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Electronic state of new type layered organic superconductors including strongly correlated insulating layers

Research Project

Project/Area Number 16K05436
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Condensed matter physics II
Research InstitutionTokyo Institute of Technology

Principal Investigator

Kawamoto Tadashi  東京工業大学, 物質理工学院, 助教 (60323789)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords超伝導 / 結晶構造 / 電荷秩序 / モット絶縁体 / 強相関電子系 / 反強磁性 / 分子性固体
Outline of Final Research Achievements

The ground state of the genuine Mott insulator (BEDT-TTF)TaF6 is an antiferromagnetic insulating state below the Neel temperature 10 K. Structural and electronic states of organic conductors composed of (BEDT-TTF)2TaF6 have been investigated. The kappa-type compound is a dimer-Mott insulator, and has an anisotropic triangular lattice located between the triangular lattice and the one-dimensional limit. This compound shows a paramagnetic state down to 1.6 K, indicating the possibility if a spin liquid phase. The superconducting transition of the layered organic superconductor (EtDTET)(TCNQ) shows strongly sample dependences. The superconducting transition temperature has been measured by the magnetic torque, and the crystal structure of the same sample has been analyzed. The quantum oscillation of two polymorphs in (BEDT-TTF)2Cu(CF3)4(TCE) has been measured; the cross-sectional area of the Fermi surface indicates that the energy band of both compounds is effectively half-filled.

Academic Significance and Societal Importance of the Research Achievements

固体において、同一サイトでの電子のクーロン反発によって絶縁体となるモット絶縁体の研究は古くからなされている。四角格子をもつモット絶縁体はそれに相当する物質がないため、理論からの研究がなされている。(BEDT-TTF)TaF6は四角格子をもつ真性モット絶縁体であり、この物質の基底状態が反強磁性絶縁体であることを実験で確定させたことは、モット絶縁体の研究において重要な結果である。また、このような絶縁体の層が組み込まれた層状超伝導体の電子状態を実験により詳しく調べることで、超伝導発現における絶縁層の必要性の解明に繋がるものである。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (17 results)

All 2019 2018 2017 2016 Other

All Int'l Joint Research (2 results) Journal Article (6 results) (of which Peer Reviewed: 6 results,  Acknowledgement Compliant: 2 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 3 results) Remarks (1 results)

  • [Int'l Joint Research] Argonne National Laboratory(米国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Argonne National Laboratory(米国)

    • Related Report
      2016 Research-status Report
  • [Journal Article] A New Dimer Mott Insulator: κ-(BEDT-TTF)2TaF62018

    • Author(s)
      T. Kawamoto, K. Kurata, and T. Mori
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 87 Issue: 8 Pages: 83703-83703

    • DOI

      10.7566/jpsj.87.083703

    • NAID

      210000134913

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The thermoelectric power of band-filling controlled organic conductors, beta'-(BEDT-TTF)3(CoCl4)2-x(GaCl4)x2018

    • Author(s)
      清田泰裕、川本正、他
    • Journal Title

      J. Mater. Chem. A

      Volume: 6 Issue: 5 Pages: 2004-2010

    • DOI

      10.1039/c7ta06987a

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Successive dimensional transition in (TMTTF)2PF6 revealed by synchrotron x-ray diffraction2017

    • Author(s)
      鬼頭俊介、藤井達也、川本正、他
    • Journal Title

      Phys. Rev. Lett.

      Volume: 119 Issue: 6

    • DOI

      10.1103/physrevlett.119.065701

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Charge ordering transitions of the new organic conductors delta_m- and delta_o-(BEDT-TTF)2TaF62017

    • Author(s)
      川本正、他
    • Journal Title

      Magnetochemistry

      Volume: 3 Issue: 1 Pages: 14-14

    • DOI

      10.3390/magnetochemistry3010014

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Metal-insulator transition of the new one-dimensional organic conductors with complete uniform stacks: (DMEDO-TTF)2X (X = ClO4 and BF4)2016

    • Author(s)
      久米田翔平、川本正、他
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 85 Issue: 9 Pages: 094701-094701

    • DOI

      10.7566/jpsj.85.094701

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Organic Superconductors Including Polar Molecules in an Insulating Layer2016

    • Author(s)
      川本正、森健彦
    • Journal Title

      Butsuri

      Volume: 71 Issue: 8 Pages: 541-546

    • DOI

      10.11316/butsuri.71.8_541

    • NAID

      130005282459

    • ISSN
      0029-0181, 2423-8872
    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Presentation] 有機超伝導体(EtDTET)(TCNQ)の超伝導転移と構造2019

    • Author(s)
      川本正、他
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] ダイマーモット絶縁体kappa-(BEDT-TTF)2TaF6の磁気トルク2018

    • Author(s)
      川本正、他
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] A new dimer Mott insulator kappa-(BEDT-TTF)2TaF62018

    • Author(s)
      川本正、他
    • Organizer
      Gordon Research Conference, Conductivity and Magnetism in Molecular Materials
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 真性モット絶縁体 (BEDT-TTF)TaF6の低温構造2017

    • Author(s)
      川本正、他
    • Organizer
      日本物理学会第72回年次大会
    • Place of Presentation
      大阪大
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] 2種類のδ型(BEDT-TTF)2TaF6における電荷秩序転移2017

    • Author(s)
      川本正、他
    • Organizer
      日本物理学会2017年秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] A genuine Mott insulator β-(BEDT-TTF)TaF62017

    • Author(s)
      川本正、他
    • Organizer
      12th International Symposium on Crystalline Organic Metals, Superconductors and Magnets (ISCOM2017)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 2次元正方格子をもつ真性モット絶縁体 (BEDT-TTF)TaF6の磁気トルク2016

    • Author(s)
      川本正、他
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      金沢大
    • Year and Date
      2016-09-13
    • Related Report
      2016 Research-status Report
  • [Presentation] Structural and electronic properties of the organic superconductors, (BEDT-TTF)2M(CF3)4(TCE) (M = Cu and Ag)2016

    • Author(s)
      川本正、他
    • Organizer
      Gordon Research Conference: Conductivity & Magnetism in Molecular Materials
    • Place of Presentation
      Mount Holyoke College(米国)
    • Year and Date
      2016-08-14
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Remarks]

    • URL

      http://t2r2.star.titech.ac.jp/cgi-bin/researcherpublicationlist.cgi?alldisp=1&q_researcher_content_number=CTT100380472

    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2022-02-16  

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