Quantum criticality of one-dimensional quantum magnets at ultralow temperatures and high magnetic fields

• Project/Area Number: 20540352
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Kanazawa University
• Principal Investigator: TSUJII Hiroyuki Kanazawa University, 学校教育系, 准教授 (10392036)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2008: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 磁性 / 物性実験 / 低温物性 / 量子スピン系 / 量子臨界現象

Research Abstract

Phase transitions and critical phenomena near the quantum critical point of one-dimensional quantum magnets have been investigated by means of specific-heat, magnetocaloric-effect, and magnetic-torque measurements. We have determined phase diagrams of a ladder antiferromagnet and an Ising-like linear-chain antiferromagnet. In addition, we have observed release of heat from hydrogen nuclear spins driven by quantum fluctuations near the quantum critical point.

Research Products

• [Journal Article] Specific Heat of the S=1/2 Two-Dimensional Shastry-Sutherland Antiferromagnet SrCu_2(BO_3)_2 in High Magnetic Fields (2011)
  • Author(s): H.Tsujii, C.R.Rotundu, B.Andraka, Y.Takano, H.Kageyama, Y.Ueda
  • Journal Title: Journal of the Physical Society of Japan 80 Pages: 43707-43707
  • Peer Reviewed
• [Journal Article] Specific Heat of the S=1/2 Two-Dimensional Shastry-Sutherland Antiferromagnet SrCu_2(BO_3)_2 in High Magnetic Fields (2011)
  • Author(s): H.Tsuju
  • Journal Title: Journal of the Physical Society of Japan Volume: 80
  • Peer Reviewed
• [Journal Article] Investigation of the heavy fermion state and superconductivity in Pr_1-xLa_xOs_4Sb_12 by the upper critical field slope at T_c (2010)
  • Author(s): B.Andraka, C.R.Rotundu, P.Kumar, H.Tsujii
  • Journal Title: Journal of Physics : Condensed Matter 22
  • Peer Reviewed
• [Journal Article] Fe Magnetic Impurity Effect in Au Atomic Sized Conductor (2010)
  • Author(s): K.Ienaga, Y.Inagaki, T.Kawae, H.Tsujii
  • Journal Title: Journal of Physics : Conference Series 200 Pages: 72042-72042
  • Peer Reviewed
• [Journal Article] Investigation of the heavy fermion state and superconductivity in Pr_(1-x)La_xOs_4Sb_12 by the upper critical field slope at T_c (2010)
  • Author(s): B.Andraka
  • Journal Title: Journal of Physics : Condensed Matter Volume: 22
  • Peer Reviewed
• [Journal Article] Fe Magnetic Impurity Effect in Au Atomic Sized Conductor (2010)
  • Author(s): K.Ienaga
  • Journal Title: Journal of Physics : Conference Series 200 Pages: 72042-72042
  • Peer Reviewed
• [Journal Article] The dilute limit of heavy fermions : evidence of the coherent nature of CeAl_3 (2009)
  • Author(s): B.Andraka, C.R.Rotundu, Y.Takano, H.Tsujii
  • Journal Title: Journal of Physics : Condensed Matter 21
  • Peer Reviewed
• [Journal Article] Magnetic Phase Diagram of the S=1/2 Antiferromagnetic Ladder (CH_3)_2CHNH_3CuCl_3 (2009)
  • Author(s): H.Tsujii, Y.H.Kim, Y.Yoshida, Y.Takano, T.P.Murphy, K.Kanada, T.Saito, A.Oosawa, T.Goto
  • Journal Title: Journal of Physics : Conference Series 150 Pages: 42217-42217
  • Peer Reviewed
• [Journal Article] Magnetic susceptibility of PrMg_3 at ultra low temperatures (2009)
  • Author(s): J.Yoshida, S.Abe, A.Tada, H.Tsujii, K.Matsumoto, H.Suzuki, H.S.Suzuki
  • Journal Title: Journal of Physics : Conference Series 150 Pages: 42241-42241
  • Peer Reviewed
• [Journal Article] The dilute limit of heavy fermions : evidence of the coherent nature of CeAl_3 (2009)
  • Author(s): B.Andraka
  • Journal Title: Journal of Physics : Condensed Matter 21 Pages: 495601-495601
  • Peer Reviewed
• [Journal Article] Magnetic Phase Diagram of the S=1/2 Antiferro magnetic Ladder (CH_3)_2CHNH_3CuCl_3 (2009)
  • Author(s): H. Tsujii
  • Journal Title: Journal of Physics : Conference Series 150 Pages: 42217-42217
  • Peer Reviewed
• [Journal Article] Magnetic susceptibility of PrMg_3 at ultra low temperatures (2009)
  • Author(s): J. Yoshida
  • Journal Title: Journal of Physics : Conference Series 150 Pages: 42241-42241
  • Peer Reviewed
• [Journal Article] Novel Quantum Criticality in CeRu_2Si_2 near Absolute Zero Observed by Thermal Expansion and Magnetostriction (2008)
  • Author(s): J.Yoshida, S.Abe, D.Takahashi, Y.Segawa, Y.Komai, H.Tsujii, K.Matsumoto, H.Suzuki, Y.Onuki
  • Journal Title: Physical Review Letters 101 Pages: 256402-256402
  • Peer Reviewed
• [Journal Article] Novel Quantum Criticality in CeRu_2Si_2 near Absolute Zero Observed by Thermal Expansion and Magnetostriction (2008)
  • Author(s): J. Yoshida
  • Journal Title: Physical Review Letters 101 Pages: 256402-256402
  • Peer Reviewed
• [Presentation] 反強磁性体の量子臨界点近傍での核スピンからの熱発生 (2011)
  • Author(s): 高野安正
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学(新潟県)
  • Year and Date: 2011-03-26
• [Presentation] S=1とS=1/2 を含む有機トリラジカルBIPNNBNOの比熱と磁気相互作用の見積もり (2010)
  • Author(s): 今澤貴史
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学(岡山県)
  • Year and Date: 2010-03-20
• [Presentation] S=1とS=1/2を含む有機トリラジカルBIPNNBNOの比熱測定 (2009)
  • Author(s): 今澤貴史
  • Organizer: 第48回電子スピンサイエンス会年会(SEST2009)
  • Place of Presentation: 神戸大学(兵庫県)
  • Year and Date: 2009-11-12
• [Presentation] Specific Heat Study of an Organic Tri-radical BIPNNBNO Having S=1 and S=1/2, (2009)
  • Author(s): 今澤貴史
  • Organizer: The 3rd Japanese- Russian Workshop on Open Shell Compounds and Molecular Spin Devices
  • Place of Presentation: Awaji Yumebutai International Conference Center, Hyogo.
  • Year and Date: 2009-10-16
• [Presentation] S=1/2Ising型反強磁性鎖BaCo_2V_2O_8の低温磁気トルク (2009)
  • Author(s): 辻井宏之
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 熊本大学(熊本県)
  • Year and Date: 2009-09-26
• [Presentation] S=1/2 Ising 型反強磁性鎖BaCo_2V_2O_8の低温磁気トルク (2009)
  • Author(s): 辻井宏之
  • Organizer: 日本物理学会 2009年秋季大会
  • Place of Presentation: 熊本大学(熊本県)
  • Year and Date: 2009-09-26
• [Presentation] Novel Quantum Criticality in CeRu_2Si_2 at Ultralow Temperatures Observed by Dilatometric Measurements (2009)
  • Author(s): S.Abe
  • Organizer: International Conference on Magnetism (ICM2009)
  • Place of Presentation: Karlsruhe, ermany.
  • Year and Date: 2009-06-28
• [Presentation] Magnetic Phase Diagram of the S=1/2 Antiferromagnetic Ladder (CH_3)_2CHNH_3CuCl_3 (2008)
  • Author(s): 辻井宏之
  • Organizer: 25th International Conference on Low Temperature Physics (LT25)
  • Place of Presentation: Amsterdam, the Netherlands.
  • Year and Date: 2008-08-09
• [Presentation] Anisotropic magnetic phase diagram of the S=1/2 frustrated-chain antiferromagnet Cu_3(CO_3)_2(OH)_2 (2008)
  • Author(s): Y.Yoshida
  • Organizer: 25th International Conference on Low Temperature Physics (LT25)
  • Place of Presentation: Amsterdam, the Netherlands.
  • Year and Date: 2008-08-09
• [Presentation] Magnetic Phase Diagram of the S=1/2 Antiferromagnetic Ladder (CH_3)_2CHNH_3CuCl_3 (2008)
  • Author(s): H. Tsujii
  • Organizer: 25th International Conference on Low Temperature Physics
  • Place of Presentation: Amsterdam
  • Year and Date: 2008-08-09