Transition and Dynamics in Complex Systems
复杂系统中的转变和动力学
基本信息
- 批准号:06044031
- 负责人:
- 金额:$ 6.85万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for international Scientific Research
- 财政年份:1994
- 资助国家:日本
- 起止时间:1994 至 1995
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
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.
在项目过程中,几名成员和他们的合作者分别在两国(法国和美国)和日本之间交换。举办了两个讲习班;一次于1994年10月17日至18日在筑波大学举行,另一次于1995年12月4日至6日在CEA-Saclay举行,题为“受挫系统的物理学”。下面我们简要介绍了该项目取得的主要成果。1)自旋玻璃(SG’s)中的跃迁和动力学:Takayama通过计算方法表明,“Griffiths相”中的慢动力学由两个过程组成,即普通临界动力学和簇动力学,而Campbell指出了Ising SG’s的非普遍性质。伊藤观察到混合相在可重入过渡点的非线性磁化率具有发散性。2)磁场中SG的老化现象:Ocio发现了TRM和IRM时间发展的通用标度形式,包括它们的等待时间依赖关系,而Orbach提出了一种从观察到的老化现象中提取重叠函数P (q)的方法。3)颗粒(陶瓷)超导体中的相动力学:从对1/f噪声的测量中,Ocio指出了pi结的可能存在,Kawamura提出了这些系统中“手性”随机冻结的理论。4)重电子系统Ce (Ru_<0.85>Rh_<0.15>)_2Si_2:在这种材料中,Miyako观察到从高t局域自旋态到低t重电子态,再到与INVAR效应相关的自旋密度波(SDW)相的交叉。5) (TMTSF)_2PF_6中的SDW动力学:Clark发现SDW的扩散过程是由高T时的热激发准粒子控制的,但在低T时则是由它们的量子隧穿控制的。6)相变的一般理论:Suzuki发展了一般理论,如“指数算子分解”,并将其应用于各种具有奇异相变的系统。
项目成果
期刊论文数量(22)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
E.Vincent: "Contrasting Effects of Field and Temperature Variations on Aging in Spin Glasses" Philosophical Magazine B. 71. 489-500 (1995)
E.Vincent:“自旋玻璃中场和温度变化对老化的对比影响”哲学杂志 B. 71. 489-500 (1995)
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- 影响因子:0
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- 通讯作者:
R.Hamada: "Magnetic Preperties of ErRu_2Si_2" J.Mag.Mag.Mater.(to appear).
R.Hamada:“ErRu_2Si_2 的磁性特性”J.Mag.Mag.Mater.(即将出现)。
- DOI:
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- 影响因子:0
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- 通讯作者:
H.Takayama: "Slow Dynamics in Spin Glasses" Computational Physics as a New Frontier in Condensed Matter Research. 230-241 (1995)
H.Takayama:“自旋玻璃中的慢动力学”计算物理学作为凝聚态物质研究的新前沿。
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- 影响因子:0
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H.Kawamura: "Numerical Studies of Chiral Ordering in Three-Demensional XY Spin Glasses" Physical Review B. 51. 12398-12409 (1995)
H.Kawamura:“三维 XY 自旋玻璃中手性排序的数值研究”物理评论 B.51.12398-12409 (1995)
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- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
S.Kawarazaki: "Neutron diffraction study on the magnetism of the Ce(Ru_<(1-X)>Rb_X)_2Si_2" Physica B. (to appear).
S.Kawarazaki:“Ce(Ru_<(1-X)>Rb_X)_2Si_2 磁性的中子衍射研究”Physica B.(待发表)。
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TAKAYAMA Hajime其他文献
TAKAYAMA Hajime的其他文献
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{{ truncateString('TAKAYAMA Hajime', 18)}}的其他基金
Glassy Dynamics in Random Spin Systems
随机自旋系统中的玻璃动力学
- 批准号:
12640367 - 财政年份:2000
- 资助金额:
$ 6.85万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Aging Phenomena in Spin Glasses
旋转玻璃的老化现象
- 批准号:
10640362 - 财政年份:1998
- 资助金额:
$ 6.85万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Statistical Physics of Fluctuations in Glassy
玻璃态涨落的统计物理
- 批准号:
10044064 - 财政年份:1998
- 资助金额:
$ 6.85万 - 项目类别:
Grant-in-Aid for Scientific Research (B).
Aging Phenomena in Complex Systems
复杂系统中的老化现象
- 批准号:
08044060 - 财政年份:1996
- 资助金额:
$ 6.85万 - 项目类别:
Grant-in-Aid for international Scientific Research
Studies on Mechanisms of Hierarchical Relaxation in Spin Glasses
自旋玻璃分级弛豫机制研究
- 批准号:
08640477 - 财政年份:1996
- 资助金额:
$ 6.85万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Ergodic-NonErgodic Transition Phenomena in Condensed Matters
凝聚态物质中的历经-非历经转变现象
- 批准号:
01540298 - 财政年份:1989
- 资助金额:
$ 6.85万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
Dynamics Associated with Metastable States in Random Systems
与随机系统中亚稳态相关的动力学
- 批准号:
60540227 - 财政年份:1985
- 资助金额:
$ 6.85万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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