高温超导体脉冲磁化过程中的磁热不稳定性  

MAGNETIC INSTABILITIES IN HIGH-T_c SUPERCONDUCTOR DURING IMPULSE EXCITATION

作　　者：丘明[1] 韩朔[1] 林良真[1] 

机构地区：[1]中国科学院电工研究所

出　　处：《低温物理学报》1996年第5期368-373,共6页Low Temperature Physical Letters

基　　金：国家自然科学基金;中科院电工所所长基金

摘　　要：该文主要研究了高温超导体（ＨＴＳ）在脉冲磁场中的磁热稳定性，与传统低温超导体相比，ＨＴＳ所不同的是最不稳定的状态发生在磁通跳跃区，理论上借助Ｅ－ｊ曲线和有限热扩散方程推导了磁通跳跃场与变场速率的关系表达式：Ｂｉ＝Ｆ（１／Ｂｅ），其规律基本与实验结果相符合，同时从实验中发现磁热不稳定性对永磁体脉冲磁化效果有巨大的影响．Abstract The paper investigates magnetic stability of High-Tc Superconductor in impulse fields. It has been shown that the instablest state occurs at flux-creep region for High-Tc Superconductor. The dependence of the instability field on the rate of change for the external field was obtained by the analysis of E-j curve and the dynamic theory of finite thermal diffusivity. The theoretical result has been compared with the experimental data. The influence of instability on impulse excitation was also preliminarily indicated.

关 键 词：高TC 超导体 磁化 磁热不稳定性 

分 类 号：O511.2[理学—低温物理]