

    PHYSICAL REVIEW B   89 ( 14 )   144509   2014.4

  • Charge Density Wave Transition in EuAl4

    Shingo Araki, Yoichi Ikeda, Tatsuo C. Kobayashi, Ai Nakamura, Yuichi Hiranaka, Masato Hedo, Takao Nakama, Yoshichika Onuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 1 )   015001-1-015001-2   2014.1

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  • Metamagnetic Transition of Itinerant Ferromagnet U3P4 under High Pressure

    Shingo Araki, Minami Hayashida, Naoto Nishiumi, Hiroki Manabe, Yoichi Ikeda, Tatsuo C. Kobayashi, Keizo Murata, Yoshihiko Inada, Piotr Wisniewski, Dai Aoki, Yoshichika Onuki, Etsuji Yamamoto, Yoshinori Haga

    JPS Conference Proceedings   3   011081-1-011081-6   2014

  • Pressure-Induced Magnetic Transition and Disappearance of Superconductivity in CeNiGe3

    Yoichi Ikeda, Takeshi Tomijima, Shingo Araki, Tatsuo C. Kobayashi, Keizo Murata

    JPS Conference Proceedings   3   015044-1-015044-6   2014

  • Superconductivity in (NH3)yCs0.4FeSe

    Lu Zheng, Masanari Izumi, Yusuke Sakai, Ritsuko Eguchi, Hidenori Goto, Yasuhiro Takabayashi, Takashi Kambe, Taiki Onji, Shingo Araki, Tatsuo C. Kobayashi, Jungeun Kim, Akihiko Fujiwara, Yoshihiro Kubozono

    Physical Review B - Condensed Matter and Materials Physics   88 ( 9 )   094521-1-094521-5   2013.9

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    Alkali-metal-intercalated FeSe materials, (NH3) yM0.4FeSe (M: K, Rb, and Cs), have been synthesized using the liquid NH3 technique. (NH3)yCs 0.4FeSe shows a superconducting transition temperature (T c) as high as 31.2 K, which is higher by 3.8 K than the Tc of nonammoniated Cs0.4FeSe. The Tcs of (NH 3)yK0.4FeSe and (NH3) yRb0.4FeSe are almost the same as those of nonammoniated K0.4FeSe and Rb0.4FeSe. The Tc of (NH 3)yCs0.4FeSe shows a negative pressure dependence. A clear correlation between Tc and lattice constant c is found for ammoniated metal-intercalated FeSe materials, suggesting a correlation between Fermi-surface nesting and superconductivity. © 2013 American Physical Society.

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  • Insulator-to-metal transition and magnetism of potassium metals loaded into regular cages of zeolite LSX

    Takehito Nakano, Duong Thi Hanh, Akihiro Owaki, Yasuo Nozue, Nguyen Hoang Nam, Shingo Araki

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   63 ( 3 )   512 - 516   2013.8

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    Zeolite LSX (low-silica X) crystals have an aluminosilicate framework with regular supercages and beta-cages. They are arrayed in a double diamond structure. The loading density of guest K atoms per supercage (or beta cage), n, can be controlled from 0 to a parts per thousand 9. At n &lt; 2, samples are nearly nonmagnetic and insulating. The Curie constant has a clear peak at n = 3, and the electrical resistivity suddenly decreases simultaneously. The electrical resistivity suddenly decreases again at n = 6 and shows metallic phase at n &gt; 6. These properties are explained by the polaron effect including the electron correlation. Ferrimagnetic properties are observed at n a parts per thousand 9. A remarkable increase in the resistivity is observed at very low temperatures at n a parts per thousand 9, and is discussed in terms of the hypothesis of a Kondo insulator.

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  • Longitudinal magnetoresistance of Ce(Cu1-xNix)2Si2

    Yoichi Ikeda, Shingo Araki, Tatsuo C. Kobayashi

    Journal of the Korean Physical Society   63 ( 3 )   766 - 767   2013.8

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    The longitudinal magnetoresistance (LMR) of polycrystalline Ce(Cu1-xNix)2Si2 samples is investigated between T = 2 and 15 K up to H = 80 kOe. The application of magnetic field induces anomalous temperature dependence of the resistivity with the power index n &lt
    2 for x = 0.12 and 0.14, in which ρ(T) obeys a T 2-law at H = 0 Oe. A sign-change of the LMR from positive (x &lt
    0.03) to negative (x &gt
    0.03) is observed at 2 K. The negative LMR at 80 kOe is maximized (∼ -4 % at T = 2 K) around x ∼ 0.10 and subsequently disappears at higher Ni concentrations. Disappearance of the positive LMR in lower x region and the negative LMR at higher Ni concentrations implies a collapse of a coherent Kondo lattice state, and a rapid enhancement of Kondo temperature, respectively. Anomalous quantum fluctuations are probably developed around x ∼ 0.10. © 2013 The Korean Physical Society.

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  • Exotic magnetism of s-electron cluster arrays: Ferromagnetism, ferrimagnetism and antiferromagnetism

    Takehito Nakano, Duong Thi Hanh, Yasuo Nozue, Nguyen Hoang Nam, Truong Cong Duan, Shingo Araki

    Journal of the Korean Physical Society   63 ( 3 )   699 - 705   2013.8

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    Alkali metal nanoclusters can be stabilized in the regular cages of zeolite crystals by the loading of guest alkali metals. Cages are connected by the sharing of windows of the framework, and arrayed in simple cubic, diamond and body centered cubic structures in zeolites A, X and sodalite, respectively. The s-electrons have the localized nature of nanoclusters with magnetic moments, and have mutual interactions through the windows of cages. They show exotic magnetism depending on the structure type of zeolites, the kind of alkali metals and the average loading density of alkali atoms per cage. In zeolite A, potassium clusters are formed in α-cages that have an inside diameter of 11 Å. They exhibit ferromagnetic properties explained by the canted antiferromagnetism of the Mott insulator, where the 1p-like degenerate orbitals of clusters play an essential role in the magnetic properties. Na-K alloy clusters generated at supercages and β-cages of low-silica X (LSX) zeolite exhibit Néel's N-type ferrimagnetism at specific loading densities of alkali metals. Alkali metal clusters in sodalite show the ideal Heisenberg antiferromagnetism of the Mott insulator. © 2013 The Korean Physical Society.

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  • Pressure effects on rattling and superconductivity in the Einstein solids

    Y. Ikeda, Y. Kawasaki, T. Shinohara, S. Araki, T. C. Kobayashi, A. Onosaka, Y. Okamoto, J. Yamaura, Z. Hiroi

    J. Phys. Soc. Jpn.   82   063707-1-4   2013

  • A Study of Ni-Substitution Effects on Heavy-Fermion CeCu2Si2 - Similarities between Ni Substitution and High-Pressure Effects -

    Yoichi Ikeda, Shingo Araki, Tatsuo C. Kobayashi, Yusei Shimizu, Tatsuya Yanagisawa, Hiroshi Amitsuka

    81 ( 8 )   083701-1-083701-4   2012.6

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    The effects of Ni substitution on Ce(Cu1-xNix)2Si2 have been studied by
    specific heat and electrical resistivity measurements. The specific heat
    measurement has revealed that the enhanced quantum fluctuations around an
    antiferromagnetic quantum critical point are markedly suppressed by Ni
    substitution, and that the Fermi liquid state recovers in the Nirich region (x
    > 0.12). The characteristic T-linear dependence of the resistivity has been
    observed at approximately x ~ 0.10 together with a sign of superconductivity.
    The variation of n in the form of rho - rho0 = aT^n against Tmax^1, at which
    the resistivity peaks, coincides with the case of high-pressure experiments on
    pure CeCu2Si2. The anomalous T-linear behavior appears to occur in the
    crossover region from the Kondo regime to the valence fluctuation regime rather
    than in the conventional antiferromagnetic quantum critical region.

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  • Iron-platinum-arsenide superconductors Ca-10(PtnAs8)(Fe2-xPtxAs2)(5)

    Minoru Nohara, Satomi Kakiya, Kazutaka Kudo, Yoshihiro Oshiro, Shingo Araki, Tatsuo C. Kobayashi, Kenta Oku, Eiji Nishibori, Hiroshi Sawa

    SOLID STATE COMMUNICATIONS   152 ( 8 )   635 - 639   2012.4

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    An overview of the crystal structures and physical properties of the recently discovered iron-platinum-arsenide superconductors, Ca-10(PtnAs8)(Fe2-xPtxAs2)(5) (n = 3 and 4), which have a superconducting transition temperature up to 38K, is provided. The crystal structure consists of superconducting Fe2As2 layers alternating with platinum-arsenic layers, PtnAs8. The upper critical field H-c2, hydrostatic pressure dependence of superconducting transition temperature T-c, and normal-state magnetic susceptibility are reported. (C) 2011 Elsevier Ltd. All rights reserved.

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  • Interplay of Superconductivity and Fermi-Liquid Transport in Rh-Doped CaFe2As2 with Lattice-Collapse Transition Reviewed

    Masataka Danura, Kazutaka Kudo, Yoshihiro Oshiro, Shingo Araki, Tatsuo C. Kobayashi, Minoru Nohara

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80 ( 10 )   2011.10

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    Ca(Fe1-xRhx)(2)As-2 undergoes successive phase transitions with increasing Rh doping in the T = 0 limit. The antiferromagnetic-metal phase with orthorhombic structure at 0.00 &lt;= x &lt;= 0.020 is driven to a superconducting phase with uncollapsed-tetragonal (ucT) structure at 0.020 &lt;= x &lt;= 0.024; a non-superconducting collapsed-tetragonal (cT) phase takes over at x &gt;= 0.024. The breakdown of Fermi-liquid transport is observed in the ucT phase above T-c. In the adjacent cT phase, Fermi-liquid transport is restored along with a disappearance of superconductivity. This interplay of superconductivity and Fermi-liquid transport suggests the essential role of magnetic fluctuations in the emergence of superconductivity in doped CaFe2As2.

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  • Pressure-induced structural phase transitions in UIr

    H. Kotegawa, S. Araki, T. Akazawa, A. Hori, Y. Irie, S. Fukushima, H. Hidaka, T. C. Kobayashi, K. Takeda, Y. Ohishi, K. Murata, E. Yamamoto, S. Ikeda, Y. Haga, R. Settai, Y. Onuki

    PHYSICAL REVIEW B   84 ( 5 )   054524-1-054524-5   2011.8

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    Strain and resistivity measurements in UIr showed the occurrence of two structural phase transitions under high pressure, indicating the existence of three phases I-III, with slightly different crystal structures. It is suggested that ferromagnetic phases FM1-FM3 emerge in phases I-III, respectively. The pressure-temperature phase diagram was sensitive to the hydrostaticity of pressure. FM3 and superconductivity are observed in the measurements in which Daphne 7373 is used as a pressure-transmitting medium; however they are both absent in the case where petroleum ether is used as a pressure-transmitting medium. These results indicate a close relationship between ferromagnetism and superconductivity.

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  • Heat Capacity and ac-Susceptibility Measurements of SmOs4Sb12 under High Pressure

    Tatsuo C. Kobayashi, Kazuki Miyazawa, Keisuke Tabira, Yoichi Ikeda, Shingo Araki, Hisashi Kotegawa, Hitoshi Sugawara, Daisuke Kikuchi, Hideyuki Sato

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   SA034-1-SA034-3   2011.7

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    Heat capacity and ac-susceptibility measurements under high pressure are carried out in SmOs4Sb12. Application of pressure increases the Curie temperature T-C and enhances the heat-capacity jump at T-C. On the other hand, the peak value of ac-susceptibility at T-C decreases above 1 GPa and then almost vanishes at 3.6 GPa. These experimental facts suggest that the ordered state in SmOs4Sb12 is not simple ferromagnetic state but possibly multipolar ordered state.

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  • Hall effect in CeCu2Si2 under pressure

    Shingo Araki, Yuki Shiroyama, Yoichi Ikeda, Tatsuo C. Kobayashi, Silvia Seiro, Christoph Geibel, Frank Steglich

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   80   SA061-1-SA061-3   2011.7

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    We report the results of Hall effect measurements on CeCu2Si2 under high pressures up to 4.8 GPa. The Hall coefficient at ambient pressure increases with decreasing temperature and exhibits maximum at 4 K. The Hall coefficient at temperature higher than the coherent temperature of 10 K is consistent with the anomalous Hall effect. The pressure effect on the temperature dependence of the Hall coefficient is not simple. The pressure dependence of the Hall coefficient shows anomaly from 3.1 to 4.8 GPa, where the superconductivity is enhanced. These results indicate the close relationship between the Hall coefficient and the superconductivity.

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  • Magnetic properties of Na-K clusters in low-silica X zeolite doped by pressure loading

    Nguyen Hoang Nam, Tatsuya Ohtsu, Takashi Araki, Shingo Araki, Yasuo Nozue

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009)   200 ( 1 )   012062-1-012062-4   2010

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    Low-silica X (LSX) zeolite has the FAU-type framework structure constructed of supercages and beta-cages with effective inside diameters of 13 and 7 angstrom, respectively. Respective cages are arrayed in a diamond structure. Na-K clusters are formed by the loading of guest potassium atoms nK into LSX, where the unloaded LSX has 4Na and 8K zeolite-cations per supercage (or beta-cage) as given by Na(4)K(8)Al(12)Si(12)O(48). N-type ferrimagnetism has been observed at ambient loading densities of K atoms, 6.5 &lt; n &lt; 8.5. Ferrimagnetism was not observed at the maximum loading density at ambient pressure, n approximate to 9. In the present study, we extended the loading density for 9 &lt; n by the pressure-loading technique. Spontaneous magnetization is observed again below 10.5 and 9.1 K at the loading pressures approximate to 400 and approximate to 520 MPa respectively. Respective Weiss temperatures are -23 and -32 K. These results indicate that the ferrimagnetism appears again at higher loading densities.

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  • Neutron magnetic scattering studies on ferromagnetism in potassium nanoclusters arrayed in zeolite A-Trial experiments

    T. Nakano, T. Takase, S. Araki, T. Kamiyama, Y. Nozue, S. Ikeda

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   600 ( 1 )   240 - 242   2009.2

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    Potassium clusters arrayed in zeolite A are known to show ferromagnetic properties at low temperature. The origin of the spontaneous magnetization has been explained by a model of spin-canting in an antiferromagnetically ordered state. The direct information for the magnetic structure, however, has not been obtained so far. In the present work, we measure the neutron powder diffraction by using pulsed neutron source at KEK-KENS below and above the Curie temperature. No significant temperature-dependence was, however. obtained within the statistical errors, namely, magnetic scattering could not be detected separately. We also estimate the intensity of magnetic scattering by assuming some possible magnetic structures with considering the magnetic form factor of the cluster wave function. The intensity of magnetic scattering is estimated to be extremely weak and higher SIN of similar to 10(4) or more is required to detect the magnetic scattering of this material. (c) 2008 Elsevier B.V. All rights reserved.

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  • Magnetism and crystalline electric field in RRhIn5 (R : rare earth)

    T. Takeuchi, N. V. Hieu, H. Shishido, C. Tonohiro, T. Yamada, K. Sugiyama, R. Settai, T. D. Matsuda, Y. Haga, M. Hagiwara, K. Kindo, S. Araki, Y. Nozue, Y. Onuki

    PHYSICA B-CONDENSED MATTER   403 ( 5-9 )   1023 - 1025   2008.4

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    We studied systematically a series of the ternary compounds RRhIn5 (R: rare earth) which were grown in the single crystalline form by means of the flux method. Most of these compounds order antiferromagnetically at low temperatures, except for R = Y, La, Pr and Yb. The observed temperature dependence of the specific heat and the anisotropic features in the magnetic susceptibility and magnetization have been analyzed on the basis of the crystalline electric field (CEF) model, and an interesting relationship between the anisotropic exchange interaction and the CEF effect is obtained for RRhIn5 compounds. (c) 2007 Elsevier B.V. All rights reserved.

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  • Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3: An In-115-NQR study under pressure

    S. Kawasaki, M. Yashima, Y. Kitaoka, K. Takeda, K. Shimizu, Y. Oishi, M. Takata, T. C. Kobayashi, H. Harima, S. Araki, H. Shishido, R. Settai, Y. Onuki

    PHYSICAL REVIEW B   77 ( 6 )   064508-1-064508-12   2008.2

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    We report on pressure-induced unconventional superconductivity (SC) in the heavy-fermion (HF) antiferromagnet CeIn3 by means of nuclear-quadrupole-resonance (NQR) studies conducted under a high pressure. The temperature (T) and pressure (P) dependences of the In-NQR spectra have revealed a first-order quantum-phase transition (QPT) from antiferromagnetism (AFM) to paramagnetism (PM) at a critical pressure P-c=2.46 GPa at which AFM disappears with a minimum value of T-N(P-c)=1.2 K. High-energy x-ray scattering measurements under P show a progressive decrease in the lattice density without any change in the crystal structure, whereas an increase in the NQR frequency (nu(Q)) indicates an increase in the hybridization between 4f electrons and conduction electrons, which stabilizes the HF-PM state. This competition between the AFM phase where T-N is reduced and the formation of the HF-PM phase triggers the first-order QPT at P-c=2.46 GPa. Despite the lack of an AFM quantum critical point in the P-T phase diagram, we highlight the fact that unconventional SC occurs in both phases of AFM and PM. The measurements of the nuclear spin-lattice relaxation rate 1/T-1 in the AFM phase have provided evidence for the uniformly coexisting AFM+SC phase. Remarkably, the significant increase in 1/T-1 upon cooling in the AFM phase has revealed the development of low-lying magnetic excitations down to T-c in the AFM phase; it is indeed relevant to the onset of the uniformly coexisting AFM+SC phase. In the HF-PM phase where AFM fluctuations are not developed, 1/T-1 decreases without the coherence peak just below T-c, followed by a power-law-like T dependence that indicates an unconventional SC with a line-node gap. Remarkably, T-c has a peak around P-c in the HF-PM phase as well as in the AFM phase. In other words, an SC dome exists with a maximum value of T-c=230 mK around P-c, indicating that the origin of the pressure-induced HF SC in CeIn3 is not relevant to AFM spin fluctuations but to the emergence of the first-order QPT in CeIn3. These phenomena observed in CeIn3 should be understood in terms of the first-order QPT because these new phases of matter are induced by applying P. When the AFM critical temperature is suppressed at the termination point of the first-order QPT, P-c=2.46 GPa, the diverging AFM spin-density fluctuations emerge at the critical point from AFM to PM. The results with CeIn3 leading to a new type of quantum criticality deserve further theoretical investigations.

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  • Magnetic properties and crystalline electric field scheme in RRhIn5 (R : rare earth)

    Nguyen Van Hieu, Tetsuya Takeuchi, Hiroaki Shishido, Chie Tonohiro, Tsutomu Yamada, Hiroshi Nakashima, Kiyohiro Sugiyama, Rikio Settai, Tatsuma D. Matsuda, Yoshinori Haga, Masayuki Hagiwara, Koichi Kindo, Shingo Araki, Yasuo Nozue, Yoshichika Onuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 6 )   064702-1-064702-16   2007.6

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    A series of ternary compounds RRhIn5 (R: rare earth) has been grown in the single crystalline form by means of the flux method. The magnetic properties of these compounds were investigated by measuring the lattice parameter, electrical resistivity, specific heat, magnetic susceptibility and magnetization. All the compounds crystallize in the tetragonal HoCoGa5-type structure. Most of these compounds order antiferromagnetically at low temperatures, except when R = Y, La, Pr, and Yb. The observed temperature dependence of the specific heat and the anisotropic features in the magnetic susceptibility and magnetization have been analyzed on the basis of the crystalline electric field (CEF) model. The overall energy splitting of the CEF scheme in RRhIn5 is estimated to be in the range from 44 to 330 K. The magnetic properties are discussed on the basis of the sign of the CEF parameter.

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  • Magnetic property of potassium clusters in pressure-doped zeolite A

    N. H. Nam, S. Araki, H. Shiraga, S. Kawasaki, Y. Nozue

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   1016 - 1018   2007.3

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    The pressure-doping technique was developed for further loading of guest potassium metal into porous crystals of zeolite beyond the upper limit at ambient pressure. A doping pressure dependence of the magnetic property of potassium clusters in cages of zeolite A is measured up to 320 MPa. The Curie constant monotonically decreases with increase in the doping pressure and shows very small values above 250 MPa. The magnetic susceptibility at 2 K, however, gradually increases and has a peak at 200 MPa. Observed decrease in the Curie constant is explained by the increase in the loading density of potassium. Simultaneously, the increase in the magnetic susceptibility at 2 K is explained by the superparamagnetism of ferromagnetic domains. A possible mechanism of change in the magnetic properties is discussed. (c) 2006 Elsevier B.V. All rights reserved.

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  • Drastic change of the electronic states at the quantum critical point in heavy fermions

    R. Settai, H. Shishido, T. Kubo, S. Araki, T. C. Kobayashi, H. Harima, Y. Onuki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   541 - 547   2007.3

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    We studied the change of the Fermi surface properties in antiferromagnets CeIn3 and CeRhIn5 via the dHvA experiments under pressure. We found the abrupt change of the Fermi surface at the critical pressure P-c, where the magnetic ordering state changes to the paramagnetic one. The change of the Fermi surface indicates that the 4f-electron character is changed from localized to itinerant in CeIn3 and CeRhIn5 at P-c. Namely, the 4f-electron contributes to the volume of the Fermi surface above P-c. Interestingly, the pressure-induced heavy fermion state with large effective mass was observed around P-c, where the pressure-induced superconductivity appears. We also discuss the Fermi surface properties in the system without inversion symmetry in the crystal structure as in CePt3Si and CeTX3 (T:Co, Ir, Rh, X: Si, Ge). The spin-orbit interaction due to the lack of inversion symmetry brings about a splitting of the Fermi surface, which is important for considering the formation of Cooper pair. (c) 2006 Elsevier B.V. All rights reserved.

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  • 115In-NQR study of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3 under pressure

    S. Kawasaki, M. Yashima, H. Kotegawa, T. Mito, Y. Kawasaki, G. Q. Zheng, Y. Kitaoka, H. Shishido, S. Araki, D. Aoki, Y. Haga, R. Settai, Y. Onuki

    Journal of Physics and Chemistry of Solids   67 ( 1-3 )   497 - 499   2006.1

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    We report the novel phase diagram of superconductivity (SC) and antiferromagnetism (AFM) in heavy-fermion (HF) pressure(P)-induced superconductors CeRhIn5 and CeIn5 through nuclear-quadrupole-resonance (NQR) measurements under P. The P-induced superconductivity in CeRhIn5 coexists with AFM on a microscopic level in P=1.5-1.9 GPa. By contrast, in CeIn3, the P-induced phase separation of AFM and paramagnetism (PM) takes place without any trace of a quantum phase transition. The outstanding finding is that SC sets in at both the phases magnetically separated into AFM and PM in P=2.28-2.5 GPa. © 2005 Elsevier Ltd. All rights reserved.

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  • Fermi surface and magnetic properties of PrTIn<inf>5</inf> (T: Co, Rh, and Ir)

    Nguyen Van Hieu, Hiroaki Shishido, Arumugam Thamizhavel, Rikio Settai, Shingo Araki, Yasuo Nozue, Tatsuma D. Matsuda, Yoshinori Haga, Tetsuya Takeuchi, Hisatomo Harima, Yoshichika Onukil, Yoshichika Onukil

    Journal of the Physical Society of Japan   74 ( 12 )   3320 - 3328   2005.12

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    We grew single crystals of PrCoIn5, PrRhIn5, and PrIrIn5 with the tetragonal crystal structure and measured the electrical resistivity, specific heat, magnetic susceptibility, magnetization and de Haas-van Alphen effect. These Pr compounds reveal no magnetic ordering. The topology of the Fermi surfaces is the same as that of a non-4f reference compound LaRhIn5. The cyclotron mass and/or the electronic specific heat coefficient are also approximately the same as those of LaRhIn5. The magnetic susceptibility and magnetization are anisotropic, reflecting the crystal structure, which are well explained by the tetragonal crystalline electric field scheme with the singlet ground state. ©2005 The Physical Society of Japan.

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  • In-115-NQR study of antiferromagnetism and superconductivity near magnetic criticality in CeIn3

    S Kawasaki, T Mito, Y Kawasaki, H Kotegawa, GQ Zheng, Y Kitaoka, H Shishido, S Araki, R Settai, Y Onuki

    PHYSICA B-CONDENSED MATTER   359   413 - 415   2005.4

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    We report the discovery of novel phases in CeIn3 on the verge of antiferromagnetism (AFM) through the In-nuclear quadrupole resonance (NQR) measurements. We have found that even though a pressure (P)-induced phase separation into AFM and paramagnetism (PM) takes place, a novel superconductivity (SC), which is induced without strong spin fluctuations, has been found to coexist with AFM on a microscopic level. We propose that the magnetic excitations such as spin-density fluctuations induced by the first-order magnetic phase transition might mediate attractive interaction to form Cooper pairs. (c) 2005 Elsevier B.V. All rights reserved.

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  • New superconducting and magnetic phases emerge on the magnetic criticality in CeIn3

    S Kawasaki, T Mito, Y Kawasaki, H Kotegawa, GQ Zheng, Y Kitaoka, H Shishido, S Araki, R Settai, Y Onuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 7 )   1647 - 1650   2004.7

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    We report the discovery of new superconducting and novel magnetic phases in CeIn3 on the verge of antiferromagnetism (AFM) under pressure (P) through the In-nuclear quadrupole resonance (NQR) measurements. We have found a P-induced phase separation of AFM and paramagnetism (PM) without any trace of a quantum phase transition in CeIn3. A new type of superconductivity (SC) was found, under P = 2.28-2.5 GPa, to coexist with AFM. It is magnetically separated from PM where the heavy fermion SC takes place. We propose that the magnetic excitations such as spin-density fluctuations induced by the first-order magnetic phase transition might mediate attractive interaction to form Cooper pairs.

    DOI: 10.1143/JPSJ.73.1647

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  • Strong uniaxial crystal field and ising like exchange interaction of ferromagnet CeAgSb2 Reviewed

    S. Araki, N. Metoki, A. Thamizhavel, Y. Onuki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   E399 - E400   2004.5

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    Neutron scattering experiments have been performed to reveal the magnetic excitation in ferromagnet CeAgSb2: Crystalline electric field excitations were observed at 5.2 and 12.5 meV in the paramagnetic state. Our analysis concluded that vertical bar +/- 1/2) is the ground state. The observed ferromagnetic moment is in good agreement with the ground-state saturation moment, gJ mu(B)J(2) similar to 0.43 mu(B): The spontaneous moment along the c-axis decreases with increasing the field perpendicular to the c-axis, and disappear at the critical field H-c, where the magnetization curve shows the kink behavior. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jmmm.2003.12.1258

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  • Higher-order collinear interaction and magnetic excitation in the 5f localized system U(3)Pd(20)Si(6) Reviewed

    Metoki N, Koike Y, Haga Y, Kaneko K, Araki S, McEwen KA, Kohgi M, Aso N, Lander GH, Komatsubara T, Kimura N, Aoki H, Onuki Y

    JOURNAL OF PHYSICS-CONDENSED MATTER   15 ( 28 )   S1957 - S1963   2003.7

  • Crystal Structure, magnetic ordering, and magnetic excitation in the 4f-localized ferromagnet CeAgSb2 Reviewed

    S Araki, N Metoki, A Galatanu, E Yamamoto, A Thamizhavel, Y Onuki

    PHYSICAL REVIEW B   68 ( 2 )   2003.7

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    Systematic neutron-scattering experiments have been carried out in order to reveal the crystal and magnetic structures as well as the magnetic excitation in the Ce-based intermetallic compound CeAgSb2. It was clarified that the Ag atoms in CeAgSb2 (space group: P4/nmm) occupy the 2b site, while Sb atoms occupy 2a and 2c sites, which have, to date, been controversial in literature. From the analysis of neutron powder-diffraction profile, we found the existence of the ferromagnetic component of about 0.41mu(B)/Ce oriented along the c axis, consistent with the result of previous studies. On the other hand, however, no trace of the antiferromagnetic or spin-density wave peak was detected within our range of experimental accuracy. We observed a considerable spin-wave excitation below 3 meV. The dispersion relation was explained by the anisotropic Heisenberg model. This means that CeAgSb2 has a simple ferromagnetic structure. Furthermore, crystalline electric-field (CEF) excitations were observed at 5.2 and 12.5 meV in the paramagnetic state, which is indicative of the localized nature of the Ce-4f electron. Our analysis revealed that vertical bar J(z) = +/-1/2&gt; is the ground state, while the first and second excited levels are mainly due to vertical bar +/-3/2&gt; and vertical bar +/-1/2&gt;, respectively. The observed ferromagnetic moment is in good agreement with the ground-state saturation moment, g(J)mu(B)J(z)similar to 0.43mu(B). The susceptibility, magnetization curve, and magnetostriction can be explained in terms of the CEF level scheme with anisotropic exchange interaction. (C) 2003 The American Physical Society

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  • De Haas-Van Alphen experiments under extreme conditions of low temperature, high field and high pressure, for high-quality cerium and uranium compounds Reviewed

    Settai R, Araki S, Shishido H, Inada Y, Haga Y, Yamamoto E, Kobayashi TC, Tateiwa N, Onuki Y

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   262 ( 3 )   399 - 406   2003.6

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    Conference proceedings, Hanoi International Symposium on Magnetism

    DOI: 10.1016/S0304-8853(03)00070-2

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  • De Haas-van Alphen effect of CeRhIn5 under pressure

    H Shishido, R Settai, S Araki, T Ueda, Y Inada, H Harima, Y Onuki

    PHYSICA B-CONDENSED MATTER   329   526 - 527   2003.5

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    We have studied the de Haas-van Alphen (dHvA) effect under pressure for an antiferromagnet CeRhIn5, where the antiferromagnetic state is changed into the superconducting state at higher pressures than 1.6 GPa. It is clarified from the present dHvA experiment that the topology of the Fermi surface is unchanged up to 2.1 GPa but the cyclotron mass increases strongly above 1.6 GPa. Superconductivity is found to be realized in this heavy fermion state. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(02)02366-9

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  • Unconventional superconductivity in CeIn3: In-115-NQR study under pressure Reviewed

    S Kawasaki, Y Kawasaki, T Mito, GQ Zheng, Y Kitaoka, S Araki, R Settai, Y Onuki

    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   388   541 - 542   2003.5

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    We report evidences for bulk nature and unconventional superconductivity in CeIn3 at P = 2.65 GPa revealed by the measurements of nuclear-spin-lattice-relaxation time (T-1) and ac-susceptibility (ac-chi). Both the measurements of ac-chi and T, have pointed to a superconducting transition at T = 95 mK, which is very much lower than an onset temperature T-onset = 0.15 K at zero resistance. The temperature dependence of 1/T-1 shows no coherence peak just below T-c, indicative of an unconventional nature for the superconductivity. (C) 2003 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4534(02)02732-6

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  • De Haas-van Alphen experiments in the quantum critical region of cerium and uranium compounds Reviewed

    Onuki Y, Settai R, Araki S, Nakashima M, Ohkuni H, Shishido H, Thamizhavel A, Inada Y, Haga Y, Yamamoto E, Kobayashi TC

    ACTA PHYSICA POLONICA B   34 ( 2 )   667 - 678   2003.2

  • Superconductivity in CeRh2Si2 under pressure

    S. Araki, M. Nakashima, R. Settai, T. C. Kobayashi, Y. Onuki

    Acta Physica Polonica B   2003

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  • De Haas-van Alphen Effect under Pressure in UGe2

    Rikio Settai, Yoshinori Haga, Miho Nakashima, Shugo Ikeda, Tomoyuki Okubo, Shingo Araki, Yoshichika Ōnuki

    Journal of Nuclear Science and Technology   39 ( sup3 )   94 - 97   2002.11

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    DOI: 10.1080/00223131.2002.10875416

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  • In-115-NQR evidence for unconventional superconductivity in CeIn3 under pressure Reviewed

    S Kawasaki, T Mito, Y Kawasaki, GQ Zheng, Y Kitaoka, H Shishido, S Araki, R Settai, Y Onuki

    PHYSICAL REVIEW B   66 ( 5 )   2002.8

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    We report evidence for unconventional superconductivity in CeIn3 at a pressure P=2.65 GPa above the critical pressure (P(c)similar to2.5 GPa) revealed by measurements of the nuclear-spin-lattice-relaxation time (T-1) and ac susceptibility (ac-chi). Both measurements of T-1 and ac-chi have pointed to a superconducting transition at T-c=95 mK, which is much lower than the onset temperature T-onset=0.15 K at zero resistance. The temperature dependence of 1/T-1 shows no coherence peak just below T-c, indicative of an unconventional nature for the superconductivity induced in CeIn3.

    DOI: 10.1103/PhysRevB.66.054521

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  • Fermi Surface, Magnetic and Superconducting Properties of LaRhIn5 and CeTIn5 (T: Co and Rh) Reviewed

    Shishido Hiroki, Settai Rikio, Aoki Dai, Ikeda Shugo, Araki Shingo, Nakashima Miho, Inada Yoshihiko, Haga Yoshinori, Harima Hisatomo, Aoki Yuji, Namiki Takahiro, Sato Hideyuki, Onuki Yoshichika

    Journal of the Physical Society of Japan   71   276 - 278   2002

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    We have studied Fermi surface properties of LaRhIn5 and CeTIn5 (T: Co, Rh and Ir) via the de Haas-van Alphen (dlivA) experiment. These Fermi surfaces are nearly cylindrhnal, reflecting the unique tetragonal crystal structure. The cyclotron mass or the gamma value is found to be strongly field-dependent in CeCoIn5. We have also carried out the dIlvA experiment under pressure for CeRhIn5.

    DOI: 10.1143/JPSJS.71S.276

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  • Pressure-induced superconductivity in an antiferromagnet CeRh2Si2

    S. Araki, M. Nakashima, R. Settai, T. C. Kobayashi, Y. Onuki

    J. Phys.: Condens. Matter   2002

  • Heavy fermions in cerium and uranium compounds studied by the de Haas-van Alphen experiment

    S. Araki, R. Settai, M. Nakashima, H. Shishido, S. Ikeda, H. Nakawaki, Y. Haga, N. Tateiwa, T. C. Kobayashi, H. Harima, H. Yamagami, Y. Aoki, T. Namiki, H. Sato, Y. Onuki

    J. Phys. & Chem. Solids   2002

  • Pressure-temperature phase diagram of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3: In-115-NQR study under pressure Reviewed

    S. Kawasaki, T. Mito, G. Q. Zheng, C. Thessieu, Y. Kawasaki, K. Ishida, Y. Kitaoka, T. Muramatsu, T. Kobayashic, D. Aoki, S. Araki, Y. Haga, R. Settai, Y.Onuki

    Physical Review B   65 ( 2 )   020504-1 - 4   2002

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    0312RevUO

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  • Evolution of pressure-induced heavy fermion state and superconductivity in CeRhIn5: A high-pressure Fermi surface study

    H. Shishido, R. Settai, S. Araki, T. Ueda, Y. Inada, T. C. Kobayashi, T. Muramatsu, Y. Haga, Y. Onuki

    Physical Review B   2002

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  • (formula presented)-NQR evidence for unconventional superconductivity in (formula presented) under pressure

    S. Kawasaki, T. Mito, Y. Kawasaki, G. Zheng, Y. Kitaoka, H. Shishido, S. Araki, R. Settai, Y. Ōnuki

    Physical Review B - Condensed Matter and Materials Physics   66 ( 5 )   1 - 4   2002

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    We report evidence for unconventional superconductivity in (formula presented) at a pressure (formula presented) above the critical pressure (formula presented) revealed by measurements of the nuclear-spin-lattice-relaxation time (formula presented) and ac susceptibility (ac- (formula presented) Both measurements of (formula presented) and ac- (formula presented) have pointed to a superconducting transition at (formula presented) which is much lower than the onset temperature (formula presented) at zero resistance. The temperature dependence of (formula presented) shows no coherence peak just below (formula presented) indicative of an unconventional nature for the superconductivity induced in (formula presented). © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevB.66.054521

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  • Pressure-temperature phase diagram of antiferromagnetism and superconductivity in (formula presented) and (formula presented) (formula presented) study under pressure

    S. Kawasaki, T. Mito, G. Zheng, C. Thessieu, Y. Kawasaki, K. Ishida, Y. Kitaoka, T. Muramatsu, T. C. Kobayashi, D. Aoki, S. Araki, Y. Haga, R. Settai, Y. Onuki

    Physical Review B - Condensed Matter and Materials Physics   65 ( 2 )   1 - 4   2002

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    We report the pressure (formula presented)-temperature (formula presented) phase diagram of antiferromagnetism and superconductivity in (formula presented) and (formula presented) revealed by the (formula presented) nuclear-spin-lattice-relaxation (formula presented) measurement. In the itinerant magnet (formula presented) we found that the Néel temperature (formula presented) is reduced at (formula presented) with an emergent pseudogap behavior. In (formula presented) the localized magnetic character is robust against the application of pressure up to (formula presented) beyond which the system evolves into an itinerant regime in which the resistive superconducting phase emerges. We discuss the relationship between the phase diagram and the magnetic fluctuations. © 2001 The American Physical Society.

    DOI: 10.1103/PhysRevB.65.020504

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  • Evolution of antiferromagntism and superconductivity in CeRhIn5 under pressure.

    S. Kawasaki, T. Mito, G.-q. Zheng, Y. Kawasaki, K. Ishida, Y. Kitaoka, D. Aoki, S. Araki, Y. Haga, R. Settai, Y. Onuki

    J. Phys. Soc. Jpn.   2002

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  • Pressure Effect on the Specific Heat of CeNi Single Crystal

    Shigeru Takayanagi, Shingo Araki, Rikio Settai, Yoshichika Onuki, Nobuo Mori

    J. Phys. Soc. Jpn.   70 ( 3 )   753 - 755   2001

  • Fermi surface instability in CeRh2Si2 under pressure

    S. Araki, R. Settai, T. C. Kobayashi, H. Harima, Y. Onuki

    Phys. Rev. B   2001

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  • High-quality single crystal growth and a change of the electronic states under pressure in CeRh2Si2

    S. Araki, R. Settai, T. C. Kobayashi, Y. Onuki

    J. Magn. Magn. Mat.   2001

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  • Magnetic and electrical properties in a dense Kondo compound PrSn3

    R Settai, K Sugiyama, A Yamaguchi, S Araki, K Miyake, T Takeuchi, K Kindo, Y Onuki, Z Kletowski

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   69 ( 12 )   3983 - 3995   2000.12

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    We measured the specific heat, thermal expansion coefficient; magnetization, electrical resistivity, magnetoresistance and de Haas-van Alphen (dHvA) effect in PrSn3. The dense Kondo effect was confirmed from a negative magnetoresistance and the presence of heavy electrons with the cyclotron effective mass of 8-9 m(0) for the main Fermi surface. The magnetic phase diagram was also clarified by the high-field magnetization measurement.

    DOI: 10.1143/JPSJ.69.3983

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  • AC susceptibility measurements on heavy fermion compounds CeCu6 and CeNi down to submillikelvin temperatures Reviewed

    H Tsujii, E Tanaka, T Mamiya, S Araki, R Settai, Y Onuki

    PHYSICA B   284   1265 - 1266   2000.7

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    We have measured the AC magnetic susceptibility of single crystals of the heavy fermion compounds CeCu6 and CeNi at temperatures down to 250 mu K. The susceptibility of CeCu6 shows a peak at about 2 mK in a zero magnetic field. The peak height along a-axis is about 10 times as large as along b- and c-axis, and decreases to zero in increasing field up to 11 mT. It is likely that the susceptibility of CeNi along c-axis has three peaks: below 350 mu K, at 47 mK and at 0.3 K, respectively. The two peaks at lower temperatures are suppressed by a magnetic field. The newly observed peaks in the susceptibilities for CeCu6 and CeNi suggest effects of magnetic impurities rather than of magnetic ordering. (C) 2000 Elsevier Science B.V. All rights reserved.

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  • Heavy electron mass and the Kondo effect in PrSn3

    A Yamaguchi, S Araki, K Miyake, K Sugiyama, R Settai, Y Onuki, Z Kletowski

    PHYSICA B   281   126 - 127   2000.6

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    We measured the electrical resistivity, magnetoresistance and de Haas-van Alphen effect in PrSn3. The Kondo effect was confirmed from a negative magnetoresistance and the presence of heavy electrons with the cyclotron effective mass m(c)* = 7.33-9.3 m(0). (C) 2000 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0921-4526(99)00813-3

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  • Metamagnetic transition of CeRh2Si2 under high fields and high pressures at various temperatures

    T Hamamoto, K Kindo, TC Kobayashi, Y Uwatoko, S Araki, R Settai, Y Onuki

    PHYSICA B   281   64 - 65   2000.6

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    High-field magnetization measurements in a heavy fermion antiferromagnet CeRh2Si2 were performed under high pressures at various temperatures to study the nature of the metamagnetism. Metamagnetic transitions were observed not only in the antiferromagnetic state but also in the paramagnetic stale at various pressures, The metamagnetism in CeRh2Si2 does not originate from the rearrangement of antiferromagnetic moments but from the recovery of the local moment from the Kondo singlet state by applying high magnetic fields. (C) 2000 Published by Elsevier Science B.V. All rights reserved.

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  • Pressure-dependence of superconducting behavior in CeRh2Si2 Reviewed

    T. C. Kobayashi, T. Muramatsu, M. Takimoto, K. Hanazono, K. Shimizu, K. Amaya, S. Araki, R. Settai, Y. Onuki

    Physica B   2000.4

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  • Orbital polarization effect on electronic structure and Fermi sureface in ferromagnetic UGa2

    H. Yamagami, T. Honma, E. Yamamoto, Y. Haga, S. Araki, D. Aoki, Y. Inada, R. Settai, Y. Onuki

    Physica B   2000

  • De Haas-van Alphen effect in CeNi under pressure

    S. Araki, R. Settai, Y. Inada, Y. Onuki

    Physica B   2000

  • Magnetic and Fermi surface properties of the ferromagnetic compound UGa2

    T.Honma, Y. Inada, R.Settai, S.Araki, Y.Tokiwa, T.Takeuchi, H.Sugawara, H.Sato, K.Kuwahara, M.Yokoyama, H.Amitsuka, T.Sakakibara, E.Yamamoto, Y.Haga, A.Nakamaura, H.Harima, H.Yamagami, Y.Onuki

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   2000

  • Anisotropic magnetoresistance in UBe13 Reviewed

    Y Haga, E Yamamoto, T Honma, A Nakamura, M Hedo, S Araki, H Ohkuni, Y Onuki

    PHYSICA B-CONDENSED MATTER   259-61   627 - 628   1999.1

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    Angular dependence of the transverse magnetoresistance of a heavy-fermion superconductor UBe13 (T-c = 0.9 K) was measured on a single crystal grown by the Al-flux method. The resistivity decreases with increasing the magnetic field at low temperatures, indicating that a magnetic scattering is suppressed by the magnetic field. We observed a remarkable angular dependence in magnetoresistance at 0.45 K under a constant held of 13 T, showing a minimum at the [1 1 0] direction. This anisotropy of magnetoresistance is observed below 4 K. Since the large resistivity (200 mu Ohm cm) of this compound at low temperatures is attributed to the magnetic scattering by uranium ions, the present anisotropy in the magnetic scattering at low temperatures would give important information about the ground state of 5f electrons. (C) 1999 Elsevier Science B.V. All rights reserved.

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  • de Haas-van Alphen Effect and RLAPW-Energy Band Calculations in CeNi

    S. Araki, R. Settai, Y. Inada, Y. Onuki, H. Yamagami

    Journal of the Physical Society of Japan   1999

  • Magnetic and transport properties of CeRh2Si2 under high pressures

    T. Muramatsu, S. Eda, T. C. Kobayashi, M. I. Eremets, K. Amaya, S. Araki, R. Settai, Y. Onuki

    Physica B   1999

  • Anisotropic ferroquadrupolar phase in magnetic fields for PrCu2 Reviewed

    R Settai, S Araki, P Ahmet, M Abliz, K Sugiyama, Y Onuki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   177   357 - 358   1998.1

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    We have studied the origin of the cooperative Jahn-Teller effect in PrCu2. We have determined the anisotropic phase diagram by measuring the thermal expansion and the magnetostriction in magnetic fields up to 15 T. The Jahn-Teller transition temperature is almost constant for the field along the a- and c-axis, while it decreases with increasing the field along the b-axis. The phase diagram can be explained qualitatively by including the quadrupolar interaction for [0(xy)] in the crystalline electric field Hamiltonian. (C) 1998 Elsevier Science B.V. All rights reserved.

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  • Thermal Expansion and de Haas-van Alphen Effect of CeRh2Si2

    Shingo Araki, Akira Misawa, Rikio Settai, Tetsuya Takeuchi, Yoshichika Onuki

    J.Phys.Soc.Jpn.   67 ( 8 )   2915 - 2918   1998

  • Metamagnetism in PrCu2 based on the quadrupole moment Reviewed

    R Settai, P Ahmet, S Araki, M Abliz, K Sugiyama, Y Onuki

    PHYSICA B   230   766 - 769   1997.2

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    We have studied the metamagnetism in PrCu2 via the magnetostriction. The metamagnetic transition accompanies a conversion between an easy and a hard axes in magnetization and also a huge magnetostriction. It is due to the magnetoelastic effect arising from the quadrupolar interaction, bringing about the rotation of the quadrupole moment.

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  • CeRh2Si2の反強磁性量子臨界点

    荒木新吾, 西森弘顕, 三井理功, 小林達生, 今井渉, 宮崎美里, 摂待力生, BRAITHWAITE Daniel, 青木大, 青木大, 酒井宏典

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   ROMBUNNO.17aS302‐8   2019.3

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  • CeRh2Si2の圧力下ホール効果

    荒木新吾, 三井理功, 小林達生, 今井渉, 宮崎美里, 摂待力生, BRAITHWAITE Daniel, 青木大, 青木大, 酒井宏典

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   ROMBUNNO.10pB202‐10   2018.9

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  • URhGe単結晶のNMRによる研究

    徳永陽, 青木大, 青木大, MAYAFFRE H, KRAEMER S, JULIEN M.‐H, BERTHIER C, HORVATIC M, 服部泰佑, 酒井宏典, 神戸振作, 荒木新吾, 荒木新吾

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   ROMBUNNO.17aL42‐4 - 1949   2017.3

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    &lt;p&gt;強磁性超伝導体URhGeの磁性と超伝導について、NMRによる研究を単結晶試料において行った結果について報告する。&lt;/p&gt;

    DOI: 10.11316/jpsgaiyo.72.1.0_1949

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  • CeRh2Si2の反強磁性量子臨界点

    荒木新吾, 三井理功, 恩地太紀, 北川俊作, 小林達生, 今井渉, 宮崎美里, 摂待力生, 酒井宏典

    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   ROMBUNNO.14pJD‐12 - 2009   2016.9

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    &lt;p&gt;反強磁性CeRh2Si2のネール温度は約1GPaで消失する。その臨界圧力近傍ではフェルミ面の不連続変化,圧力誘起超伝導の存在が確認されている。本研究では,圧力下の精密なホール効果と電気抵抗測定をを行い,臨界圧力近傍の相図を明らかにし,超伝導の引力起源となる揺らぎの探索を行う。&lt;/p&gt;

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  • Phase transitions observed due to the improvement of hydrostaticity

    Tatsuo Kobayashi, Shingo Araki

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   26 ( 1 )   21 - 26   2016.3

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    In this article, the characteristics of the indenter-type high-pressure cell which was developed in our laboratory and the physical properties of Daphne oil 7474 were described. Some phase transitions which can be observed due to the improvement of hydrostaticity were reviewed. In these systems, the lack of hydrostaticity often caused the broadening and the disappearance of the phase transition.

    DOI: 10.4131/jshpreview.26.21

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  • URhGeのNMRによる研究

    徳永陽, 青木大, 青木大, MAYAFFRE H, KRAEMER S, JULIEN M.‐H, BERTHIER C, HORVATIC M, 服部泰佑, 酒井宏典, 神戸振作, 荒木新吾, 荒木新吾

    日本物理学会講演概要集(CD-ROM)   71 ( 1 )   ROMBUNNO.22APS‐41   2016.3

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  • Pressure-temperature phase diagram in Cd2Re2O7

    Kobayashi T. C., Abe D., Araki S., Yamaura J., Matsubayashi Y., Hiroi Z.

    Meeting Abstracts of the Physical Society of Japan   71   1977 - 1977   2016

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    DOI: 10.11316/jpsgaiyo.71.2.0_1977

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  • 22aPS-41 NMR study on U(Rh_<1-x>Co_x)Ge III

    Tokunaga Y, Kambe S, Araki S, Aoki D, Mayaffre H, Kraemer S, Julien M. -H, Berthier C, Horvatic M, Hattori T, Sakai H

    Meeting Abstracts of the Physical Society of Japan   71 ( 0 )   2016

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  • U(Rh1-xCox)GeのNMRによる研究 III

    徳永陽, 青木大, 青木大, MAYAFFRE H, KRAEMER S, JULIEN M.‐H, BERTHIER C, HORVATIC M, 服部泰佑, 酒井宏典, 神戸振作, 荒木新吾, 荒木新吾

    日本物理学会講演概要集(CD-ROM)   70 ( 2 )   ROMBUNNO.16ADA-11   2015.9

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  • CeRh2Si2の高圧ホール効果

    荒木新吾, 恩地太紀, 北川俊作, 小林達生, 宮崎美里, 摂待力生, 酒井宏典

    日本物理学会講演概要集(CD-ROM)   70 ( 2 )   ROMBUNNO.17APS-18   2015.9

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  • 22aBA-11 P-T phase diagram in the iron-based superconductor Ca_<10>(Ir_4As_8)(Fe_<2-x>Ir_xAs_2)_5

    Kitagawa S., Araki S., Kobayashi T. C., Ishii H., Fujimura K., Mitsuoka D., Kudo K., Nohara M.

    Meeting Abstracts of the Physical Society of Japan   70   2065 - 2065   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_2065

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  • 16aDA-11 NMR study on U(Rh_<1-x>Co_x)Ge III

    Tokunaga Y, Kambe S, Araki S, Aoki D, Mayaffre H, Kraemer S, Julien M. -H, Berthier C, Horvatic M, Hattori T, Sakai H

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   2015

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  • 23pBC-11 Pressure effect in the ferromagnet CeTiGe_3

    Kawashima G., Kitagawa S., Araki S., Kobayashi T. C., Inamdar M., Thamizhavel A., Dhar S. K.

    Meeting Abstracts of the Physical Society of Japan   70   2296 - 2296   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_2296

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  • 21pBE-13 Disappearance of Metal-Insulator transition under high pressure in natural mineral Cu_<12>Sb_4S_<13>

    Sekiya T., Kitagawa S., Araki S., Kobayashi T. C., Kimura T., Nishimoto N., Kudo K., Nohara M., Kambe T.

    Meeting Abstracts of the Physical Society of Japan   70   2053 - 2053   2015

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    DOI: 10.11316/jpsgaiyo.70.1.0_2053

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  • 8aPS-49 Pressure-magnetic field phase diagram of heavy fermion antiferromagnet CeNiGe_3

    Kitagawa S., Fujiwara Y., Kawashima G., Ikeda Y., Araki S., Kobayashi T. C.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   368 - 368   2014.8

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  • 7pBK-9 Two-fluid model analysis of Hall effect in CeIn_3 under high pressure

    Onji T., Araki S., Kobayashi T. C.

    Meeting abstracts of the Physical Society of Japan   69 ( 2 )   345 - 345   2014.8

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  • 30aBE-7 Hall effect in single-crystal CeCu_2Si_2 under high pressure

    Kobayashi T. C., Araki S., Nishiumi N., Onji T., Ikeda Y., Seiro S., Geibel C., Steglich F.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   663 - 663   2014.3

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  • 28aPS-79 Charge Density Wave in EuAl_4

    Araki S., Ikeda Y., Kobayashi T. C., Nakamura A., Hiranaka Y., Hedo M., Nakama T., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   611 - 611   2014.3

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  • 28aPS-29 Pressure-Induced Magnetic Transition and Disappearance of Superconductivity in CeNiGe_3

    Tomijima Takeshi, Ikeda Yoichi, Araki Shingo, Kobayashi Tatsuo C.

    Meeting abstracts of the Physical Society of Japan   69 ( 1 )   600 - 600   2014.3

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  • 27pCE-4 Pressure Dependence of (NH_3)_yFeSe_<1-x>Te_x Prepared Using Liquid NH3 Technique Reviewed

    Izumi M., Fujiwara Akihiko, Kim Jungeun, Sun Liling, Kubozono Y., Sakai Y., Zheng Lu, Goto H., Eguchi R., Sakata M., Kobayashi T. C., Araki S., Onji T.

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   561 - 561   2014

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    DOI: 10.11316/jpsgaiyo.69.1.3.0_561_4

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  • 7pBD-9 Emergence of High-T_c Superconducting Phase in (NH_3)_yCs_<0.4>FeSe under high pressure

    Izumi M, Araki S, Kobayashi T. C, Prassides Kosmas, Sun Liling, Kubozono Y, Sakata M, Sakai Y, Zheng Lu, Goto H, Nakamoto Y, Kagayama T, Shimizu K, Onji T

    Meeting Abstracts of the Physical Society of Japan   69 ( 0 )   2014

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  • アンモニア溶媒を用いて金属ドーピングされたFeSe1-xTexの超伝導の圧力依存性

    和泉正成, 酒井優介, ZHENG Lu, 後藤秀徳, 江口律子, 坂田雅文, 小林達生, 荒木新吾, 恩地太紀, 藤原明比古, KIM Jungeun, SUN Liling, 久保園芳博

    日本物理学会講演概要集   69 ( 1 )   2014

  • Hall effect in single-crystal CeCu_2Si_2 under high pressure

    Araki S., Nishiumi N., Onji T., Ikeda Y., Kobayashi C.T., Seiro S., Geibel C., Steglich F.

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   592 - 592   2013.8

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  • 29aXB-3 NQR Study of CeCu_2Si_2 under High Pressure

    Iwata M., Fujiwara K., Miyoshi K., Ikeda Y., Araki S., Kobayashi T. C., Geibel C., Steglich F.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   685 - 685   2013.3

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  • 29aXB-2 Cu-Ni Substitution Effects on High-Pressure Resistive Anomalies of CeCu_2Si_2

    Ito Y., Ikeda Y., Araki S., Kobayashi T. C.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   685 - 685   2013.3

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  • 27aPS-16 Hall Effect under Pressurein Pressure Induce Superconductor CeIrSi_3 without Centrosymmetric

    Nishiumi N., Araki S., Ikeda Y., Kobayasi T., Miura Y., Settai R., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   613 - 613   2013.3

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  • 29pXB-5 Metamagnetic Transition under pressure in U_3P_4

    Araki S., Hayashida M., Nishiumi N., Manabe H., Ikeda Y., Kobayashi T. C., Murata K., Wisniewski P., Inada Y., Aoki D., Onuki Y., Yamamoto E., Haga Y.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   719 - 719   2013.3

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  • 29aXB-6 Coexistence and Competition of Magnetism and Superconductivity on CeNiGe_3.

    Tomijima Takeshi, Ikeda Yoichi, Araki Shingo, Kobayashi Tatsuo C.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   686 - 686   2013.3

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  • 27aPS-33 Synthesis and Physical Properties of a New Ce-based Ferromagnet CePd_2P_2

    Konishi Sunao, Ikeda Yoichi, Araki Shingo, Kobayashi Tatsuo C.

    Meeting abstracts of the Physical Society of Japan   68 ( 1 )   617 - 617   2013.3

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  • Pressure dependence of (NH_3)_yM_xFeSe_<1-x>Te_x(x=0.2,0.5,0.7) prepared using liquid NH_3 technique Reviewed

    Izumi M., Sun Liling, Kubozono Y., Sakai Y., Lu Zheng, Goto H., Eguchi R., Sakata M., Kobayashi C.T., Araki S., Onji T.

    Meeting Abstracts of the Physical Society of Japan   68 ( 0 )   587 - 587   2013

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    DOI: 10.11316/jpsgaiyo.68.2.3.0_587_2

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  • アンモニア溶媒を用いて金属ドーピングされたFeSe1-xTex超伝導体の圧力依存性

    和泉正成, 酒井優介, LU Zheng, 後藤秀徳, 江口律子, 坂田雅文, 小林達生, 荒木新吾, 恩地太紀, SUN Liling, 久保園芳博

    日本物理学会講演概要集   68 ( 2 )   2013

  • Pressure Loading of Alkali Metal into Nanopore of Zeolite Crystals and Exotic Magnetism

    NAKANO T., NAM Nguyen Hoang, ARAKI S., KAGAYAMA T., NOZUE Y.

    7 ( 5 )   223 - 229   2012.10

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  • 19aFF-9 Nuclear Magnetic Relaxation of CeCu_2Si_2 in a Critical Pressure Region

    Iwata M., Fujiwara K., Miyoshi K., Ikeda Y., Araki S., Kobayashi T. C., Geibel C., Steglich F.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   472 - 472   2012.8

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  • 19aFF-10 Anomalous Fermi Liquid Behavior in the Ni Substituted CeCu_2Si_2

    Ikeda Yoichi, Ito Yuzo, Araki Shingo, Kobayashi Tatsuo C.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   473 - 473   2012.8

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  • 19aFF-12 Hall effect in single-crystal CeCu_2Si_2 under high pressure

    Araki S., Nishiumi N., Hayashida M., Shinohara T., Ito Y., Ikeda Y., Kobayashi T. C., Seiro S., Geibel C., Steglich F.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   473 - 473   2012.8

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  • 19aFF-4 Single Crystal Growth and Electrical Resistivity Measurements under High Pressure of CeNiGe_3

    Tomijima Takeshi, Ikeda Yoichi, Araki Shingo, Kobayashi Tatsuo C.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   471 - 471   2012.8

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  • 19aFF-11 Electrical Resistivity of Heavy Fermion Superconductor Ce(Cu_<1-x>Ni_x)_2Si_2 under High Pressure

    Ito Yuzo, Ikeda Yoichi, Araki Shingo, Kobayashi Tatsuo C.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   473 - 473   2012.8

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  • 21pFH-4 Hall effect under high pressure in U_3P_4

    Hayashida M., Araki S., Nishiumi N., Manabe H., Ikeda Y., Kobayashi T. C., Murata K., Wisniewski P., Aoki D., Onuki Y., Yamamoto E., Haga Y.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   604 - 604   2012.8

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  • 20aPSA-21 Cu-NMR Study of Single Crystal CeCu_2Si_2 under pressure

    Shirai T., Fujiwara K., Miyoshi K., Ikeda Y., Araki S., Kobayashi T. C., Seiro S., Geibel C., Steglich F.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   511 - 511   2012.8

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  • 21pFE-2 Pressure Effects on Rattling and Superconductivity of the Einstein Solids A_xV_2Al_<20>(A=Ga_<0.2>,Al_<0.3>)

    Shinohara T., Kawasaki Y., Ikeda Y., Araki S., Kobayashi T. C., Onosaka A., Okamoto Y., Hiroi Z.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   601 - 601   2012.8

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  • 24pPSB-42 Electrical Resistivity of Ce(Cu_<1-x>Ni_x)_2Si_2 under High Pressure

    Ito Y., Ikeda Y., Araki S., Kobayashi T.C.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   573 - 573   2012.3

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  • 25aYB-9 Hall effect in single-crystal CeCu_2Si_2 under high pressure

    Araki S., Nishiumi N., Hayashida M., Shinohara T., Shiroyama Y., Ikeda Y., Kobayashi T.C., Seiro S., Geibel C., Steglich F.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   587 - 587   2012.3

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  • 25aYB-8 Similar Effects between the Ni-Substitution and the Application of Hydrostatic Pressure on the Heavy-Fermion Superconductor CeCu_2Si_2

    Ikeda Y., Ito Y., Araki S., Kobayashi T. C.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   587 - 587   2012.3

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  • 25pPSB-44 Correlations between Einstein Temperatures and Superconducting Transition Temperatures on the Einstein Solids A_xV_2Al_<20> (A=Ga, Al, Y)

    Kawasaki Y., Shinohara T., Ikeda Y., Araki S., Kobayashi T. C., Onosaka A., Okamoto Y., Hiroi Z.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   655 - 655   2012.3

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  • 24pPSB-28 Hall Effect under High Pressure in U_3P_4

    Hayashida M., Araki S., Manabe H., Kobayashi T.C., Inada Y., Murata K., Wisniewski P., Aoki D., Onuki Y., Yamamoto E., Haga Y., Fujiwara K.

    Meeting abstracts of the Physical Society of Japan   67 ( 1 )   570 - 570   2012.3

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  • Pressure loading of alkali-metal into nanopore of zeolite crystals and electronic states of nanoclusters Reviewed

    Takehito Nakano, Shingo Araki, Tomoko Kagayama, Yasuo Nozue

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   22 ( 1 )   44 - 50   2012

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    In this article, we have developed pressure loading technique to extend the loading density of guest alkali metals in nanoporous crystals of zeolites. Zeolite crystals have solid framework and open regular nanospace. In the nanocages of zeolite crystals, s-electrons provided by the guest alkali metals occupy quantum electronic states of clusters successively. Under the pressure by the use of the pressure medium of alkali metals, we have observed significant change in the magnetic properties, indicating that the pressure loading increases loading densities which are closely related to the s-electron occupation at the quantum states of clusters.

    DOI: 10.4131/jshpreview.22.44

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  • 21aPS-56 Hall effect under pressure on CeCu_2Si_2

    Shiroyama Y., Araki S., Kobayashi T. C., Seiro S., Geibel C., Steglich F.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   614 - 614   2010.3

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  • 21aPS-37 Heat capacity measurement in SmOs_4Sb_<12> under high pressure

    Miyazawa K., Araki S., Kobayashi T. C., Kotegawa H., Sugawara H., Kikuchi D., Sato H.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   610 - 610   2010.3

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  • 21pGF-14 Pressure induced ferromagnetic-nonmagnetic transition on U_3P_4

    Araki S., Manabe H., Kobayashi T. C., Inada Y., Murata K., Wisniewski P., Aoki D., Onuki Y., Yamamoto E., Haga Y., Fujiwara K.

    Meeting abstracts of the Physical Society of Japan   65 ( 1 )   633 - 633   2010.3

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  • 28aYG-6 Electrical conductivity of potassium-loaded zeolite LSX (II)

    Araki Shingo, Owaki Akihiro, Nam Nguyen Hoang, Nozue Yasuo

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   826 - 826   2009.3

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  • 28aYG-7 Electrical conductivity of alkali metal loaded zeolite A

    Nam Nguyen Hoang, Kubo Y., Owaki A., Duan Truong Cong, Araki S., Nozue Y.

    Meeting abstracts of the Physical Society of Japan   64 ( 1 )   826 - 826   2009.3

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  • 26aTF-7 Electrical Conductivity Measurement of alkali-metal loaded zeolite

    Araki Shingo, Inoue Kaoru, Owaki Akihiro, Nam Nguyen Hoang, Nozue Yasuo

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   839 - 839   2008.2

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  • 26aTF-8 Electrical conductivity of potassium loaded zeolite LSX

    Owaki A., Inoue K., Nam Nguyen Hoang, Araki S., Nozue Y.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   840 - 840   2008.2

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  • 26aTF-13 New Ferromagnetism of Potassium Clusters in Pressure-Doped Low-Silica X Zeolite (III)

    Nam N. H, Ohtsu T., Araki S., Nozue Y.

    Meeting abstracts of the Physical Society of Japan   63 ( 1 )   841 - 841   2008.2

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  • 24pRB-2 New Ferromagnetism of Potassium Clusters in Pressure-Doped Low-Silica X Zeolite (II)

    Nam N.H., Ohtsu T., Araki S., Nozue Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   901 - 901   2007.8

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  • 24pRB-1 Magnetism of pressure doped Na-K clusters in zeolite LSX

    Araki Shingo, Nam Nguyen Hoang, Ohtsu Tatsuya, Nozue Yasuo

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   901 - 901   2007.8

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  • 21pRG-3 New Ferromagnetism of Potassium Clusters in Pressure-Doped Low Silica X Zeolite

    Nam N. H., Ohtsu T., Araki S., Nozue Y.

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   866 - 866   2007.2

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  • 21pRG-4 Pressure doping of Rb and K clusters in zeolite LTA and their maenetism

    Araki Shingo, Nam Nguyen Hoang, Kawasaki Satoshi, Ito Sachie, Nozue Yasuo

    Meeting abstracts of the Physical Society of Japan   62 ( 1 )   866 - 866   2007.2

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  • 30aRC-9 Pressure Doping Effects of Potassium Cluster in Zeolite LTA (V)

    Nam Nguyer Hoang, Kawasaki S., Shiraga H., Araki S., Nozue Y.

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   850 - 850   2006.3

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  • 27aUF-6 Metamagnetic transition in RRhIn_5 compounds (R: Nd, Tb, Dy and Ho)

    Hieu Nguyen Van, Shishido Hiroaki, Nakashima Hiroshi, Sugiyama Kiyohiro, Settai Rikio, Araki Shingo, Nozue Yasuo, Matsuda Tatsuma D., Haga Yoshinori, Takeuchi Tetsuya, Jonen Shintaro, Metoki Naoto, Hagiwara Masayuki, Kindo Koichi, Onuki Yoshichika

    Meeting abstracts of the Physical Society of Japan   61 ( 1 )   518 - 518   2006.3

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  • de Haas-van Alphen effect in CeRhIn5 and Ce2RhIn8 under the pressure

    Shishido H, Araki S, Galatanu A, Matsuda T.D, Yamamoto E, Nakashima M, Ueda T, Ikeda S, Hashimoto S, Inata Y, Settai R, Onuki Y

    Meeting abstracts of the Physical Society of Japan   57 ( 2 )   2002.8

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  • 24aPS-6 Pressure induced superconductivity in CeRh_2Si_2

    Araki S., Nakawaki H., Asai R., Settai R., Kobayashi T. C., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   474 - 474   2002.3

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  • 24pwA-2 de Haas-van Alphen effect in CeRhIn5 under the pressure

    Shishido H., Araki S., Nakashima M., Ueda T., Inata Y., Settai R., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   493 - 493   2002.3

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  • 27aWB-4 Physical Properties in CeMg_2Cu_g under Pressure

    Asai R., Nakawaki H., Nakashima M., Araki S., Ikeda S., Sawai Y., Kirita S., Yamada M., Fujiwara T., Kobayashi T. C., Inada Y., Settai R., Onuki Y.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   579 - 579   2002.3

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    Language:Japanese   Publisher:The Physical Society of Japan (JPS)  

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Presentations

  • 強磁性超伝導体UCoGeの高圧下ホール効果

    日本物理学会第72回年次大会  2017 

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  • CeRh2Si2の反強磁性量子臨界点

    日本物理学会2016年秋季大会  2016 

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  • CeRh2Si2の高圧ホール効果

    日本物理学会 2015年 秋季大会  2015 

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  • Hall effect under pressure in CeCu2Si2

    SCES 2014  2014 

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  • EuAl4の電荷密度波(CDW)

    日本物理学会大69回年次大会  2014 

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  • 単結晶CeCu2Si2の高圧下Hall効果

    日本物理学会第69回年次大会  2014 

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  • CeCu2Si2の高圧下ホール効果

    日本物理学会 2013年 秋季大会  2013 

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  • Metamagnetic transition of itinerant ferromagnet U3P4 under high pressure

    SCES 2013  2013 

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  • ゼオライト中のアルカリ金属クラスターの研究における新展開

    大阪大学G-COE若手秋の学校「新しい量子物質・物性・機能の研究」  2009 

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  • カリウムを吸蔵したゼオライトLSXの電気伝導度特性

    特定領域研究「配列ナノ空間を利用した新物質科学 ユビキタス元素戦略」第3回領域会議  2009 

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  • カリウムを吸蔵したゼオライトLSXの電気伝導特性(II)

    日本物理学会第64回年次大会  2009 

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  • Electrical Resistivity of Zeolite LSX Loaded with Potassium Metal

    15th International Symposium on Intercalation Compounds  2009 

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  • 圧力ドーピング法により創成されるゼオライト中アルカリ金属クラスターの磁性

    大阪大学21世紀COEワークショップ「超高圧を利用した新物質創成」  2008 

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  • アルカリ金属を吸蔵したゼオライト試料の電気伝導度測定法の開発

    日本物理学会 第63回年次大会  2008 

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  • 圧力ドーピング法により作成したゼオライトLSX中のKクラスターの磁性

    特定領域研究「配列ナノ空間を利用した新物質科学 ユビキタス元素戦略」第2回領域会議  2008 

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  • 圧力ドーピング法で作成されるゼオライト中のアルカリ金属クラスターの磁性

    特定領域研究(配列ナノ空間を利用した新物質科学-ユビキタス元素戦略-)若手研究会(第1回)夏の学校  2008 

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  • 圧力ドーピング法によるゼオライトLSX中のNa-Kクラスターの磁性

    日本物理学会 2008年秋季大会  2008 

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  • 圧力ドーピング法によって作成したゼオライト中のアルカリ金属クラスターの磁気秩序

    平成20年度 大阪大学G-COE若手秋の学校「多元環境下の量子物質相の研究」  2008 

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  • 圧力ドーピングにより作成されるゼオライト中のアルカリ金属クラスターの磁気秩序

    第1回凝縮系領域横断研究会「スピンが拓く物性科学の最前線」  2008 

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  • 圧力ドーピング法によるゼオライト中の新奇アルカリ金属クラスター探索

    特定領域研究「配列ナノ空間を利用した新物質科学:ユビキタス元素戦略」平成19年度キックオフミーティング  2007 

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  • ゼオライトLSX中にK圧力ドーピングされたNa-Kクラスターの磁性

    日本物理学会 第62回年次大会  2007 

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  • 圧力ドーピング法により作成したゼオライト中のカリウムクラスターの磁性

    大阪大学21世紀COEプログラム「究極と統合の新しい基礎科学」 若手秋の学校「遍性と多様性の共存する21世紀の新しい基礎科学の芽」  2007 

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  • 圧力ドーピング法によるLSX中のカリウムクラスターの新しい強磁性

    第23回ゼオライト研究発表会  2007 

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  • ゼオライトLTA中の Rb, K クラスターの圧力ドーピングと磁性

    日本物理学会 2007年春季大会  2007 

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  • Magnetism of Alkali Metal Clusters in Pressure-Doped Zeolites

    International Workshop 2007, The 21st Century COE Program "Towards a New Basic Science: Depth and Synthesis"  2007 

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  • ゼオライトへのカリウム圧力ドーピング過程の考察

    日本物理学会 第61回年次大会  2006 

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  • MAGNETIC PROPERTIES OF TRANSITION METAL CLUSTERS IN ZEOLITE X

    ICM2006  2006 

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Awards

  • 第12回日本物理学会論文賞

    2007  

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    Country:Japan

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  • Low Temperature Magnetism (2021academic year) Prophase  - その他

  • Solid State Physics 3 (2021academic year) 3rd and 4th semester  - 木3,木4

  • Solid State Physics 3A (2021academic year) Third semester  - 木3,木4

  • Solid State Physics 3B (2021academic year) Fourth semester  - 木3,木4

  • Solid State Physics 5 (2021academic year) Third semester  - 木3,木4

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  • Physics for General Education (Electromagnetism) 1 (2021academic year) 1st semester  - 火1~2

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  • Physics of Materials under Extreme Conditions (2021academic year) Late  - 金3,金4

  • Seminar in Materials Physics in Extreme Environments (2021academic year) Year-round  - その他

  • Low Temperature Magnetism (2020academic year) Prophase  - その他

  • Solid State Physics 3 (2020academic year) 3rd and 4th semester  - 木3,木4

  • Solid State Physics 5 (2020academic year) Third semester  - 木3,木4

  • Solid State Physics 6 (2020academic year) Fourth semester  - 木3,木4

  • Physics for General Education (Electromagnetism) 1 (2020academic year) 1st semester  - 火1,火2

  • Physics for General Education (Electromagnetism) 2 (2020academic year) Second semester  - 火1,火2

  • Physics of Materials under Extreme Conditions (2020academic year) Late  - 金2,金3

  • Seminar in Materials Physics in Extreme Environments (2020academic year) Year-round  - その他

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