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2009 Fiscal Year Annual Research Report

新奇な量子スピンフロップ現象の観測を目指す理論的研究

Research Project

Project/Area Number 20030008
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

坂井 徹  Japan Atomic Energy Agency, 量子ビーム応用研究部門, 研究主幹 (60235116)

Keywords量子スピン系 / スピンフロップ / スピンラダー / スピン液体 / スピンギャップ
Research Abstract

強磁性の桁相互作用を持つスピンラダー系IPA-CuCl_3で観測されている2段階のスピンフロップ転移を理論的に説明するために、容易軸異方性を持つスピンラダー系で生じるスピンネマティック相から通常の朝永・ラッティンジャー液体相への新しい量子スピンフロップ転移の理論を構築し、数値対角化と有限サイズスエーリングにより、磁場・異方性についての詳細な相図を導出した。
また、最近注目されているフラストレーション系のひとつであるカゴメ格子反強磁性体の磁化過程において、従来は3分の1磁化プラトーと考えられていた現象が、実はそうではなく、一次元系特有のスピン液体相から二次元的なスピンギャップ相への新しい量子相転移が起きている可能性があることを理論的に示した。

  • Research Products

    (29 results)

All 2010 2009 Other

All Journal Article (11 results) (of which Peer Reviewed: 11 results) Presentation (17 results) Remarks (1 results)

  • [Journal Article] Field Induced Exotic Phenomena of the S=1/2 Three-Leg Quantum Spin Nanotube2010

    • Author(s)
      T.Sakai
    • Journal Title

      Journal of Low Temperature Physics 159

      Pages: 55-58

    • Peer Reviewed
  • [Journal Article] Magnetization Process of the S=1/2 Distorted Diamond Spin Chain with the Dzyaloshinsky-Moriya interaction2010

    • Author(s)
      T.Sakai
    • Journal Title

      Journal of Physics : Conference Series 200

      Pages: 022052-1-4

    • Peer Reviewed
  • [Journal Article] Half Magnetization Plateau of Frustrated S=1 Antiferromagnetic Chain2010

    • Author(s)
      T.Tonegawa
    • Journal Title

      Journal of Physics : Conference Series 200

      Pages: 022065-1-4

    • Peer Reviewed
  • [Journal Article] Field-Induced Nematic Phase in the Spin Ladder System with Easy-Axis Anisotropy2010

    • Author(s)
      T.Sakai
    • Journal Title

      Physica Status Solidi B 247

      Pages: 583-585

    • Peer Reviewed
  • [Journal Article] First-Order Phase Transition between One-Third Magnetization Plateau States in an Anisotropic(S, S')Spin Alternating Chain2010

    • Author(s)
      T.Tonegawa
    • Journal Title

      Physica Status Tolidi 247

      Pages: 688-690

    • Peer Reviewed
  • [Journal Article] Magnetization Process of the Kagome Lattice Antiferromagnet2010

    • Author(s)
      H.Nakano
    • Journal Title

      Journal of the Physical Society of Japan 79

      Pages: 053707-1-4

    • Peer Reviewed
  • [Journal Article] Polarization Plateau in Atomic Fermi Gas Loaded on Triangular Optical Lattice2009

    • Author(s)
      M.Okumura
    • Journal Title

      Physical Review A 79

      Pages: 061602(R)-1-4

    • Peer Reviewed
  • [Journal Article] Dzylashinsky-Moriya Interaction in the S=1/2 Quasi-One-Dimensional Antiferromagnet Cu_2Cl_4・H_8C_4SO_2 as Determined via High-Frequency ESR2009

    • Author(s)
      M.Fujisawa
    • Journal Title

      Physical Review B 80

      Pages: 012408-1-4

    • Peer Reviewed
  • [Journal Article] Magnetic Field versus Temperature Phase Diagram of the Spin-1/2 Alternating-Bond Chain Compound F_5PNN2009

    • Author(s)
      Y.Yoshida
    • Journal Title

      Journal of the Physical Society of Japan 78

      Pages: 074716-1-5

    • Peer Reviewed
  • [Journal Article] Elementary excitations and spin dynamics in nanowire quantum Magnets2009

    • Author(s)
      T.Sakai
    • Journal Title

      International Journal of Modern Physics C 20

      Pages: 1467-1476

    • Peer Reviewed
  • [Journal Article] Quantum Phase Transition of a Triangular Lattice Spin Tube and Edge Spin Effects2009

    • Author(s)
      K.Okunishi
    • Journal Title

      International Journal of Modern Physics C 20

      Pages: 1423-1430

    • Peer Reviewed
  • [Presentation] スピンチューブの磁化プラトーにおけるスタガード磁化, ダイマー及びカイラル秩序の共存2010

    • Author(s)
      坂井徹
    • Organizer
      日本物理学会第65回年次大会
    • Place of Presentation
      岡山
    • Year and Date
      2010-03-21
  • [Presentation] Field-induced quantum phase transitions of the asymmetric three-leg spin tube2010

    • Author(s)
      坂井徹
    • Organizer
      American Physical Society March Meeting
    • Place of Presentation
      Portland
    • Year and Date
      2010-03-16
  • [Presentation] スピンナノチューブのカイラリティ2010

    • Author(s)
      坂井徹
    • Organizer
      CMRC研究会「相関電子と構造物性」
    • Place of Presentation
      筑波
    • Year and Date
      2010-02-22
  • [Presentation] カゴメ格子反強磁性体の磁気ダイナミクス2010

    • Author(s)
      坂井徹
    • Organizer
      古典及び量子系のダイナミクス・非平衡統計力学に関するワークショップ
    • Place of Presentation
      東京
    • Year and Date
      2010-02-14
  • [Presentation] カゴメ格子反強磁性体の磁化過程2009

    • Author(s)
      坂井徹
    • Organizer
      東大物性研短期研究会「計算物理学」
    • Place of Presentation
      柏
    • Year and Date
      2009-12-10
  • [Presentation] Magnetization process of the S=1/2 distorted diamond spin chain2009

    • Author(s)
      坂井徹
    • Organizer
      International Symposium : High Magnetic Field Spin Science in 100T
    • Place of Presentation
      Sendai
    • Year and Date
      2009-12-08
  • [Presentation] Selection Rules for ESR Direct Transition of the Spin Gap and their Applications2009

    • Author(s)
      坂井徹
    • Organizer
      Electron Magnetic Resonance of Strongly Correlated Spin Systems
    • Place of Presentation
      Kobe
    • Year and Date
      2009-11-09
  • [Presentation] Quantum Phase Transition of the 3-Leg Spin Tube2009

    • Author(s)
      坂井徹
    • Organizer
      International Workshop on Dynamics and Manipulation of Quantum Systems
    • Place of Presentation
      Tokyo
    • Year and Date
      2009-10-14
  • [Presentation] ジャロシンスキー・守谷相互作用のある歪んだダイヤモンド鎖の磁化過程2009

    • Author(s)
      坂井徹
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      熊本
    • Year and Date
      2009-09-26
  • [Presentation] 三本鎖スピンチューブの3分の1磁化プラトー2009

    • Author(s)
      坂井徹
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      熊本
    • Year and Date
      2009-09-26
  • [Presentation] 異方的スピンラダー系の磁場誘起スピンネマティック相2009

    • Author(s)
      坂井徹
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      熊本
    • Year and Date
      2009-09-25
  • [Presentation] Magnetic field induced phenomena in quasi-one-dimensional organic magnets2009

    • Author(s)
      坂井徹
    • Organizer
      International Workshop on "Theories on Strongly Correlated Molecular Conductors"
    • Place of Presentation
      Narita
    • Year and Date
      2009-09-18
  • [Presentation] Numerical Exact Diagonalization Study on a Phonon-Assisted Hole Paring in the High-Tc Cuprates2009

    • Author(s)
      坂井徹
    • Organizer
      International Conference on Materials and Mechanisms of Superconductivity
    • Place of Presentation
      Tokyo
    • Year and Date
      2009-09-08
  • [Presentation] Field-Induced Nematic Phase in the Spin Ladder System with Easy-Axis Anisotropy2009

    • Author(s)
      坂井徹
    • Organizer
      International Conference on Quantum Criticality and Novel Phases
    • Place of Presentation
      Dresden
    • Year and Date
      2009-08-03
  • [Presentation] Magnetization Process of the S=1/2 Distorted Diamond Spin Chain with the Dzyaloshinsky-Moriya interaction2009

    • Author(s)
      坂井徹
    • Organizer
      International Conference on Magnetism(ICM)
    • Place of Presentation
      Karlsruhe
    • Year and Date
      2009-07-30
  • [Presentation] Field Induced Exotic Phenomena of the S=1/2 Three-Leg Quantum Spin Nanotube2009

    • Author(s)
      坂井徹
    • Organizer
      International Symposium on Research in High Magnetic Field
    • Place of Presentation
      Dresden
    • Year and Date
      2009-07-23
  • [Presentation] Quantum Phase Transitions of the Three-Leg Spin Tube2009

    • Author(s)
      坂井徹
    • Organizer
      oint European Japanese Conference : Frustration in Condensed Matter
    • Place of Presentation
      Lyon
    • Year and Date
      2009-05-13
  • [Remarks]

    • URL

      http://cmt.spring8.or.jp/

URL: 

Published: 2011-06-16   Modified: 2016-04-21  

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