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2008 Fiscal Year Final Research Report

Microscopic theory of spin triplet superconductivity originatedby the ferromagnetic coupling due to ring-exchange mechanism

Research Project

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Project/Area Number 18540338
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics II
Research InstitutionChiba University

Principal Investigator

OHTA Yukinori  Chiba University, 大学院・理学研究科, 教授 (70168954)

Project Period (FY) 2006 – 2008
Keywords超伝導 / 磁性 / 強相関電子系 / 物性理論 / リング交換 / スピン三重項超伝導
Research Abstract

三角格子上を運動する電子系の電子スピン間に働くリング交換機構と呼ばれる強磁性結合のミクロな機構を利用してスピン三重項超伝導を導くという新規な超伝導発現機構を提案し、その機構の実現可能性を、三角格子ハバード模型、および関連するジグザグ梯子模型に密度行列繰り込み群(DMRG)という数値的手法を適用し、詳細に検討した。その結果、幅広いパラメータと電子密度の領域に於いて、f波対称性を持つスピン三重項超伝導の発現を示唆する強い数値的証拠を得た。

  • Research Products

    (24 results)

All 2009 2008 2007 2006

All Journal Article (16 results) (of which Peer Reviewed: 16 results) Presentation (8 results)

  • [Journal Article] Spin and Density Excitations in theTriangular-Lattice t- J Model with Multiple-Spin Exchange Interactions : ^3He on Graphite2009

    • Author(s)
      K. Seki, T. Shirakawa and Y. Ohta
    • Journal Title

      Phys. Rev B79

      Pages: 024303/1-8

    • Peer Reviewed
  • [Journal Article] Spin and Mass Excitations in the Doped Multiple Spin Exchange Model on aTriangular Lattice : ^3He on Graphite2009

    • Author(s)
      K.Seki, T. Shirakawa and Y. Ohta, J.Phys.
    • Journal Title

      Conf. Ser 150

      Pages: 032095/1-4

    • Peer Reviewed
  • [Journal Article] Coexistence of Distinct ChargeFluctuations in θ-(BEDT-TTF)_2X2008

    • Author(s)
      S.Nishimoto, M. Shingai and Y. Ohta
    • Journal Title

      Phys. Rev B78

      Pages: 035113/1-9

    • Peer Reviewed
  • [Journal Article] Charge and Spin Excitation Spectra in the One-Dimensional Hubbard Modelwith Next-Nearest-Neighbor Hopping2008

    • Author(s)
      S. Nishimoto, T. Shirakawa and Y. Ohta
    • Journal Title

      Phys. Rev B77

      Pages: 115102/1-6

    • Peer Reviewed
  • [Journal Article] Phase Diagram of the One-DimensionalHubbard Model with Next-Nearest-Neighbor Hopping2008

    • Author(s)
      S. Nishimoto, K.Sano and Y. Ohta
    • Journal Title

      Phys. Rev B77

      Pages: 085119/1-10

    • Peer Reviewed
  • [Journal Article] Superconductivity in a Model of Two Hubbard Chains Coupled withFerromagnetic Exchange Interaction2008

    • Author(s)
      T. Shirakawa, S. Nishimoto and Y. Ohta
    • Journal Title

      Phys. Rev B77

      Pages: 224510/1-10

    • Peer Reviewed
  • [Journal Article] XVariational Monte Carlo Study on Superconductivity in the AnisotropicTriangular-Lattice Hubbard Models2008

    • Author(s)
      Y. Kataoka and Y. Ohta
    • Journal Title

      J. Phys. Chem. Solids 69

      Pages: 3330-3333

    • Peer Reviewed
  • [Journal Article] Numerical Study on the AnisotropicTriangular-Lattice Hubbard Model at Quarter Filling : Charge Fluctuationswith Three-Fold Periodicity2008

    • Author(s)
      M. Shingai, S. Nishimoto and Y. Ohta
    • Journal Title

      J. Phys. Cheml. Solids 69

      Pages: 3382-338

    • Peer Reviewed
  • [Journal Article] Phase Separation, Spin Polarization,and Triplet Superconductivity in the Hubbard Chains Coupled with Ferromagnetic Zigzag Bonds2007

    • Author(s)
      S. Nishimoto, T. Shirakawa, and Y. Ohta
    • Journal Title

      J. Mag. Mag. Mater 310

      Pages: 669-671

    • Peer Reviewed
  • [Journal Article] Spin-Triplet f-wave Suerconductivityin One-Dimensional Triangular-Lattice Hubbard Models2007

    • Author(s)
      Y. Ohta, T.Shirakawa, and S. Nishimoto
    • Journal Title

      J. Mag.Mag. Mater 310

      Pages: 578-580

    • Peer Reviewed
  • [Journal Article] Spin-Triplet Superconductivity in the Double-Chain Hubbard Model with Ferromagnetic Exchange Interaction2007

    • Author(s)
      Interaction, T.Shirakawa, Y. Ohta, and S. Nishimoto
    • Journal Title

      J. Mag. Mag. Mater 310

      Pages: 663-665

    • Peer Reviewed
  • [Journal Article] Spin-Triplet Suerconductivity in theHubbard Chains Coupled with Ferromagnetic Exchange Interaction2007

    • Author(s)
      S.Nishimoto, T. Shirakawa, and Y. Ohta
    • Journal Title

      Physica C460-462

      Pages: 1059-1060

    • Peer Reviewed
  • [Journal Article] Spin-Triplet f-Wave Pairing in thea One-Dimensional Triangular-Lattice Hubbard Model : Possible Relevance to Superconductivity in Bechgaard Salts2007

    • Author(s)
      Y. Ohta, S. Nishimoto, and T. Shirakawa
    • Journal Title

      Physica C460-462

      Pages: 246-247

    • Peer Reviewed
  • [Journal Article] Triplet Superconductivity in aTwo-Chain Hubbard Model by the Ring-Exchange Mechanism2006

    • Author(s)
      T. Shirakawa, S. Nishimoto and Y. Ohta
    • Journal Title

      AIPConference Proceedings Series 850

      Pages: 625-626

    • Peer Reviewed
  • [Journal Article] Ring-Exchange Mechanism for Triplet Superconductivity in a Two-Chain Hubbard Model2006

    • Author(s)
      Y. Ohta, S. Nishimoto,T. Shirakawa, and Y. Yamaguchi
    • Journal Title

      Physica B378-380

      Pages: 439-440

    • Peer Reviewed
  • [Journal Article] Ring-Exchange Mechanism for Triplet Superconductivity in a Two-ChainHubbard Model : Possible Relevance toBechgaard Salts2006

    • Author(s)
      Y. Ohta, S. Nishimoto,T. Shirakawa, and Y. Yamaguchi
    • Journal Title

      Phys.Rev B72

      Pages: 012503/1-4

    • Peer Reviewed
  • [Presentation] グラファイト上に吸着した3Heのスピン及び密度励起 : リング交換を含む三角格子t-J 模型の研究2009

    • Author(s)
      関和弘、白川知功、太田幸則
    • Organizer
      日本物理学会第64回年次大会
    • Place of Presentation
      立教大学
    • Year and Date
      2009-03-30
  • [Presentation] Phase Diagram of the One-Dimensional Hubbard Model with Next-Nearest-Neighbor Hopping2007

    • Author(s)
      西本理、佐野和博、太田幸則
    • Organizer
      日本物理学会第62回年次大会
    • Place of Presentation
      北海道大学
    • Year and Date
      2007-09-21
  • [Presentation] 異方的三角格子拡張ハバード模型における3倍周期電荷揺らぎと励起スペクトル2007

    • Author(s)
      白川知功、新貝学、西本理、太田幸則
    • Organizer
      日本物理学会2007年春季大会
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2007-03-19
  • [Presentation] 変分モンテカルロ法による異方的三角格子ハバード模型の研究2007

    • Author(s)
      片岡祐己、太田幸則
    • Organizer
      日本物理学会2007年春季大会
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2007-03-19
  • [Presentation] 三鎖拡張ハバード模型の電荷秩序化と超伝導に関する弱結合理論2007

    • Author(s)
      中田翔、白川知功、太田幸則
    • Organizer
      日本物理学会2007年春季大会
    • Place of Presentation
      鹿児島大学
    • Year and Date
      2007-03-19
  • [Presentation] 異方的三角格子系における電荷秩序の融解と異常金属相に関する数値的研究2006

    • Author(s)
      新貝学、白川知功、西本理、太田幸則
    • Organizer
      日本物理学会2006年秋季大会
    • Place of Presentation
      千葉大学
    • Year and Date
      2006-09-24
  • [Presentation] 変分モンテカルロ法による三鎖ハバード模型の超伝導に関する研究2006

    • Author(s)
      片岡祐己、太田幸則
    • Organizer
      日本物理学会2006年秋季大会
    • Place of Presentation
      千葉大学
    • Year and Date
      2006-09-24
  • [Presentation] 強磁性相互作用で結合した2鎖ハバード模型の超伝導の理論2006

    • Author(s)
      白川知功、太田幸則、西本理
    • Organizer
      日本物理学会2006年秋季大会
    • Place of Presentation
      千葉大学
    • Year and Date
      2006-09-23

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Published: 2010-06-10   Modified: 2016-04-21  

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