Investigations on the antiferromagnetic insulating and superconducting phases of incommensurate organic superconductors

• Project/Area Number: 19740202
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: KAWAMOTO Tadashi Tokyo Institute of Technology, 大学院・理工学研究科, 助教 (60323789)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,600,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥300,000); Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2007: ¥2,300,000 (Direct Cost: ¥2,300,000)
• Keywords: 有機伝導体 / 不整合格子 / 反強磁性 / 超伝導 / バンド充填率 / 有機超伝導伝導体 / 金属-絶縁体転移 / 反強磁性絶縁体 / 相図 / 有機超伝導体

Research Abstract

不整合格子系有機超伝導体のなかで、常圧では金属.絶縁体転移を示す物質(MDT-TS)(AuI_2)_<0.441>の反強磁性絶縁相が50Kという高いネール温度、6.9Tという高いフロップ磁場を有することを実験的に明らかにした。また、超伝導相は1.0-1.8GPaの広い圧力領域で存在し、1.27GPaで転移温度は最高の4.9Kを示すことを実験的に明らかにした。これらの結果から、当初の目的である温度-磁場-圧力相図を得ることができた。

Research Products

• [Journal Article] Nonlinear dynamics of conduction electrons in organic conductors (2009)
  • Author(s): T. Mori, T. Ozawa, Y. Bando, T. Kawamoto, S. Niizeki, H. Mori, and I. Terasaki
  • Journal Title: Phys. Rev. B 79
  • NAID: 120006581959
  • Peer Reviewed
• [Journal Article] Nonlinear dynamics of conduction electrons in organic conductors (2009)
  • Author(s): 森健彦、(4)川本正、他
  • Journal Title: Phys. Rev. B 79
  • NAID: 120006581959
  • Peer Reviewed
• [Journal Article] Antiferromagnetic ordering of the incommensurate organic superconductor (MDT-TS)(AuI_2)_<0.441> with a high spin-flop field (2008)
  • Author(s): T. Kawamoto, Y. Bando, T. Mori, T. Konoike, Y. Takahide, T. Terashima, S. Uji, K. Takimiya, and T. Otsubo
  • Journal Title: Phys. Rev. B 77
  • Peer Reviewed
• [Journal Article] Flat resistivity in θ-phase charge-transfer salts of selenium-containing TMET-TTP derivatives (2008)
  • Author(s): Y. Bando, M. Ashizawa, T. Kawamoto, and T. Mori
  • Journal Title: Bull. Chem. Soc. Jpn. 81 Pages: 947-955
  • NAID: 10024280656
  • Peer Reviewed
• [Journal Article] Dielectric response and electric-field-induced metastable state in an organic conductor β-(meso-DMBEDT-TTF)_2PF_6 (2008)
  • Author(s): S. Niizeki, F. Yoshikane, K. Kohno, K. Takahashi, H. Mori, Y. Bando, T. Kawamoto, and T. Mori
  • Journal Title: J. Phys. Soc. Jpn. 77
  • NAID: 110006821291
  • Peer Reviewed
• [Journal Article] Giant nonlinear conductivity and spontaneous current oscillation in an incommensurate organic superconductor (2008)
  • Author(s): T. Mori, Y. Bando, T. Kawamoto, I. Terasaki, K. Takimiya, and T. Otsubo
  • Journal Title: Phys. Rev. Lett. 100
  • Peer Reviewed
• [Journal Article] Isotropic uniaxial strain effect on the incommensurate organic superconductor: (MDT-TS)(AuI_2)_<0.441> (2008)
  • Author(s): Y. Bando, T. Kawamoto, T. Mori, K. Takimiya, and T. Otsubo
  • Journal Title: J. Phys. Soc. Jpn. 77
  • NAID: 110006594912
  • Peer Reviewed
• [Journal Article] Antiferromagnetic ordering of the incommensurate organic superconductor (MDT-TS)(AuI_2)_<0.441> with a high spin-flop field (2008)
  • Author(s): 川本正、他
  • Journal Title: Phys. Rev. B 77
  • Peer Reviewed
• [Journal Article] Flat resistivity in θ-phase charge-transfer salts of selenium-containing TMET-TTP derivative (2008)
  • Author(s): 坂東祥匡、(3)川本正、他
  • Journal Title: Bull. Chem. Soc. Jpn. 81 Pages: 947-955
  • NAID: 10024280656
  • Peer Reviewed
• [Journal Article] Dielectric responce and electric-field-induced metastable state in an organic conductor β-(meso-DMBEDT-TTF)_2PF_6 (2008)
  • Author(s): 新関彰一、(7)川本正、他
  • Journal Title: J. Phys. Soc. Jpn 77
  • Peer Reviewed
• [Journal Article] Isotropic uniaxial strain effect on the incommensurate organic superconductor:(MDT-TS)(AuI_2)_0.441 (2008)
  • Author(s): 坂東祥匡、川本正、他
  • Journal Title: J. Phys. Soc. Jpn. 77
  • Peer Reviewed
• [Journal Article] Giant nonlinear conductivity and spontaneous current oscillation in an incommensurate organic superconductor (2008)
  • Author(s): 森健彦、川本正、他
  • Journal Title: Phys. Rev. Lett. 100
  • Peer Reviewed
• [Journal Article] Organic conductors - from fundamentals to nonlinear conductivity (2007)
  • Author(s): T. Mori and T. Kawamoto
  • Journal Title: Annu. Rep. Prog. Chem., Sect. C : Phys. Chem. 103 Pages: 134-172
  • Peer Reviewed
• [Journal Article] Nonlinear conductivity with an extremely small threshold electric field in the organic conductor (TSM-TTP)(I_3)_<5/3> (2007)
  • Author(s): T. Mori, T. Kawamoto, I. Terasaki, T. Kakiuchi, and H. Sawa
  • Journal Title: Phys. Rev. B 75
  • Peer Reviewed
• [Journal Article] Domain formation in the structural phase transition of the organic superconductor κ_L-(DMEDO-TSeF)_2[Au(CN)_4](THF) (2007)
  • Author(s): T. Kawamoto, T. Mori, T. Kakiuchi, H. Sawa, T. Shirahata, M. Kibune, H. Yoshino, and T. Imakubo
  • Journal Title: Phys. Rev. B 76
  • Peer Reviewed
• [Journal Article] Domain formation in the structural phase transition of the organic superconductor KL-(DMED0-TSeF)_2 [Au(CN)_4](THF) (2007)
  • Author(s): 川本正、他
  • Journal Title: Phys. Rev. B 76
  • Peer Reviewed
• [Journal Article] Nonlinear conductivity with an extremely small threshold electric field in the organic conductor (TSM-TTP)(I_3)_5/3 (2007)
  • Author(s): 森健彦、川本正、他
  • Journal Title: Phys. Rev. B 75
  • Peer Reviewed
• [Journal Article] Organic conductors - from fundamentals to nonlinear conductivity (2007)
  • Author(s): 森健彦、川本正
  • Journal Title: Annu. Rep. Prog. Chem., Sect. C: Phys. Chem. 103 Pages: 134-172
  • Peer Reviewed
• [Presentation] 不整合格子系有機超伝導体の構造と電子物性(日本物理学会若手奨励賞受賞記念講演) (2009)
  • Author(s): 川本正
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大
  • Year and Date: 2009-03-30
• [Presentation] 不整合格子系有機超伝導体の構造と電子物性 (2009)
  • Author(s): 川本正
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大
  • Year and Date: 2009-03-30
• [Presentation] ドメイン構造を有する有機超伝導体κ_L-(DMEDO-TSeF)_2[Au(CN)_4](THF)のフェルミ面 (2008)
  • Author(s): 川本正、森健彦、山口尚秀、宇治進也、David Graf、James S. Brooks、白旗崇、木舩愛、吉野浩子、今久保達郎
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 岩手大
  • Year and Date: 2008-09-23
• [Presentation] ドメイン構造を有する有機超伝導体KL-(DMEDO-TSeF)_2[Au(CN)_4](THE)のフエルミ面 (2008)
  • Author(s): 川本正
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 岩手大
  • Year and Date: 2008-09-23
• [Presentation] Anomalous magnetoresistance and interlayer coherency of the highly 2D organic superconductor κ_H-(DMEDO-TSeF)_2[Au(CN)_4](THF) (2008)
  • Author(s): 川本正、森健彦、David Graf、James S Brooks、宇治進也、白旗崇、木舩愛、吉野浩子、今久保達郎
  • Organizer: 25th International conference on LowTemperature Physics (LT25)
  • Place of Presentation: Amsterdam (オランダ)
  • Year and Date: 2008-08-11
• [Presentation] Anomalous magnetoresistance and interlayer coherency of the highly 2D organic superconductor KH-(DMEDO-TSeF)_2[Au(CN)_4](THF) (2008)
  • Author(s): 川本正
  • Organizer: International conference on Low Temperature Phy sics (LT25)
  • Place of Presentation: オランダ・アムステルダム
  • Year and Date: 2008-08-11
• [Presentation] High magnetic field properties of the layered organic superconductor κ_H-(DMEDO-TSeF)_2[Au(CN)_4](THF) with thick anion layers (2008)
  • Author(s): 川本正
  • Organizer: International Symposium onMolecular Conductors (ISMC 2008)
  • Place of Presentation: 岡崎コンファレンスセンター
  • Year and Date: 2008-07-25
• [Presentation] High magnetic field properties of the layered organic superconductor KH-(DMEDO-TSeF)_2[Au(CN)_4](THF) with thick anion layer (2008)
  • Author(s): 川本正
  • Organizer: International Symposium on Molecular Conductors (ISMC 2008)
  • Place of Presentation: 岡崎コンファレンスセンター
  • Year and Date: 2008-07-25
• [Presentation] 2次元系有機超伝導体κ_H-(DMEDO-TSeF)_2[Au(CN)_4](THF)の強磁場角度依存性磁気抵抗 (2008)
  • Author(s): 川本正、森健彦、David Graf、James S Brooks、宇治進也、白旗崇、木舩愛、吉野浩子、今久保達郎
  • Organizer: 日本物理学会第63回年次大会
  • Place of Presentation: 近畿大
  • Year and Date: 2008-03-23
• [Presentation] 2次元系有機超伝導体KH-(DMEDO-TSeF)2[Au(CN)4](THF)の強磁場角度依存性磁気抵抗 (2008)
  • Author(s): 川本 正
  • Organizer: 日本物理学会第63回年次大会
  • Place of Presentation: 近畿大
• [Presentation] Interlayer coherency and anomalous magnetoresistance of the highly 2D organic superconductor κ_H-(DMEDO-TSeF)_2[Au(CN)_4](THF) (2007)
  • Author(s): 川本正、森健彦、山口尚秀、寺嶋太一、宇治進也、白旗崇、木舩愛、吉野浩子、今久保達郎
  • Organizer: The Seventh International Symposium on Crystalline Organic Metals, Superconductors and Ferromagnets, ISCOM'2007
  • Place of Presentation: Peniscola(スペイン)
• [Presentation] Interlayer coherency and anomalous magnetoresistance of the highly 2D organic supercondKHDMEDTSeF)_2lAu(CN)4KTHF) (2007)
  • Author(s): 川本正
  • Organizer: The Seventh International Symposium onCrystalline Organic Metals, Superconductors andFerromagnet
  • Place of Presentation: スペイン.ペニスコラ
• [Remarks] 本研究成果を合わせたこれまでの研究成果により、2009年3月に日本物理学会若手奨励賞を受賞し、受賞講演を行った。