Quantum Frustration

2009 Fiscal Year Self-evaluation Report

• Project Area: Novel States of Matter Induced by Frustration
• Project/Area Number: 19052004
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyoto University
• Principal Investigator: KAGEYAMA Hiroshi Kyoto University, 大学院・工学研究科, 教授 (40302640)
• Project Period (FY): 2007 – 2011
• Keywords: 量子スピン / フラストレーション

Research Abstract

低次元量子スピン系は,低次元性と量子揺らぎの効果により,古典スピン系とは全く異なる異常量子物性が現れることが期待される.本課題では,新物質開拓によって,二次元系を中心に「量子効果」が「フラストレーション」と相まって増強された特異な揺らぎや量子臨界性がつくりだす新奇物性を見出し、統一的な理解を得ることを目指す.

Research Products

• [Journal Article] 新しい幾何学的フラストレーション系のデザイン (2009)
  • Author(s): 陰山洋
  • Journal Title: トポロジーデザイニング Pages: 283-296
• [Journal Article] Spin Transition in a Four-Coordinate Iron Oxide (2009)
  • Author(s): 川上隆輝, 辻本吉廣, 陰山洋, Xing-Qiu Chen, C.L. Fu, C. Tassel, 北田敦, S. Suto, K. Hirama, Y. Sekiya, Y. Makino, 岡田卓, 八木健彦, 林直顕, 吉村一良, 那須三郎, R. Podloucky, 高野幹夫
  • Journal Title: Nature Chemistry 1 Pages: 371-376
  • Peer Reviewed
• [Journal Article] Quantum phase transition in (CuCl)La(NbTa)O (2009)
  • Author(s): 北田敦, 辻本吉廣, 陰山洋, 網代芳民, 西正和, 鳴海康雄, 金道浩一, 市原正樹, 上田寛, Y.J. Uemura, 吉村一良
  • Journal Title: Phys. Rev. B 80 Pages: 174409(1-5)
  • Peer Reviewed
• [Journal Article] Spin dimers in the quantum ferrimagnet CuFeGeO under staggered and random magnetic field (2009)
  • Author(s): 益田隆嗣, 加倉井和久, A. Zheludev
  • Journal Title: Phys. Rev. B 80(18) Pages: 180412(R)/1-4
  • Peer Reviewed
• [Journal Article] 酸素分子により設計された磁性体における中性子散乱 (2009)
  • Author(s): 益田隆嗣
  • Journal Title: 固体物理 44(7) Pages: 463-472
• [Journal Article] Pressure-Enhanced Direct Exchange Couplings in Chromium Spinels (2008)
  • Author(s): 植田浩明, 上田寛
  • Journal Title: Phys. Rev. B77 22 Pages: 224411/1-6
  • Peer Reviewed
• [Journal Article] NMR Evidence for the Persistence of a Spin Superlattice Beyond the 1/8 Magnetization Plateau in SrCu2(BO3)2 (2008)
  • Author(s): 瀧川仁, 松原信一, M. Horvatic, C. Berthier, 陰山洋, 上田寛
  • Journal Title: Phys. Rev. Lett. 101(3) Pages: 037202/1-4
  • Peer Reviewed
• [Journal Article] Infinite-layer iron oxide with a square-planar coordination (2007)
  • Author(s): 辻本吉廣, C. Tassel, 林直顕, 渡邉貴志, 陰山洋, 吉村一良, 高野幹夫, M. Ceretti, C. Ritter, W. Paulus
  • Journal Title: Nature 450 Pages: 1062-1065
  • Peer Reviewed
• [Journal Article] (2007)
  • Author(s): 三田村裕之, 植田浩明, 香取浩子, 榊原俊郎, 上田寛, 高木英典
  • Journal Title: J. Phys. Soc. Jpn. 76 Pages: 085001/1-2
  • Peer Reviewed
• [Presentation] Monte Carlo Approach to Phase Transitions in Quantum Systems (2009)
  • Author(s): 川島直輝
  • Organizer: International Workshop on Statistical-Mechanical Informatics
  • Place of Presentation: 仙台
  • Year and Date: 2009-09-16
• [Presentation] Spin dynamics in artificially designed oxygen molecule magnet (2009)
  • Author(s): 益田隆嗣
  • Organizer: 国際磁性会議2009(ICM2009)
  • Place of Presentation: カールスルーエコングレスセンター(ドイツカールスルーエ)
  • Year and Date: 2009-07-31
• [Presentation] Structural Control of Perovskite Oxides by a Gentle Touch Symposium on Materials For Frustrated Magnetism (MFFM) Grenoble (2009)
  • Author(s): 陰山洋
  • Place of Presentation: フランス
  • Year and Date: 2009-03-05
• [Presentation] μSR Studies of Quantum Phase Transitions in the S=1/2 Frustrated Square Lattice Cu(Cl, Br)La(Nb, Ta)O7 (2008)
  • Author(s): 陰山洋
  • Organizer: 11th International Conference on Muon SpinResonance, Relaxation, and Resonance (μSR2008)
  • Place of Presentation: つくば市
  • Year and Date: 2008-07-24
• [Presentation] Ground States of SU(N)Heisenberg Model (2008)
  • Author(s): 川島直輝
  • Organizer: International Workshop on Topological Aspects of Solid State Physics
  • Place of Presentation: 京都府
  • Year and Date: 2008-06-21