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Effects of randomness and frustration on quantum spin systems with lattice distortion

Research Project

Project/Area Number 18740239
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Mathematical physics/Fundamental condensed matter physics
Research InstitutionUniversity of the Ryukyus (2007-2008)
Aoyama Gakuin University (2006)

Principal Investigator

YASUDA Chitoshi  University of the Ryukyus, 理学部, 准教授 (20398564)

Project Period (FY) 2007 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥1,750,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥150,000)
Fiscal Year 2008: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2007: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
Keywords計算物理 / 磁性 / 物性理論 / 統計力学 / 物性基礎論
Research Abstract

スピン・パイエルス物質で観測されている「不純物誘起反強磁性長距離秩序」のメカニズムを調べた。量子力学的に非磁性な系をボンド希釈すると、ダイマーが壊れ、抜いたボンドの両端に有効スピンが誘起する。それらの有効スピン間には二種類の有効相互作用が競合して存在し、それらの相互作用の強さが同等になるまで反強磁性長距離秩序が誘起されないことを明らかにした。さらに、格子の自由度を考慮した系では、格子エネルギーの利得のため格子歪みの最適化がなされ、有効スピンが不純物近傍に誘起される場合と不純物間中央に誘起される場合があることを明らかにした。

Report

(4 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • Research Products

    (15 results)

All 2009 2008 2007 2006 Other

All Journal Article (6 results) (of which Peer Reviewed: 4 results) Presentation (6 results) Remarks (3 results)

  • [Journal Article] Six-Sublattice Structure of the Multiple-Spin Exchange Model on the Triangular Lattice in the Magnetic Field2007

    • Author(s)
      Chitoshi Yasuda, Yuma Uchihira, and Kenn Kubo
    • Journal Title

      Journal of Magnetism and Magnetic Materials 310

      Pages: 1285-1287

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Six-Sublattice Structure of the Multiple-Spin Exchange Model on the Trianglular Lattice in the Magnetic Field2007

    • Author(s)
      Chitoshi Yasuda
    • Journal Title

      Journal of Magnetism and Magnetic Materials 310

      Pages: 1285-1287

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Bond-Dilution-Induced Quantum Phase Transition in Heisenberg Antiferromagnets2006

    • Author(s)
      Chitoshi Yasuda, Synge Todo, and Hajime Takayama
    • Journal Title

      Journal of the Physical Society of Japan 75

      Pages: 1-7

    • NAID

      110005716692

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Spin-Wave Theory of the Multiple-Spin Exchange Model on a Triangular Lattice in a Magnetic Field2006

    • Author(s)
      Chitoshi Yasuda, Daisuke Kinouchi, and Kenn Kubo
    • Journal Title

      Journal of the Physical Society of Japan 75

      Pages: 1-8

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Bond-Dilution-Induced Quantum Phase Transition in Heisenberg Antiferromagnets2006

    • Author(s)
      Chitoshi Yasuda
    • Journal Title

      Journal of the Physical Society of Japan 75 ・ 12

    • NAID

      110005716692

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Spin-Wave Theory of the Multiple-Spin Exchange Model on a Triangular Lattice in a Magnetic Field2006

    • Author(s)
      Chitoshi Yasuda
    • Journal Title

      Journal of the Physical Society of Japan 75 ・ 10

    • Related Report
      2006 Annual Research Report
  • [Presentation] 2次元スピンパイエルス系におけるサイト希釈効果2009

    • Author(s)
      安田千寿
    • Organizer
      日本物理学会第64回年次大会
    • Place of Presentation
      立教学院
    • Year and Date
      2009-03-30
    • Related Report
      2008 Final Research Report
  • [Presentation] 2次元スピンパイエルス系におけるサイト希釈効果2009

    • Author(s)
      安田千寿
    • Organizer
      同本物理学会第64回年次大会
    • Place of Presentation
      立教学院(東京)
    • Year and Date
      2009-03-30
    • Related Report
      2008 Annual Research Report
  • [Presentation] 格子の自由度と結合した量子スピン系の解析2008

    • Author(s)
      安田千寿
    • Organizer
      日本物理学会2008年秋季大会
    • Place of Presentation
      岩手大学
    • Year and Date
      2008-09-23
    • Related Report
      2008 Final Research Report
  • [Presentation] 格子の自由度と結合した風子スピン系の解析2008

    • Author(s)
      安田千寿
    • Organizer
      日本物理学会2008年秋季大会
    • Place of Presentation
      岩手大学(岩手)
    • Year and Date
      2008-09-23
    • Related Report
      2008 Annual Research Report
  • [Presentation] 不純物誘起反強磁性秩序:ボンド希釈系における競合する二つの有効相互作用2006

    • Author(s)
      安田千寿
    • Organizer
      物性研短期研究会「量子スピン系の物理」
    • Place of Presentation
      東京大学物性研究所
    • Year and Date
      2006-11-29
    • Related Report
      2008 Final Research Report
  • [Presentation] Bond-Dilution-Induced Quantum Phase Transition in Heisenberg Antiferromagnets2006

    • Author(s)
      Chitoshi Yasuda
    • Organizer
      ISSP International Workshop and Symposium on Computational Approaches to Quantum Critical Phenomena
    • Place of Presentation
      Kashiwa, Japan
    • Year and Date
      2006-08-09
    • Related Report
      2008 Final Research Report
  • [Remarks]

    • URL

      http://www.phys.u-ryukyu.ac.jp/~cyasuda

    • Related Report
      2008 Final Research Report
  • [Remarks]

    • URL

      http://www.phys.u-ryukyu.ac.jp/~cyasuda/

    • Related Report
      2008 Annual Research Report
  • [Remarks]

    • URL

      http://www.phys.u-ryukyu.ac.jp/~cyasuda/

    • Related Report
      2007 Annual Research Report

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Published: 2006-04-01   Modified: 2016-04-21  

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