2021/04/08 更新

写真a

アラキ シンゴ
荒木 新吾
ARAKI Shingo
所属
自然科学学域 准教授
職名
准教授
外部リンク

学位

  • 博士(理学) ( 大阪大学 )

研究キーワード

  • Strongly Correlated Electron System

  • 強相関物理学

研究分野

  • 自然科学一般 / 磁性、超伝導、強相関系

学歴

  • 大阪大学    

    - 2001年

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    国名: 日本国

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  • 大阪大学   Graduate School, Division of Natural Science   Department of Physics

    - 2001年

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  • 大阪大学   理学部   物理学科

    - 1996年

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    国名: 日本国

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  • 大阪大学   Faculty of Science   Department of Physics

    - 1996年

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経歴

  • - 岡山大学自然科学研究科 准教授

    2009年

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

    2009年

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  • Assistant Professor,Osaka University

    2007年 - 2009年

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  • 大阪大学

    2007年 - 2009年

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  • 大阪大学

    2003年 - 2007年

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  • Research Associate,Osaka University

    2003年 - 2007年

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  • Researcher,Japan Atomic Energy Research Institute

    2002年 - 2003年

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  • 日本原子力研究所 研究員

    2002年 - 2003年

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  • 大阪大学 日本学術振興会特別研究員

    2001年 - 2002年

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

    2001年 - 2002年

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▼全件表示

所属学協会

 

MISC

  • 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 Matter536   122 - 124   2018年5月

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    記述言語:英語   出版者・発行元:Elsevier B.V.  

    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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  • 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 Matter536   122 - 124   2018年5月

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    記述言語:英語   出版者・発行元:Elsevier B.V.  

    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 JAPAN86 ( 11 ) 1191 - 1196   2017年11月

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    記述言語:英語   出版者・発行元:PHYSICAL SOC JAPAN  

    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 B93 ( 20 )   2016年5月

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    記述言語:英語   出版者・発行元:AMER PHYSICAL SOC  

    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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  • 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 B93 ( 20 ) 201112   2016年5月

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    記述言語:英語   出版者・発行元:AMER PHYSICAL SOC  

    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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  • 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 B93 ( 20 ) 201112   2016年5月

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    記述言語:英語   出版者・発行元:AMER PHYSICAL SOC  

    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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  • Phase transitions observed due to the improvement of hydrostaticity

    Tatsuo Kobayashi, Shingo Araki

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu26 ( 1 ) 21 - 26   2016年3月

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    記述言語:英語   掲載種別:書評論文,書評,文献紹介等   出版者・発行元:Japan Society of High Pressure Science and Technology  

    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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  • 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 COMPOUNDS654   290 - 299   2016年1月

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    記述言語:英語   出版者・発行元: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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  • 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 COMPOUNDS654   290 - 299   2016年1月

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    記述言語:英語   出版者・発行元: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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  • 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 COMPOUNDS654   290 - 299   2016年1月

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    記述言語:英語   出版者・発行元: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 STRUCTURE683 ( 1 )   2016年

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    記述言語:英語   出版者・発行元: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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  • Hall Effect in CeIn3 under High Pressure

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN84 ( 12 ) 123702   2015年12月

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    記述言語:英語   出版者・発行元:PHYSICAL SOC JAPAN  

    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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  • Hall Effect in CeIn3 under High Pressure

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

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN84 ( 12 ) 123702   2015年12月

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    記述言語:英語   出版者・発行元:PHYSICAL SOC JAPAN  

    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 JAPAN84 ( 9 ) 093701-1-093701-4   2015年9月

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    記述言語:英語   出版者・発行元:PHYSICAL SOC JAPAN  

    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 LETTERS114 ( 21 ) 216401-1-216401-5   2015年5月

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    記述言語:英語   出版者・発行元:AMER PHYSICAL SOC  

    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 REPORTS5   9477-1-9477-7   2015年4月

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    記述言語:英語   出版者・発行元:NATURE PUBLISHING GROUP  

    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 Wiśniewski, Dai Aoki, Yoshichika Onuki, Etsuji Yamamoto, Yoshinori Haga

    Journal of the Physical Society of Japan84 ( 2 ) 024705-1-024705-8   2015年2月

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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年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    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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  • Simultaneous suppression of superconductivity and structural phase transition under pressure in Ca10(Ir4As8)(Fe2−xIrxAs2)5

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

    Physical Review B90 ( 22 ) 224513-1-224513-5   2014年12月

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  • Superconducting phases in (NH3)yMxFeSe1-zTez (M = Li, Na, and Ca)

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

    Physical Review B89 ( 14 ) 144509-1-144509-6   2014年4月

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  • 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 JAPAN83 ( 1 ) 015001-1-015001-2   2014年1月

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    記述言語:英語   出版者・発行元:PHYSICAL SOC JAPAN  

    DOI: 10.7566/JPSJ.83.015001

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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 Proceedings3   011081-1-011081-6   2014年

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

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

    JPS Conference Proceedings3   015044-1-015044-6   2014年

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  • 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 Physics88 ( 9 ) 094521-1-094521-5   2013年9月

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    記述言語:英語  

    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.

    DOI: 10.1103/PhysRevB.88.094521

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

    Yoichi Ikeda, Shingo Araki, Tatsuo C. Kobayashi

    Journal of the Korean Physical Society63 ( 3 ) 766 - 767   2013年8月

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    記述言語:英語  

    DOI: 10.3938/jkps.63.766

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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 SOCIETY63 ( 3 ) 512 - 516   2013年8月

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    記述言語:英語   出版者・発行元:KOREAN PHYSICAL SOC  

    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 < 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 > 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.

    DOI: 10.3938/jkps.63.512

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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 Society63 ( 3 ) 699 - 705   2013年8月

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    記述言語:英語  

    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.

    DOI: 10.3938/jkps.63.699

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  • 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

    Journal of Physical Society of Japan81 ( 8 ) 083701-1-083701-4   2012年6月

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  • Iron–platinum–arsenide superconductors Ca<SUB>10</SUB>(Pt<SUB>n</SUB>As<SUB>8</SUB>)(Fe<SUB>2-x</SUB>Pt<SUB>x</SUB>As<SUB>2</SUB>)<SUB>5</SUB>

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

    Solid State Communications152 ( 8 ) 635 - 639   2012年4月

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  • Hall effect in single crystal CeCu2Si2 under high pressure

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

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011)391   012005   2012年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    Hall effect measurements were carried out under high pressures up to 4.9 GPa in a single crystal of CeCu2Si2. The temperature dependence of the Hall coefficient is interpreted to be composed of two peaks below room temperature. The high-temperature peak shows strong pressure dependence, where the peak shifts from 20 K at ambient pressure to 125 K at 4.9 GPa. This peak is a consequence of the anomalous Hall effect due to skew scattering. The low-temperature peak shifts from 5 K at ambient pressure to 15 K at 4.9 GPa and the magnitude of the peak shows the maximum around 4.1 GPa at which the superconducting transition temperature also reaches the maximum.

    DOI: 10.1088/1742-6596/391/1/012005

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  • Hall effect in single crystal CeCu2Si2 under high pressure

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

    INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011)391   012005   2012年

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    Hall effect measurements were carried out under high pressures up to 4.9 GPa in a single crystal of CeCu2Si2. The temperature dependence of the Hall coefficient is interpreted to be composed of two peaks below room temperature. The high-temperature peak shows strong pressure dependence, where the peak shifts from 20 K at ambient pressure to 125 K at 4.9 GPa. This peak is a consequence of the anomalous Hall effect due to skew scattering. The low-temperature peak shifts from 5 K at ambient pressure to 15 K at 4.9 GPa and the magnitude of the peak shows the maximum around 4.1 GPa at which the superconducting transition temperature also reaches the maximum.

    DOI: 10.1088/1742-6596/391/1/012005

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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 B84 ( 5 ) 054524-1-054524-5   2011年8月

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    記述言語:英語   出版者・発行元:AMER PHYSICAL SOC  

    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.

    DOI: 10.1103/PhysRevB.84.054524

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  • Heat Capacity and ac-Susceptibility Measurements of SmOs₄Sb<SUB>12</SUB> 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 Society80   SA034-1-SA034-3   2011年

  • Hall Effect in CeCu<SUB>2</SUB>Si<SUB>2</SUB> under Pressure

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

    Journal of the Physical Society80   SA061-1-SA061-3   2011年

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

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

    Journal of Physics: Conference Series200 ( 1 ) 012062-1-012062-4   2010年

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

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

    Nuclear Instruments and Methods in Physics Research A600 ( 1 ) 240 - 242   2009年2月

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  • Magnetism and crystalline electric field in RRhIn<SUB>5</SUB> (R : rare earth)(共著)

    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 B403 ( 5-9 ) 1023 - 1025   2008年4月

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  • Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn<SUB>3</SUB>: An <SUP>115</SUP>In-NQR study under pressure(共著)

    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 B77 ( 6 ) 064508-1-064508-12   2008年2月

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  • Magnetic properties and crystalline electric field scheme in RRhIn<SUB>5</SUB> (R : rare earth)(共著)

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

    Journal of the Physical Society of Japan76 ( 6 ) 064702-1-064702-16   2007年6月

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

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

    Journal of Magnetism and Magnetic Materials310 ( 2 ) 541 - 547   2007年3月

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

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

    Journal of Magnetism and Magnetic Materials310 ( 2 ) 1016 - 1018   2007年3月

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  • <SUP>115</SUP>In-NQR study of antiferromagnetism and superconductivity in CeRhIn<SUB>5</SUB> and CeIn<SUB>3</SUB> under pressure(共著)

    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 Solids67 ( 1-3 ) 497 - 499   2006年1月

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講演・口頭発表等

  • 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年 

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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年 

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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年 

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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年 

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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年 

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  • Hall effect under pressure in CeCu2Si2

    SCES 2014  2014年 

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  • Metamagnetic transition of itinerant ferromagnet U3P4 under high pressure

    SCES 2013  2013年 

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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年 

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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年 

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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年 

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  • Electrical Resistivity of Zeolite LSX Loaded with Potassium Metal

    15th International Symposium on Intercalation Compounds  2009年 

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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年 

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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年 

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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年 

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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年 

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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年 

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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年 

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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年 

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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年 

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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年 

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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年 

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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年 

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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年 

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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年 

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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年 

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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年 

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  • MAGNETIC PROPERTIES OF TRANSITION METAL CLUSTERS IN ZEOLITE X

    ICM2006  2006年 

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受賞

  • 第12回日本物理学会論文賞

    2007年  

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    受賞国:日本国

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担当授業科目

  • 低温磁性物理学 (2020年度) 前期  - その他

  • 固体物理学3 (2020年度) 3・4学期  - 木3,木4

  • 固体物理学5 (2020年度) 第3学期  - 木3,木4

  • 固体物理学6 (2020年度) 第4学期  - 木3,木4

  • 教養物理学(電磁気学)1 (2020年度) 第1学期  - 火1,火2

  • 教養物理学(電磁気学)2 (2020年度) 第2学期  - 火1,火2

  • 極限物質物理学 (2020年度) 後期  - 金2,金3

  • 極限環境物理学演習 (2020年度) 通年  - その他

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