Low-Temperature Magnetic Relaxation of the Spin Ice Compounds

• Project/Area Number: 18340101
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Kyoto University
• Principal Investigator: MAENO Yoshiteru Kyoto University, 大学院・理学研究科, 教授 (80181600)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥16,480,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥1,080,000); Fiscal Year 2008: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2007: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2006: ¥11,800,000 (Direct Cost: ¥11,800,000)
• Keywords: スピンアイス / フラストレーション / パイロクロア酸化物 / 磁気緩和 / 核磁気共鳴

Research Abstract

結晶構造の幾何学的特性のために、低温でも大きなエントロピーが残る「幾何学的にフラストレートした磁性体」の典型例が、「スピンアイス」の現象を示すパイロクロア酸化物である.スピンアイスの残留エントロピー状態の本性を明確にすることを目的に、純良単結晶を用いて低温までの磁気緩和を研究した.その結果、磁気誘電応答、磁化、核磁気共鳴などによって、低温でも磁気緩和が強く残ることを明らかにした.また金属スピンアイスや金属三角格子など関連のフラストレート磁性体の物性も開拓した.

Research Products

• [Journal Article] Critical behavior of the metallic triangular-lattice Heisenberg antiferromagnet PdCrO_2 (2009)
  • Author(s): H. Takatsu, H. Yoshizawa, S. Yonezawa and Y. Maeno
  • Journal Title: Physical Review B 79 (10)
  • Peer Reviewed
• [Journal Article] Critical behavior of the metallic triangular-lattice Heisenberg antiferromagnet PdCrO2 (2009)
  • Author(s): H. Takatsu, H. Yoshizawa, S. Yonezawa, Y. Maeno
  • Journal Title: Physical Review B 79(10)
  • Peer Reviewed
• [Journal Article] High-temperature spin relaxation process in Dy_2Ti_2O_7 probed by 47Ti-NQR (2008)
  • Author(s): K. Kitagawa, R. Higashinaka, K. Ishida, Y. Maeno and M. Takigawa
  • Journal Title: Physical Review B 77 (21)
  • Peer Reviewed
• [Journal Article] Spin dynamics and spin freezing behavior in the two-dimensional antiferromagnet NiGa_2S_4 revealed by Ga-NMR, NQR and μSR measurements (2008)
  • Author(s): H. Takeya, K. Ishida, K. Kitagawa, Y. Ihara, K. Onuma, Y. Maeno, Y. Nambu, S. Nakatsuji, D. E. MacLaughlin, A. Koda and R. Kadono
  • Journal Title: Physical Review B 77 (5)
  • Peer Reviewed
• [Journal Article] High-temperature spin relaxation process in Dy2Ti207 probed by 47Ti-NQR (2008)
  • Author(s): K. Kitagawa, R. Higashinaka, K. Ishida, Y. Maeno, M. Takieawa
  • Journal Title: Physical Review B 77(21)
  • Peer Reviewed
• [Journal Article] Spin dynamics and spin freezing behavior in the two-dimensional antiferromagnet NiGa2S4 revealed by Ga-NMR, NQR and μ SR measurements (2008)
  • Author(s): H. Takeya, K. Ishida, K. Kitagawa, Y. Ihara, K. Onuma, Y. Maeno, Y. Nambu, S. Nakatsuji, D. E. MacLaughlin, A. Koda and R. Kadono
  • Journal Title: Physycal Review B 77(5)
  • Peer Reviewed
• [Journal Article] Relaxation in the spin ice Dy_2Ti_2O_7 studied using nuclear forward scattering (2007)
  • Author(s): J. P. Sutter, S. Tsutsui, R. Higashinaka, Y. Maeno, O. Leupold, A. Q. R. Baron
  • Journal Title: Physical Review B 75
  • Peer Reviewed
• [Journal Article] Crystal growth and structure of R_2Ir_2O_7 (R = Pr, Eu) using molten KF (2007)
  • Author(s): J. N. Millican, R. T. Macaluso, S. Nakatsuji, Y. Machida, Y. Maeno, J. Y. Chan
  • Journal Title: Materials Research Bulletin 42(5) Pages: 928-934
  • Peer Reviewed
• [Journal Article] Geometrical frustration and spin-liquid behavior of the metallic pyrochlore antiferromagnet Pr_2Ir_2O_7 (2007)
  • Author(s): Y. Machida, S. Nakatsuji, Y. Maeno, T. Tayama, T. Sakakibara
  • Journal Title: Journal of Magnetism and Magnetic Materials 310 Pages: 1328-1330
  • Peer Reviewed
• [Journal Article] Anomalous Hall effect of the frustrated Kondo lattice Pr_2Ir_2O_7 (2007)
  • Author(s): Y. Machida, S. Nakatsuji, Y. Maeno, T. Tayama, T. Sakakibara
  • Journal Title: Journal of Magnetism and Magnetic Materials 310 Pages: 1079-1081
  • Peer Reviewed
• [Journal Article] Unconventional Anomalous Hall Effect Enhanced by a Noncoplanar Spin Texture in the Frustrated Kondo Lattice Pr_2Ir_2O_7 (2007)
  • Author(s): Y. Machida, S. Nakatsuji, Y. Maeno, T. Tayama, T. Sakakibara, S. Onoda
  • Journal Title: Physical Review Letters 98(5)
  • Peer Reviewed
• [Journal Article] Relaxation in the spin ice Dy2Ti207 studied using nuclear forward scattering (2007)
  • Author(s): J. P. Sutter, S. Tsutsui, R. Higashinaka, Y. Maeno, 0. Leupold and A. Q. R. Baron
  • Journal Title: Physycal Review B 75
  • Peer Reviewed
• [Journal Article] Crystal growth and structure of R2Ir207 (R=Pr, Eu) using molten KF (2007)
  • Author(s): J. N. Millican, R. T. Macaluso, S. Nakatsuji, Y. Machida, Y. Maeno and J. Y. Chan
  • Journal Title: Materials Research Bulletin 42(5) Pages: 928-934
  • Peer Reviewed
• [Journal Article] Unconventional Anomalous Hall Effect Enhanced by a Noncoplanar Spin Texture in the Frustrated Kondo Lattice Pr_2Ir_2O_7 (2007)
  • Author(s): Y.Machida, S.Nakatsuji, Y.Maeno, T.Tayama, T.Sakakibara, S.Onoda
  • Journal Title: Physical Review Letters 98,5
• [Journal Article] Anomalous Hall effect of the frustrated Kondo lattice Pr_2Ir_2O_7 (2007)
  • Author(s): Y.Machida, S.Nakatsuji, Y.Maeno, T.Tayama, T.Sakakibara
  • Journal Title: Journal of Magnetism and Magnetic Materials 310 Pages: 1079-1081
• [Journal Article] Geometrical frustration and spin-liquid behavior of the metallic pyrochlore antiferromagnet Pr_2Ir_2O_7 (2007)
  • Author(s): Y.Machida, S.Nakatsuji, Y.Maeno, T.Tayama, T.Sakakibara
  • Journal Title: Journal of Magnetism and Magnetic Materials 310 Pages: 1328-1330
• [Presentation] 導電性三角格子磁性体PdCrO_2の磁場中輸送特性 (2009)
  • Author(s): 高津浩
  • Organizer: 日本物理学会 第64回年次大会
  • Place of Presentation: 立教大学(東京都)
  • Year and Date: 2009-03-28
• [Presentation] 導電性三角格子磁性体PdCrO2の磁場中輸送特性 (2009)
  • Author(s): 高津浩, 前野悦輝
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-28
• [Presentation] 二次元三角格子反強磁性体NiGa_2S_4における異常なスピン凍結状態 (2008)
  • Author(s): 南部雄亮
  • Organizer: 日本物理学会、秋季大会
  • Place of Presentation: 岩手大学(盛岡市)
  • Year and Date: 2008-09-22
• [Presentation] Dy2Ti2O7スピンアイス状態における緩和機構の47Ti-NQR, 17O-NMRによる研究 (2008)
  • Author(s): 北川健太郎
  • Organizer: 日本物理学会、秋季大会
  • Place of Presentation: 岩手大学(盛岡市)
  • Year and Date: 2008-09-21
• [Presentation] 導電性層状三角格子磁性体PdCrO_2における相転移の臨界性 (2008)
  • Author(s): 高津浩
  • Organizer: 日本物理学会、秋季大会
  • Place of Presentation: 岩手大学(盛岡市)
  • Year and Date: 2008-09-21
• [Presentation] 導電性層状三角格子磁性体PdCrO2における相転移の臨界性 (2008)
  • Author(s): 高津浩, 吉沢英樹, 前野悦輝
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-21
• [Presentation] パイロクロア金属磁性体Pr_2Ir_2O_7のスピン凍結と異常ホール効果 (2008)
  • Author(s): 町田洋
  • Organizer: 日本物理学会、第63回年次大会
  • Place of Presentation: 近畿大学(東大阪市)
  • Year and Date: 2008-03-25
• [Presentation] Dy_2Ti_2O_7スピンアイス状態の47Ti-NQRによる微視的測定 (2007)
  • Author(s): 北川健太郎
  • Organizer: 日本物理学会, 第62回年次大会
  • Place of Presentation: 北海道大学(札幌市)
  • Year and Date: 2007-09-24
• [Presentation] Pr_2Ir_2O_7の極低温・高磁場下におけるホール効果 (2007)
  • Author(s): 町田洋
  • Organizer: 日本物理学会、第62回年次大会
  • Place of Presentation: 北海道大学(札幌市)
  • Year and Date: 2007-09-22
• [Presentation] 導電性Delafossite型酸化物PdMO_2 (M=Co, Cr)の低温物性と磁気的性質 (2007)
  • Author(s): 高津浩
  • Organizer: 日本物理学会、第62回年次大会
  • Place of Presentation: 北海道大学(札幌市)
  • Year and Date: 2007-09-21
• [Presentation] Unusual Spin Freezing in Triangular Antiferromagnet NiGa_2S_4 (2007)
  • Author(s): Yoshiteru Maeno
  • Organizer: Meeting of the CIFAR (Canadian Institute for Advanced Research) Quantum Materials Program
  • Place of Presentation: Lake Carling, Canada
• [Presentation] Unusual Spin Freezing in Triangular Antiferromagnet NiGa2S4 (2007)
  • Author(s): Yoshiteru Maeno
  • Organizer: Meeting of the CIFAR (Canadian Institute For Advanced Research) Quantum Materials Program
  • Place of Presentation: Lake Carling, Canada
• [Presentation] Dy_2Ti_2O_7の<47>^Ti, <17>^O-NMR/ NQRによる微視的測定 (2006)
  • Author(s): 北川健太郎
  • Organizer: 日本物理学会、秋季大会
  • Place of Presentation: 千葉大学(千葉市)
  • Year and Date: 2006-09-26
• [Presentation] パイロクロア型金属磁性体Pr_2Ir_2O_7の磁気臨界的低温状態における異常ホール効果 (2006)
  • Author(s): 町田洋
  • Organizer: 日本物理学会、秋季大会
  • Place of Presentation: 千葉大学(千葉市)
  • Year and Date: 2006-09-25