Quantum Spin Liquid State in Spin-1/2 Kagome Copper Minerals

2010 Fiscal Year Final Research Report

• Project/Area Number: 21740246
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: OKAMOTO Yoshihiko The University of Tokyo, 物性研究所, 助教 (90435636)
• Project Period (FY): 2009 – 2010
• Keywords: スピン液体 / 幾何学的フラストレーション / カゴメ格子 / 銅鉱物 / 量子スピン

Research Abstract

High quality samples of volborthite and vesignieite were synthesized and physical properties of them were measured to clarify the nature of the quantum spin liquid state, which is expected to appear in a spin-1/2 kagome antiferromagnet. We find that vesignieite is a strong candidate to have the spin liquid ground state, and both compounds show anomalous magnetization plateau in their magnetization curves.

Research Products

• [Journal Article] Magnetization Plateaus of Spin-1/2 Kagome Antiferromagnets Volborthite and Vesignieite (2011)
  • Author(s): Y.Okamoto, M.Tokunaga, H.Yoshida, A.Matsuo, K.Kindo, Z.Hiroi
  • Journal Title: Physical Review B 83 Pages: 180407(1-4)
  • Peer Reviewed
• [Journal Article] Thermodynamic Properties of the Kagome Lattice in Volborthite (2010)
  • Author(s): S.Yamashita, T.Moriura, Y.Nakazawa, H.Yoshida, Y.Okamoto, Z.Hiroi
  • Journal Title: Journal of Physical Society of Japan 79 Pages: 083710(1-4)
  • Peer Reviewed
• [Journal Article] High-Field ESR Measurements of S=1/2 Kagome Lattice Antiferromagnet BaCu_3V_2O_8(OH))_2 (2010)
  • Author(s): W.Zhang, H.Ohta, S.Okubo, M.Fujisawa, T.Sakurai, Y.Okamoto, H.Yoshida, Z.Hiroi
  • Journal Title: Journal of Physical Society of Japan 79 Pages: 023708(1-4)
  • Peer Reviewed
• [Journal Article] Spin dynamics of S=1/2 kagome lattice antiferromagnets observed by high-field ESR (2010)
  • Author(s): H.Ohta, W.Zhang, S.Okubo, M.Fujisawa, T.Sakurai, Y.Okamoto, H.Yoshida, Z.Hiroi
  • Journal Title: Physica Status Solidi B 247 Pages: 679-681
  • Peer Reviewed
• [Journal Article] Phase Diagram and Spin Dynamics in Volborthite with a Distorted Kagome Lattice (2009)
  • Author(s): M.Yoshida, M.Takigawa, H.Yoshida, Y.Okamoto, Z.Hiroi
  • Journal Title: Physical Review Letters 103 Pages: 077207(1-4)
  • Peer Reviewed
• [Journal Article] Magnetization "Steps" on a Kagome Lattice in Volborthite (2009)
  • Author(s): H.Yoshida, Y.Okamoto, T.Tayama, T.Sakakibara, M.Tokunaga, A.Matsuo, Y.Narumi, K.Kindo, M.Yoshida, M.Takigawa, Z.Hiroi
  • Journal Title: Journal of Physical Society of Japan 78 Pages: 043704(1-4)
  • Peer Reviewed
• [Journal Article] Vesignieite BaCu_3V_2O_8(OH)_2 as a Candidate Spin-1/2 Kagome Antiferromagnet (2009)
  • Author(s): Y.Okamoto, H.Yoshida, Z.Hiroi
  • Journal Title: Journal of Physical Society of Japan 78 Pages: 033701(1-4)
  • Peer Reviewed
• [Journal Article] S=1/2 kagome lattice antiferromagnet Cu_3V_2O_7(OH)_2・2H_2O studied by high field ESR (2009)
  • Author(s): H.Ohta, W.Zhang, S.Okubo, M.Tomoo, M.Fujisawa, H.Yoshida, Y.Okamoto, Z.Hiroi
  • Journal Title: Journal of Physics : Conference Series 145 Pages: 012010(1-4)
  • Peer Reviewed
• [Journal Article] Spin-1/2 kagome compounds : volborthite vs herbertsmithite (2009)
  • Author(s): Z.Hiroi, H.Yoshida, Y.Okamoto, M.Takigawa
  • Journal Title: Journal of Physics : Conference Series 145 Pages: 012002(1-8)
  • Peer Reviewed
• [Journal Article] カゴメ格子上に配列したスピン:銅鉱物ベシニエ石 (2009)
  • Author(s): 岡本佳比古, 広井善二
  • Journal Title: 固体物理 44 Pages: 473-480
• [Presentation] スピン1/2カゴメ格子反強磁性体BaCu_3V_2O_8(OH)_2(vesignieite)の比熱 (2011)
  • Author(s): 岡本佳比古, 広井善二
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学
  • Year and Date: 2011-03-25
• [Presentation] Magnetization Plateaus in Spin-1/2 Kagome Antiferromagnets, Volborthite and Vesignieite (2011)
  • Author(s): Y.Okamoto, H.Yoshida, M.Tokunaga, Z.Hiroi
  • Organizer: International Conference on Frustration in Condensed Matter
  • Place of Presentation: 仙台国際センター
  • Year and Date: 2011-01-11
• [Presentation] スピン1/2カゴメ格子反強磁性体の銅鉱物の強磁場磁化過程 (2010)
  • Author(s): 岡本佳比古, 徳永将史, 吉田紘行, 広井善二
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-21
• [Presentation] スピン1/2カゴメ格子磁性体の物質探索 (2010)
  • Author(s): 岡本佳比古
  • Organizer: 第36回化合物新磁性研究会
  • Place of Presentation: 早稲田大学
  • Year and Date: 2010-01-28
• [Presentation] スピン1/2カゴメ格子反強磁性体volborthiteとvesignieiteの強磁場磁化過程 (2010)
  • Author(s): 岡本佳比古, 徳永将史, 吉田紘行, 広井善二
  • Organizer: 特定領域研究「フラストレーションが創る新しい物性」成果報告会
  • Place of Presentation: 京都大学
  • Year and Date: 2010-01-08
• [Presentation] スピン1/2カゴメ格子反強磁性体BaCu_3V_2O_8(OH)_2の磁性II (2009)
  • Author(s): 岡本佳比古, 徳永将史, 吉田紘行, 広井善二
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-27
• [Presentation] スピン1/2カゴメ格子反強磁性体CdCu_3(OH)_6(NO_3)_2・H_2Oの磁性 (2009)
  • Author(s): 岡本佳比古, 広井善二
  • Organizer: 日本物理学会2009年秋季大会
  • Place of Presentation: 熊本大学
  • Year and Date: 2009-09-25
• [Presentation] Vesignieite BaCu_3V_2O_8(OH)_2 as a candidate spin-1/2 kagome antiferromagnet (2009)
  • Author(s): Y.Okamoto, H.Yoshida, Z.Hiroi
  • Place of Presentation: Karlsruhe 市(ドイツ)
  • Year and Date: 2009-07-30
• [Remarks] ホームページ等
  • URL: http://yoshihikookamoto.web.fc2.com/