New Types of Structural Phase Transition and The Dynamics

新型结构相变及其动力学

基本信息

批准号：
60302023
负责人：
HORIE Chuji
金额：
$ 3.26万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60302023/
关键词：
structural phase transition charge density wave (CDW)commensurate-incommensurate transition soliton discommensuration formation and growth of pattern glass transition ステージ転移

项目摘要

Results of the research are summarized as follows:1. Photo-induced structural phase transition: This is a new type of transition between non-equilibrium systems. The new idear and interpretation was obtained for concrete examples.2. Charge density waves (CDW) : The commensurate and incommensurate (C-IC) transition accompanying CDW was studied both macro- and microscopic points of view. The important roles of electron-lattice interactions was ellucidated.3. Dynamics of C-IC transitions, formation and growth of patterns: It eas pointed out that the transition process is described in terms of motion of discommensurations.4. Dynamics of solitons: The fundamental relation between fluctuations and pinning od CDW and superconducting state was made clear. The effect of collision of solitons with phonons was investigated.5. Glass transition: A new technique for molecular dynamics under isothermal or isobaric conditions was developed and applied to investigate the annealing effect. It was shown that there was a possibility for finding a new type of glass phase in the system composed of ferro-electric and antiferro-electric materials.6. Stage transformation in intercalation compounds: Temporal development of stage transformation in graphite intercalation compounds was investigated by means of computer simulation.7. Others: The microscopic mechanism of premartensitic transformation was proposed.

研究结果总结如下：1。光诱导的结构相变：这是非平衡系统之间的一种新型的转变。为具体示例获得了新的纪录和解释。2。电荷密度波（CDW）：伴随宏观和微观观点研究了伴随CDW的相称和不一致的（C-IC）转变。电子晶体相互作用的重要作用被椭圆形。3。 C-IC转变，模式的形成和生长的动力学：它指出了过渡过程是根据脱节运动描述的。4。孤子动力学：波动与固定CDW和超导状态之间的基本关系已清楚。研究了孤子与声子碰撞的影响5。玻璃转变：在等热条件下或等同条件下的一种新技术，并应用于研究退火效果。结果表明，有可能在由铁电和抗铁电材料组成的系统中找到一种新型的玻璃相。6。插入化合物中的阶段转化：通过计算机模拟研究了石墨插入化合物中阶段转化的时间发展。7。其他：提出了前敏感转化的微观机制。