Study of topological order and detection of edge statein the spin liquid state realized in an organic material

• Project/Area Number: 23684025
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: ITOU Tetsuaki 東京大学, 大学院・工学系研究科, 講師 (50402748)
• Project Period (FY): 2011 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥29,640,000 (Direct Cost: ¥22,800,000、Indirect Cost: ¥6,840,000); Fiscal Year 2012: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000); Fiscal Year 2011: ¥21,710,000 (Direct Cost: ¥16,700,000、Indirect Cost: ¥5,010,000)
• Keywords: 分子性固体・有機導体 / スピン液体

Research Abstract

I have confirmed that the organic triangular-lattice system EtMe_3Sb[Pd(dmit)_2]_2 has an spin-liquid ground state without antiferromagnetic ordering. The temperature dependence of the spin-lattice relaxation rate suggests that the spin state of this system undergoes an abrupt change at around 1 K. Although some theories had predicted that such an instability is accompanied by topological ordering, I have reached a conclusion that topological ordering is not likely to be realized in this system.
I have also clarified the electronic states which appear when this spin liquid state is destroyed by substituting the counter cation or applying pressure.

Research Products

• [Journal Article] Nuclear magnetic resonance of the inequivalent carbon atoms in the organic spin-liquid material EtMe3P[Pd(dmit)_2]_2 (2011)
  • Author(s): T. Itou, K. Yamashita, M. Nishiyama, A .Oyamada, S. Maegawa, K. Kubo and R. Kato
  • Journal Title: Phys.Rev.B Volume: Vol.84 Issue: 9 Pages: 94405-94405
  • DOI: 10.1103/physrevb.84.094405
  • Peer Reviewed
• [Journal Article] Ground state of the organic spin-liquid material EtMe_3P[Pd(dmit)_2]_2 (2011)
  • Author(s): T. Itou, A. Oyamada, S. Maegawa and R. Kato
  • Journal Title: J.of Phys. : Conf.Ser. Volume: Vol.320 Pages: 1-5
  • DOI: 10.1088/1742-6596/320/1/012033
  • Peer Reviewed
• [Journal Article] NMR study of quantum spin liquid and its phase transition in the organic spin 1/2 triangular lattice antiferromagnet EtMe_3P[Pd(dmit)_2]_2 (2011)
  • Author(s): S. Maegawa, T. Itou, A. Oyamada and R. Kato
  • Journal Title: J.of Phys : Conf.Ser. Volume: Vol.320 Pages: 1-6
  • DOI: 10.1088/1742-6596/320/1/012032
  • Peer Reviewed
• [Presentation] 量子スピン液体物質EtMe_3Sb[Pd(dmit)_2]_2の圧力下13^C-NMR (2013)
  • Author(s): 渡辺恵里
  • Organizer: 日本物理学会第68回年次大会
  • Place of Presentation: 広島大学(広島県)
  • Year and Date: 2013-03-28
• [Presentation] Spin liquid, superconductivity, and Mott transition observed in the triangular-lattice organic system X[Pd(dmit)_2]_2 (2013)
  • Author(s): T.Itou
  • Organizer: QS2C Theory Forum: International Symposium on "Strongly Correlated Quantum Science"
  • Place of Presentation: University of Tokyo (Tokyo,Japan)
  • Year and Date: 2013-01-27
• [Presentation] Spin liquid state in EtMe3Sb[Pd(dmit)_2]_2 (2012)
  • Author(s): T. Itou
  • Organizer: studied by <13>^C-NMR measurementsTokyo workshop on spin/charge liquids near ordering
  • Place of Presentation: University of Tokyo (Tokyo, Japan)
  • Year and Date: 2012-11-29
• [Presentation] Quantum Spin Liquid State in the Triangular-Lattice Mott Insulator (2012)
  • Author(s): T. Itou
  • Organizer: Observed by <13>^C-NMR International Conference on Science and Technology of Synthetic Metals 2012
  • Place of Presentation: The Hyatt Regency Atlanta (Atlanta,America)
  • Year and Date: 2012-07-09
• [Presentation] Low energy magnetic excitation in the organic spin liquid material EtMe_3Sb[Pd(dmit)_2]_2 (2012)
  • Author(s): T. Itou
  • Organizer: observed by <13>^C-NMR International Conference on Highly Frustrated Magnetism 2012
  • Place of Presentation: McMaster University (Hamilton, Canada)
  • Year and Date: 2012-06-06
• [Presentation] 二次元面平行ないし面垂直の印加磁場下におけるEtMe_3Sb[Pd(dmit)_2]_2の単結晶13C-NMR (2012)
  • Author(s): 伊藤哲明
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学(兵庫県)
  • Year and Date: 2012-03-24
• [Presentation] (Me_4Sb)_x(EtMe_3Sb)_1-x[Pd(dmit)_2]_2混晶系の13^C-NMR (2012)
  • Author(s): 渡辺恵里
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学(兵庫県)
  • Year and Date: 2012-03-24
• [Presentation] NMRによるフラストレート三角格子X[Pd(dmit)_2]_2系における新奇磁性・超伝導の研究 (2011)
  • Author(s): 伊藤哲明
  • Organizer: 日本物理学会2011年秋季大会2011年度若手奨励賞受賞記念講演
  • Place of Presentation: 富山大学(富山)
  • Year and Date: 2011-09-23
• [Presentation] NMRによるフラストレート三角格子X[Pd(dmit)_2]_2系における新奇磁性・超伝導の研究 (2011)
  • Author(s): 伊藤哲明
  • Organizer: 研究会:金属dmit錯体による磁性・伝導性研究の最前
  • Place of Presentation: 理化学研究所(埼玉)
  • Year and Date: 2011-05-13
• [Presentation] 量子スピン液体物質EtMe3Sb[Pd(dmit)2]2の圧力下13C-NMR
  • Author(s): 渡辺恵里
  • Organizer: 日本物理学会 第68回年次大会
  • Place of Presentation: 広島大学（広島県）
• [Presentation] Spin liquid, superconductivity, and Mott transition observed in the triangular-lattice organic system X[Pd(dmit)2]2
  • Author(s): T. Itou
  • Organizer: QS2C Theory Forum: International Symposium on “Strongly Correlated Quantum Science”
  • Place of Presentation: University of Tokyo (Tokyo, Japan)
• [Presentation] Spin liquid state in EtMe3Sb[Pd(dmit)2]2 studied by 13C-NMR measurements
  • Author(s): T. Itou
  • Organizer: Tokyo workshop on spin/charge liquids near ordering
  • Place of Presentation: University of Tokyo (Tokyo, Japan)
  • Invited
• [Presentation] Quantum Spin Liquid State in the Triangular-Lattice Mott Insulator EtMe3Sb[Pd(dmit)2]2 Observed by 13C-NMR
  • Author(s): T. Itou
  • Organizer: International Conference on Science and Technology of Synthetic Metals 2012
  • Place of Presentation: The Hyatt Regency Atlanta (Atlanta, America)
• [Presentation] Low energy magnetic excitation in the organic spin liquid material EtMe3Sb[Pd(dmit)2]2 observed by 13C-NMR
  • Author(s): T. Itou
  • Organizer: International Conference on Highly Frustrated Magnetism 2012
  • Place of Presentation: McMaster University (Hamilton, Canada)
• [Presentation] 二次元面平行ないし面垂直の印加磁場下におけるEtMe3Sb[Pd(dmit)2]2の単結晶13C-NMR
  • Author(s): 伊藤哲明
  • Organizer: 日本物理学会 第67回年次大会
  • Place of Presentation: 関西学院大学 (兵庫県）
• [Presentation] (Me4Sb)x(EtMe3Sb)1-x[Pd(dmit)2]2混晶系の13C-NMR
  • Author(s): 渡辺恵里
  • Organizer: 日本物理学会 第67回年次大会
  • Place of Presentation: 関西学院大学 (兵庫県）
• [Presentation] NMRによるフラストレート三角格子X[Pd(dmit)2]2系における新奇磁性・超伝導の研究
  • Author(s): 伊藤哲明
  • Organizer: 日本物理学会 2011年秋季大会 2011年度若手奨励賞受賞記念講演
  • Place of Presentation: 富山大学 (富山）
  • Invited
• [Presentation] NMRによるフラストレート三角格子X[Pd(dmit)2]2系における新奇磁性・超伝導の研究
  • Author(s): 伊藤哲明
  • Organizer: 研究会：金属 dmit 錯体による磁性・伝導性研究の最前線
  • Place of Presentation: 理化学研究所 (埼玉）
• [Remarks] 相関環境学専攻の伊藤哲明助教が第5回（2011年）日本物理学会若手奨励賞を受賞
  • URL: http://www.h.kyoto-u.ac.jp/jinkan/topics/2011/04/52011.php