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Investigation of the symmetry of superconducting gap and the FFLO state in a novel organic superconductor with the charge disproportionation

Research Project

Project/Area Number 24540353
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Condensed matter physics II
Research InstitutionHokkaido University

Principal Investigator

KAWAMOTO Atsushi  北海道大学, 理学(系)研究科(研究院), 教授 (60251691)

Co-Investigator(Kenkyū-buntansha) IHARA Yoshihiko  北海道大学, 理学研究院, 講師 (80598491)
Project Period (FY) 2012-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords13C-NMR / FFLO / 超伝導 / 電荷秩序 / NMR / FFLO / 有機伝導体
Outline of Final Research Achievements

The organic salt, beta’’-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2 is suggested to be a novel organic superconductor mediated by charge fluctuations. In addition, the upper critical field exceed its Pauli limit was reported.
We performed single crystal 13C-NMR experiments on the sample with selective site isotope substitution and found the charge separation with 0.6e and 0.13e for each. We also discussed the charge disproportionation pattern using the result of the ratio of the peak intensity. We also performed single crystal 13C-NMR experiments on the sample of Fe modification where non-magnetic Ga ions were replaced with magnetic Fe ions to investigate the influence of the magnetism of Fe ions to the superconductivity. As the results we found the negative exchange interaction from Fe ions and estimated the characteristic timescale of Fe ions dynamics under the field, suggesting the possibility of a field induced superconductivity of the Fe salt.

Report

(4 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • 2012 Research-status Report
  • Research Products

    (19 results)

All 2015 2014 2013 2012

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Acknowledgement Compliant: 1 results) Presentation (14 results) (of which Invited: 1 results)

  • [Journal Article] 13C NMR study of the charge-ordered state near the superconducting transition in the organic superconductor beta''-(BEDT-TTF)4[(H3O)Ga(C2O4)3] C6H5NO22014

    • Author(s)
      Y. Ihara, M. Jeong, H. Mayaffre, C. Berthier, M. Horvati, H. Seki, and A. Kawamoto
    • Journal Title

      Physical Review B

      Volume: 90 Issue: 12

    • DOI

      10.1103/physrevb.90.121106

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Microscopic modulation of local density of states in superconducting alpha-(BEDT-TTF)2NH4Hg(SCN)4 studied by site-selective 13C-NMR spectroscopy2014

    • Author(s)
      Y. Ihara, K. Noda, and A. Kawamoto
    • Journal Title

      Physical Review B

      Volume: 90 Issue: 4

    • DOI

      10.1103/physrevb.90.041107

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 13C NMR study of superconductivity near charge instability realized in β''-(BEDT-TTF)4[(H3O)Ga(C2O4)3・C6H5NO22013

    • Author(s)
      Y. Ihara, H. Seki, A. Kawamoto
    • Journal Title

      Journal of Physical Society of Japan

      Volume: 82 Pages: 83701-83701

    • NAID

      210000132674

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Charge disproportionation with lattice distortion of α-(BEDT-TTF)2RbHg(SCN)4 observed by 13C-NMR2013

    • Author(s)
      Kazuki Noda, Yoshihiko Ihara, Atsushi Kawamoto
    • Journal Title

      Physical Review B

      Volume: 87 Issue: 8 Pages: 85105-85105

    • DOI

      10.1103/physrevb.87.085105

    • NAID

      120005228307

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Magnetic and Electric Properties of Organic Conductors Probed by 13C-NMR Using Selective-Site Substituted Molecules2012

    • Author(s)
      Shinji Hirose, Masaki Misawa, and Atsushi Kawamoto
    • Journal Title

      Crystal

      Volume: 2 Issue: 3 Pages: 1034-1057

    • DOI

      10.3390/cryst2031034

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Presentation] 電荷秩序系BEDT-TTF物質のNMR研究2015

    • Author(s)
      井原慶彦
    • Organizer
      日本物理学会第70回年次大会(2015年)
    • Place of Presentation
      早稲田大学 (東京都)
    • Year and Date
      2015-03-21 – 2015-03-24
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] beta''-(BEDT-TTF)4[(H3O)Fe(C2O4)]C6H5Brの高磁場NMR実験によるスピン状態の研究2015

    • Author(s)
      7.二見洋輔*、井原慶彦、河本充司、C. J. Gomez-Garcia
    • Organizer
      日本物理学会第70回年次大会(2015年)
    • Place of Presentation
      早稲田大学(東京都)
    • Year and Date
      2015-03-21 – 2015-03-24
    • Related Report
      2014 Annual Research Report
  • [Presentation] 強磁場下13C NMR測定による有機超伝導体;beta''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2の電荷秩序状態の研究2014

    • Author(s)
      井原慶彦*, M. Jeong, H. Mayaffre, C. Berthier, M. Horvati, 関春海、 河本充司
    • Organizer
      日本物理学会2014年秋季大会(中部大学)
    • Place of Presentation
      中部大学(愛知県春日井市)
    • Year and Date
      2014-09-07 – 2014-09-10
    • Related Report
      2014 Annual Research Report
  • [Presentation] Charge ordering transition near superconductivity in beta''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]C6H5NO2 studied by 13C NMR spectroscopy2014

    • Author(s)
      Y. Ihara*, H. Seki, A. Kawamoto, M. Jeong, H. Mayaffre, C. Berthier, and M. Horvati
    • Organizer
      International Conference on Strongly Correlated Electron Systems
    • Place of Presentation
      Grenoble(France)
    • Year and Date
      2014-07-07 – 2014-07-11
    • Related Report
      2014 Annual Research Report
  • [Presentation] 13C NMR study of p-d interaction in quasi-two dimensional organic superconductor beta''-(BEDT-TTF)4[(H3O)Fe(C2O4)3]C6H5Br2014

    • Author(s)
      Y. Futami, Y. Ihara, A. Kawamoto, and C. J. Gomes-Garcia
    • Organizer
      International Conference on Strongly Correlated Electron Systems
    • Place of Presentation
      Grenoble(France)
    • Year and Date
      2014-07-07 – 2014-07-11
    • Related Report
      2014 Annual Research Report
  • [Presentation] 13C-NMR測定によるβ''-(BEDT-TTF)4[(H3O)Fe(C2O4)3]・C6H5Brのπ-d相互作用の研究2014

    • Author(s)
      二見洋輔、井原慶彦、河本充司
    • Organizer
      日本物理学会第69回年次大会
    • Place of Presentation
      東海大学 (神奈川県平塚市)
    • Related Report
      2013 Research-status Report
  • [Presentation] Superconductivity and charge instability in β"-(BEDT-TTF)4[(H3O)Ga(C2O4)3]・C6H5NO2 studied by 13C NMR2013

    • Author(s)
      Y. Ihara, H. Seki, A. Kawamoto
    • Organizer
      International Symposium on Crystalline Organic Metals Superconductors and Magnets
    • Place of Presentation
      Delta Hotel and Resorts (Montreal, Canada)
    • Related Report
      2013 Research-status Report
  • [Presentation] 13C NMR測定による有機超伝導体β''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]・C6H5NO2の高温電荷異常の研究2013

    • Author(s)
      井原慶彦、二見洋輔、関春海、河本充司
    • Organizer
      日本物理学会2013年秋季大会
    • Place of Presentation
      徳島大学(徳島県徳島市)
    • Related Report
      2013 Research-status Report
  • [Presentation] 有機超伝導体β''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]・C6H5NO2のSTM分光2013

    • Author(s)
      高橋周、岡雄基、延兼啓純、松永悟明、野村一成、関春海、井原慶彦、河本充司
    • Organizer
      日本物理学会2013年秋季大会
    • Place of Presentation
      徳島大学(徳島県徳島市)
    • Related Report
      2013 Research-status Report
  • [Presentation] 有機超伝導体β''-(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(西条市)
    • Related Report
      2012 Research-status Report
  • [Presentation] Pressure dependence of commensurate antiferromagnetic spectrum in (TMTTF)2Br from 13C-NMR2012

    • Author(s)
      Shinji Hirose, Liu Yang, Masaki Misawa, and Atsushi Kawamoto
    • Organizer
      International Conference on Science and Technology of Synthetic Metals 2012
    • Place of Presentation
      The Hyatt Regency Atlanta(USA)
    • Related Report
      2012 Research-status Report
  • [Presentation] Spin singlet superconductivity in organic superconductor b''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]-C6H5NO2 probed by 13C NMR2012

    • Author(s)
      Harumi Seki, Yoshihiko Ihara, and Atsushi Kawamoto
    • Organizer
      International Conference on Science and Technology of Synthetic Metals 2012
    • Place of Presentation
      The Hyatt Regency Atlanta(USA)
    • Related Report
      2012 Research-status Report
  • [Presentation] 13C NMR study of charge fluctuation induced superconductivity in b''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]-C6H5NO22012

    • Author(s)
      Yoshihiko Ihara, Harumi Seki, and Atsushi Kawamoto
    • Organizer
      The 19th International Conference on Magnetism 2012 (ICM2012)
    • Place of Presentation
      釜山国際展示場( Koria)
    • Related Report
      2012 Research-status Report
  • [Presentation] a-(BEDT-TTF)2RbHg(SCN)4の13C NMR2012

    • Author(s)
      野田航生,井原慶彦,河本充司
    • Organizer
      日本物理学会 2012年秋季大会
    • Place of Presentation
      横浜国立大学(横浜市)
    • Related Report
      2012 Research-status Report

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Published: 2013-05-31   Modified: 2020-05-15  

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