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2008 Fiscal Year Self-evaluation Report

Competition and cooperation between the bond change and the frustration in low dimensional quantum spin systems

Research Project

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Project/Area Number 18540340
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Condensed matter physics II
Research InstitutionTokyo Institute of Technology

Principal Investigator

OKAMOTO Kiyomi  Tokyo Institute of Technology, 大学院・理工学研究科, 助教 (10114860)

Project Period (FY) 2006 – 2009
Keywords量子スピン / 低次元 / 量子相転移 / フラストレーション / 磁性
Research Abstract

本研究の主要な目的は, 低次元反強磁性量子スピン系において, 空間的格子構造に起因するボンドの変化とフラストレーションの相乗効果を理論的(解析的および数値的)に調べることにある. 量子スピンのHeisenbergモデルにおいて, 微妙な格子構造の変化が, 例えばボンド交代(bond alternation あるいはbond dimerization)や3量体的スピン相互作用(trimerization), などのボンド変化や, 相互作用のフラストレーションをもたらす. 以上のような状況に鑑み, ボンド変化とフラストレーションの競合と協力を種々のモデルで調べ, 実在物質の磁気的性質の解明, あるいは物質合成や探索の指針を与える.

  • Research Products

    (6 results)

All 2009 2008 2007

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

  • [Journal Article] Quantum phase transitions of the asymmetric three-leg spin tube2008

    • Author(s)
      T. Sakai, M. Sato, K. Okunishi, Y. Otsuka, K. Okamoto and C. Itoi
    • Journal Title

      Phys.Rev.B 78

      Pages: 184415-1-11

    • Peer Reviewed
  • [Journal Article] One-Third Magnetization Plateau in an Anisotropic(S, S')=(1, 2)Spin-Alternating Chain2007

    • Author(s)
      T. Tonegawa, T. Sakai, K. Okamoto and M. Kaburagi
    • Journal Title

      J. Phys. Soc. Jpn 76

      Pages: 124701-1-8

    • Peer Reviewed
  • [Journal Article] Quantum Spin Flop Transition in Nanowire Ferrimagnets2007

    • Author(s)
      T. Sakai, K. Okamoto and T. Tonegawa
    • Journal Title

      Physica E 40

      Pages: 359-362

    • Peer Reviewed
  • [Presentation] スピンナノチューブ : 最近の理論的発展2009

    • Author(s)
      坂井徹, 佐藤正寛, 奥西巧一, 大塚雄一, 岡本清美, 糸井千岳
    • Organizer
      日本物理学会2009年年次大会
    • Place of Presentation
      立教大学池袋キャンパス
    • Year and Date
      2009-03-28
  • [Presentation] Half Magnetization Plateau in a Frustrated S=1 Antiferromagntic Chain2009

    • Author(s)
      T. Tonegawa, H. Nakano, T. Sakai and K. Okamoto
    • Organizer
      4th JAEA Synchrotron Radiation Research Symposium : X-Ray and High Magnetic Field
    • Year and Date
      2009-03-06
  • [Presentation] Anomalous Temperature Dependence of the Magnetic Susceptibility and the Specific Heat of a Spin Gapped Chain with Randomness in Magnetic Field2008

    • Author(s)
      K. Okamoto
    • Organizer
      Topological Aspects of Solid State Physics : Symposium
    • Place of Presentation
      Yukawa Institute for Theoretical Physics, Kyoto University
    • Year and Date
      2008-06-24

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Published: 2010-06-11   Modified: 2016-04-21  

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