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Transition and Dynamics in Complex Systems

Research Project

Project/Area Number 06044031
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionUniversity of Tokyo (1995)
University of Tsukuba (1994)

Principal Investigator

TAKAYAMA Hajime  Institute for Solid State Physics, University of Tokyo Professor, 物性研究所, 教授 (40091475)

Co-Investigator(Kenkyū-buntansha) ORBACH R.  University of California, Riverside, 教授
CLARK W.G.  University of California, Los Angeles, 教授
CAMPBELL I.  Physique des Solides, Universite Paris-Sud, 教授
OCIO M.  Service de Physique de l'Etat Condense, Commissariat a l'Energie Atomique Saclay, 凝縮系物理部門, 磁性研究室長
KAWAMURA Hikaru  Faculty of Engineering and Design, Kyoto Institute of Technology, 工芸学部, 教授 (30153018)
ITO Atsuko  Faculty of Science, Ochanomizu University, 理学部, 教授 (20017180)
MIYAKO Yoshihito  Faculty of Science, Osaka University, 理学部, 教授 (10000837)
SUZUKI Masuo  Faculty of Science, University of Tokyo, 理学系研究科, 教授 (80013473)
ORBACK R.  カルフォルニア大学, リバーサイド校, 教授(学長)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥10,700,000 (Direct Cost: ¥10,700,000)
Fiscal Year 1995: ¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1994: ¥5,200,000 (Direct Cost: ¥5,200,000)
KeywordsComplex systems / Frustrated systems / Spin glasses / Ceramic Superconductors / Heavy electron / Spin-density wave / Aging phenomena / Slow dynamics / Reentrant transition / ウラン族化合物 / Aging現象 / ゲージグラス / 逐次反強磁性転移 / 緩和時間分布 / シミュレーション
Research Abstract

In the course of the project several members and their collaborators were individually exchanged between the two countries (France and US) and Japan. The two workshops were held ; one on October 17-18,1994 at University of Tsukuba, and the other entitled "Physics of Frustrated Systems" on December 4-6,1995 at CEA-Saclay. Below we briefly describe the main results obtained by the project.
1) Transitions and Dynamics in spin glasses (SG's) : By the computational method Takayama has shown that slow dynamics in the 'Griffiths phase' consists of two processes, ordinary critical dynamics and cluster dynamics, while Campbell has pointed out a non-universal nature of Ising SG's. Ito has observed a divergent bahavior in the nonlinear susceptibility at the reentrant transition point to the mixed phase.
2) Aging Phenomena in SG's in Magnetic Fields : Ocio has found a universal scaling form for the time development of TRM and IRM including their waiting time dependence, while Orbach has proposed a way to extract the overlap function P (q) from the observed aging phenomena.
3) Phase Dynamics in Granular (Ceramic) Superconductors : From the measurement on 1/f noise Ocio has pointed out a possible existence of pi-junction, and Kawamura has developed a theory of the random freezing of 'chiralities' in these systems.
4) Heavy Electron Systems Ce (Ru_<0.85>Rh_<0.15>)_2Si_2 : In this material Miyako has observed the crossover from the high-T localized spin state to the low-T heavy electron state, and then to the spin-density wave (SDW) phase associated with the INVAR effect.
5) SDW Dynamics in (TMTSF)_2PF_6 : Clark has found that the repining process of SDW is governed by thermally excited quasi-particles at high T,but by their quantum tunneling at low T.
6) General Theory for Phase Transitions : Suzuki has developed general theories, such as the 'decomposition of exponential operators', and has applied them to various systems with exotic phase transitions.

Report

(2 results)
  • 1995 Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (61 results)

All Other

All Publications (61 results)

  • [Publications] H.Takayama: "Slow Dynamics in Spin Glasses" Computational Physics as a New Frontier in Condensed Matter Research. 230-241 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Takayama: "Magnetic Responses of Mean-Field Ising Models for Reentrant Spin Glasses" Journal of the Physical Society of Japan (to appear). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Suzuki: "Hybrid Exponential Product Formulas for Unbounded Operators with Possible Applications to Monte Carlo Simulations" Physics Letters A. 201. 425-428 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kobayashi: "Relaxation from a Metastable State due to Quantum Fluctuation" Physica A. (to appear). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Inoue: "High Field Magnetization of C14-Laves Phase RMn2 (R=Y,Gd,Tb,Dy and Yb)" Journal of the Physical Society of Japan. 64. 680-683 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Takeuchi: "Magnetic Properties of RERu2Si2 (RE=Tb,Dy and Ho)" Physica B. 206-207. 398-401 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A.Ito: "Studies of Diluted Antiferromagnet Fe0.2Mg0.8TiO3 : Percolation Concentration and Cluster-Glass" Journal of the Physical Society of Japan. 64. 1766-1774 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.Mattsson: "No Phase Transition in a Magnetic Field in the Ising Spin Glass Fe0.5Mn0.5TiO3" Physical Review Letters. 74. 4305-4308 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kawamura: "Numerical Studies of Chiral Ordering in Three-Demensional XY Spin Glasses" Physical Review B. 51. 12398-12409 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kawamura: "Chiral Order in Spin Glasses" Computational Physics as a New Frontier in Condensed Matter Research. 209-220 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E.Vincent: "Contrasting Effects of Field and Temperature Variations on Aging in Spin Glasses" Philosophical Magazine B. 71. 489-500 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] L.Bernardi: "Violation of Universality for Ising Spin Glass Transitions" Physical Review B. 52. 12501-12504 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] L.Bernardi: "Frustration,Randomness and the Spin Glass Transition" Physical Review B. 52. R9819-9822 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] W.G.Clark: "Magnetic Resonance Spectral Reconstruction Using Frequency-Shifted and Summed Fourier Transform Processing" Review of Scientific Instruments. 66. 2453-2464 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] W.G.Clark: "Magnetic Spin Echo Response to a Moving Vortex Lattice in a Type II Superconductor" Physical Review B. 52. 7488-7494 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] D.Chu: "Effect of Magnetic Fields on the Relaxation of the Thermoremanent Magnetization in Spin Glasses" Philosophical Magazine B. 71. 479-488 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] G.G.Kenning: "The Thermoremanent Magnetization as a Probe of the Field Quenched States in Spin Glasses" Physical Review B. 52. 3479-3482 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] L.Bernardi: "Frustration, Randomness and the Spin Glass Transition" Physical Review B. 52. R9819-9822 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] W.G.Clark: "Magnetic Resonance Spectral Reconstruction Using Frequency-Shifted and Summed Fourier Transform Processing" Review of Scientific Instuments. 66. 2453-2464 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] W.G.Clark: "Magnetic Spin Echo Response to a Moving Vortex Lattice in a Type II Superconductor" Physical Review B. 52. 7488-7494 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] D.Chu: "Effect of Magnetic Fields on the Relaxation of the Thermoremanent Magnetization in Spin Glasses" Philosophical Magazine B. 71. 479-488 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] G.G.Kenning: "The Thermoremanent Magnetization as a Probe of the Field Quenched States in Spin Glasses" Physical Review B. 52. 3479-3482 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A.Ito: "Studies of Diluted Antiferromagnet Fe_<0.2>Mg_<0.8>TiO_3 : Percolation Concentration and Cluster-Glass" Journal of the Physical Society of Japan. 64. 1766-1774 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] J.Mattsson: "No Phase Transition in a Magnetic Field in the Ising Spin Glass Fe_<0.5>Mn_<0.5>TiO_3" Physical Review Letters. 74. 4305-4308 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kawamura: "Numerical Studies of Chiral Ordering in Three-Dimensional XY Spin Glasses" Physical Review B. 51. 12398-12409 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kawamura: "Chiral Order in Spin Glasses" Computational Physics as a New Frontier in Condensed Matter Research. 209-220 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E.Vincent: "Contrasting Effects of Field and Temperature Variations on Aging in Spin Glasses" Philosophical Magazine B. 71. 489-500 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] L.Bernardi: "Violation of Universality for Ising Spin Glass Transitions" Physical Review B. 52. 12501-12504 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Takayama: "Slow Dynamics in Sping Glasses" Computational Physics as a New Frontier in Condensed Matter Research. 230-241 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Takayama: "Magnetic Responses of Mean-Field Ising Models for Reentrant Spin Glasses" Journal of the Physical Society of Japan. (to appear). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Suzuki: "Hybrid Exponential Product Formulas for Unbounded Operators with Possible Applications to Monte Carlo Simulations" Physics Letters A. 201. 425-428 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kobayashi: "Relaxation from a Metastable State due to Quantum Fluctuation" Physica A (to appear). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Inoue: "High Field Magnetization of C_<14>-Laves Phase RMn_2 (R=Y,Gd, Tb, Dy and Yb)" Journal of the Physical Society of Japan. 64. 680-683 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Takeuchi: "Magnetic Properties of RERu_2Si_2 (RE=Tb, Dy and Ho)" Physica B. 206-207. 398-401 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Takayama: "Slow Dynamics in 3D±J Heisenberg Spin Glass: Monte Carlo Analysis of Auto-Correlation Functions of Individual Spins" Physica A. 204. 650-659 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 高山 一: "スピングラス" 個体物理. 30. 93-101 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Suzuki: "Convergence of General Decompositions of Exponential Operators" Comm.Math.Phys. 163. 491-508 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Suzuki: "Coherent-Anomaly Method-Recent Developments" Physica A. 205. 80-100 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Asakawa: "Possibility of a Sublattice Order of the Kagome Antiferromagnet" Physica A. 205. 687-701 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Nonomura: "Cluster-Effectice-Field Study on the Ground-State Phase Diagram of the J_1-J_2 Model" J.Phys.Soc.Jpn.63. 1273-1276 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Kuwai: "Low Temperature Magnetic Properties of UAL_2: The Kondo Effect" J.Phys.Soc.Jpn.63. 10 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Kawarazaki: "Observation of the Singlet-Singlet Crystal Field Excitons in PrCu_2 by Neutron Scattering" J.Phys.Condensed Matter. (to appear).

    • Related Report
      1994 Annual Research Report
  • [Publications] R.Hamada: "Magnetic Preperties of ErRu_2Si_2" J.Mag.Mag.Mater.(to appear).

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Kawarazaki: "Neutron diffraction study on the magnetism of the Ce(Ru_<(1-X)>Rb_X)_2Si_2" Physica B. (to appear).

    • Related Report
      1994 Annual Research Report
  • [Publications] J.Hammann: "Scanning the phase space in Spin Glasses in “Random Magnetism and High Temperature Superconductivity"" World Scientific. 31-58 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] L.Leylekian: "Gauge glass propertics in a granular La_1._8Sr._2CuO_4 Superconductor" Physica B. 194-195. 1865 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] F.Lefloch: "Spin glasses in magnetic field: phase diagram and dynamics" Physica B. (to appear).

    • Related Report
      1994 Annual Research Report
  • [Publications] L.Bernardi: "Dynamic Simulations and Critical Exponents in Spin Glasses" Europhys.Letters. 26. 147 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] L.Bernardi: "Dynamical critical exponents in Ising Spin Glasses" Phys.Rev.B. 49. 728 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] I.A.Campbell: "Dynamics in canonical spin glasses observed by muon spin depolarization" Phys.Rev.Lett.72. 1291-1294 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] D.Prost: "Quantum tunneling of flux lines in BiSrCaCuO" Phys.Rev.B. 47. 3457 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] I.A.Campbell: "Dynamics of Ising spin glasses above the freezing temperature" Phys.Rev.B. (to appear).

    • Related Report
      1994 Annual Research Report
  • [Publications] W.H.Wong: "Restoring Force and Displacement of the Pinned Spin Density Wave Condensate in (TMTSF)_2PF_6" Phys.Rev.Lett.72. 2640-2643 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] W.G.Clark: "Spin Echo Measurement of the Sliding Spin Density Wave Velocity in(TMTSF)_2PF_6" Phys.Rev.B. 49. 11895-9 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] W.G.Clark: "Evidence that the Spin Density Wave Transition in(TMTSF)PF is First Order" Physica B. 194-196. 285-6 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] E.ter Haar: "Brute force nuclear polarization of D" J.Low Temp.Phys.94. 361-71 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] W.G.Clark: "NMR Spin echo measurement of vortex motion and the penetration depth of a type II superconductor" J.Phys.Paris IV. (to appear).

    • Related Report
      1994 Annual Research Report
  • [Publications] D.Chu: "Dynamic Measurements in a Heisenberg Spin Glass: Cu:Mn" Phys.Rev.Lett.72. 3270-3273 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] R.Orbach: "High Energy Vibrational Lifetimes in a-Si:H" J.Phys.Chem. 98. 7411-7418 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] D.Chu: "Effect of Magnetic Fields on the Relaxation of the Thermoremanent Magnetization in Spin Glasses" Phil.Mag.(to appear).

    • Related Report
      1994 Annual Research Report
  • [Publications] 鈴木 増雄: "統計力学(岩波講座 現代の物理学)" 岩波書店, 316 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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