Observation of Spin and Charge ordering in Quasi 1-D organic superconductor under high pressure

2010 Fiscal Year Final Research Report

• Project/Area Number: 21740263
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Nihon University (2010); Aoyama Gakuin University (2009)
• Principal Investigator: ITOI Miho 日本大学, 医学部, 助教 (40422448)
• Project Period (FY): 2009 – 2010
• Keywords: 擬一次元系 / 有機導体 / TMTTF / 超伝導 / 高圧力下測定

Research Abstract

Quasi 1 D organic conductor (TMTTF)_2SbF_6 exhibits a charge ordering (T_<CO>=154K) and antiferromagnetic transition (AF: T_N=8K) at ambient pressure. Recently, superconducting (SC) phase was observed at Tc = 2.8 K under ～6 GPa, and a newly improved temperature-pressure (T-P) phase diagram was proposed based on the resistivity under high pressure. The expected phase change is AF(I) -sP (spin Peierls) or spin gap (SG) -AF(II). To investigate the spin state up to 1 GPa at low temperatures, the magnetic susceptibility measurement has been carried out with CuBe pressure clamp cell designed for organic materials. We have clearly observed AF phase was suppressed with applying external pressures and it disappeared at 0.6 GPa.

Research Products

• [Journal Article] Anisotropy of Upper Critical Field in a One-Dimensional Organic System, (TMTTF)_2PF_6 under High Pressure (2012)
  • Author(s): M. Kano, H. Mori, K. Matsubayashi, M. Itoi, M. Hedo, T. P. Murphy, S. W. Tozer, Y. Uwatoko, and T. Nakamura
  • Journal Title: J. Phys. Soc. Jpn. Volume: 81 Pages: 024716(7pages)
  • Peer Reviewed
• [Journal Article] Completely hydrostatic pressure effect of anisotropic resistivity in the 1-D organic conductor (TMTTF)_2SbF_6 (2010)
  • Author(s): Miho Itoi, Yasuyuki Ishii, Shuho Takekoshi, Haruhisa Kitano, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Toshikazu Nakamura
  • Journal Title: Physica C: Superconductivity Volume: Volume 470, Supplement 1 Pages: S594-S595
  • Peer Reviewed
• [Journal Article] 超高圧下における擬一次元有機導体(TMTTF)_2X(X=PF_6,AsF_6,SbF_6,TaF_6)の物性研究 (2010)
  • Author(s): 糸井充穂、荒木千恵子、松林和幸、上床美也、辺土正人、中村敏和
  • Journal Title: 日本大学医学部一般教育研究紀要 Volume: 第38号
• [Presentation] 擬一次元系有機導体(TMTTF)_2TaF_6の高圧力下における電気輸送特性 (2011)
  • Author(s): 糸井充穂、松林和幸、上床美也、中村敏和
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山
  • Year and Date: 2011-09-23
• [Presentation] 圧力下磁化率測定による(TMTTF)_2SbF_6のスピン状態の解明 (2011)
  • Author(s): 糸井充穂、石井康之、松林和幸、上床美也、中村敏和
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟
  • Year and Date: 2011-03-26
• [Presentation] Pressure Effect On Quasi-One-dimensional Organic conductor (TMTTF)_2SbF_6:Magnetic susceptibility under pressure (2010)
  • Author(s): Miho Itoi, Yasuyuki Ishii, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Toshikazu Nakamura
  • Organizer: International Conference on Science and Technology of Synthetic Metals
  • Place of Presentation: Kyoto
  • Year and Date: 2010-07-08
• [Presentation] Completely hydrostatic pressure effect of anisotropic resistivity in the 1-D organic conductor (TMTTF)_2SbF_6 (2009)
  • Author(s): Miho Itoi, Yasuyuki Ishii, Shuho Takekoshi, Haruhisa Kitano, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Toshikazu Nakamura
  • Organizer: 9th International Conference on Materials and Mechanisms of Superconductivity
  • Place of Presentation: Tokyo
  • Year and Date: 20090900
• [Presentation] (2009)
  • Author(s): 糸井充穂、石井康之、松林和幸、上床美也、中村敏和
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本
  • Year and Date: 2009-09-27