Microscopic investigation of unconventional superconducting state realizing near the upper critical field

• Project/Area Number: 23740249
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Hokkaido University
• Principal Investigator: IHARA Yoshihiko 北海道大学, 大学院・理学研究院, 助教 (80598491)
• Project Period (FY): 2011 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2011: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 超伝導 / 核磁気共鳴 / 強相関電子系 / FFLO状態 / 強相関系 / 有機導体

Research Abstract

We have carried out 13C NMR experiment on a molecular superconductor ''-(BEDT-TTF)4[(H_3O)Ga(C_2O_4)3]・C_6H_5NO_2, which possesses the upper critical field more than twice larger than the Pauli depairing limit, and demonstrated that the superconducting pairs are in the spin-singlet state. This result indicates the possibility of unconventional superconducting state in high magnetic fields.

Research Products

• [Journal Article] Commensurability of the spin-density-w ave state of (TMTSF)2PF6 observed by 13C-NMR (2013)
  • Author(s): S. Nagata, M. Misawa, Y. Ihara, A. K awamoto
  • Journal Title: Physical Review Letters Volume: 110 Pages: 167001-167001
  • Peer Reviewed
• [Journal Article] Commensurability of the spin-density-wave state of (TMTSF)2PF6 observed by 13C-NMR (2013)
  • Author(s): S. Nagata, M. Misawa, Y. Ihara, A. Kawamoto
  • Journal Title: Physical Review Letters Volume: 110 Issue: 16 Pages: 167001-167001
  • DOI: 10.1103/physrevlett.110.167001
  • Peer Reviewed
• [Journal Article] Local electric state of noncentrosymmetric superconductor Mo3Al2C revealed by Mo NQR and NMR experiment (2012)
  • Author(s): Y. Ihara, Y. Kimura, K. Kumagai, E. Bauer, G. Rogl, P. Rogl
  • Journal Title: Journal of Physics: conference series Volume: 400 Pages: 22033-22033
  • Peer Reviewed
• [Journal Article] Local electric state of noncentrosymmetric superconductor MO3Al2C revealed by Mo NQR and NMR experiments (2012)
  • Author(s): Y. Ihara, Y. Kimura, K. Kumagai, E. Bauer, G. Rogl, P. Rogl
  • Journal Title: Journal of Physics: conference series Volume: 400 Pages: 22033-22033
  • Peer Reviewed
• [Journal Article] Superconductivity induced by longitudinal ferromangnetic fluctuations in UCoGe (2012)
  • Author(s): T. hattori, Y. Ihara, Y. Nakai, K. Ishida, Y. Tada, S. Fujimoto, N. Kawakami, E. Osaki, K. Deguchi, N.K. Sato, I. Satoh
  • Journal Title: Physical Review Letters Volume: 108
  • Peer Reviewed
• [Journal Article] Spin dytnamics at the Mott transition an in the metallic state of the Cs3C60 superconducting phases (2011)
  • Author(s): Y. Ihara, H. Alloul, P. Wzietek, D. Pontiroli, M. Mazzani, M. Ricco
  • Journal Title: EPL Volume: 94 Issue: 3 Pages: 37007-37007
  • DOI: 10.1209/0295-5075/94/37007
  • Peer Reviewed
• [Presentation] 有機超伝導体''-(BEDT-TTF)4[(H_3O)Ga(C_2O_4)3]・C_6H_5NO_2における超伝導転移直上の電荷秩序 (2013)
  • Author(s): 井原慶彦、関春海、河本充司
  • Organizer: 日本物理学会第68回年次大会
  • Place of Presentation: 広島大学(東広島市)
• [Presentation] 有機超伝導体b''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2における超伝導転移直上の電荷秩序 (2013)
  • Author(s): 井原慶彦、関春海、河本充司
  • Organizer: 日本物理学会第68回年次大会
  • Place of Presentation: 広島大学 （東広島市）
• [Presentation] Spin single superconductivity in organic superconductor ''-(BEDT-TTF)4[(H_3O)Ga(C_2O_4)3]・C_6H_5NO_2 probed by 13C NMR (2012)
  • Author(s): H. Seki, Y. Ihara, A. Kawamoto
  • Organizer: International conference on science and techn ology of synthetic metals 2012
  • Place of Presentation: Hyatt Regency Atlanta (USA)
• [Presentation] 13C NMR study of charge fluctuation induc ed superconductivity in ''-(BEDT-TTF)4[(H_3O)Ga(C_2O_4)3]・C_6H_5NO_2 (2012)
  • Author(s): Y. Ihara, H. Seki, A. Kawamoto
  • Organizer: The 19th international conference on magnetism2012
  • Place of Presentation: BEXCO (Koria)
• [Presentation] Spin singlet superconductivity in organic superconductor b''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2 probed by 13C NMR (2012)
  • Author(s): H. Seki, Y. Ihara, A. Kawamoto
  • Organizer: International conference on science and technology of synthetic metals 2012
  • Place of Presentation: The Hyatt Regency Atlanta (USA)
• [Presentation] 13C NMR study of charge fluctuation induced superconductivity in b''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2 (2012)
  • Author(s): Y. Ihara, H. Seki, A. Kawamoto
  • Organizer: The 19th international conference on magnetism 2012
  • Place of Presentation: Bexco (Koria)
• [Presentation] 13C NMRによるbeta''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2の超伝導直上に見られる異常金属状態の研究 (2012)
  • Author(s): 関春海、井原慶彦、河本充司
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学（兵庫県）
• [Presentation] 13C NMRによるbeta''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2の電荷秩序と超伝導の研究 (2011)
  • Author(s): 関春海、井原慶彦、河本充司
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学（富山県）