London两个方程等价性与临界态形成动力学  

EQUIVALENCE OF LONDON′S EQUATIONS AND DISCUSSION ABOUT CRITICAL STATE BEAN MODEL

作　　者：韩永胜[1,2] 陈曙[1] 杨宏新[1] 

机构地区：[1]中国药科大学,基础科学部,南京210009 [2]南京大学物理系、固体微结构实验室

出　　处：《低温物理学报》2004年第3期194-198,共5页Low Temperature Physical Letters

摘　　要：C .P .Bean基于K .Mendelssohn海绵模型建立了非理想Ⅱ类超导体临界态理论 ,从而形成了硬超导体电磁理论的重要基础之一 .然而近年来基于涡旋动力学理论的发展 ,逐步形成了临界态动力学研究课题 .涡旋运动导致宏观波函数的相滑移 ,和局域的Joule热等强烈非线性效应是形成自组织临界态物理基础 .根据实验观测 ,磁通进入样品的前锋为线性分布 ,但其解析理论还在发展中 .本文论述了在超导体的零电阻和完全抗磁性的实验基础上建立起来的London第一和第二方程本质上的等价性 ,并结合London理论与Anderson磁通热激活理论讨论了临界态形成动力学 ,给出了Slab样品中的电场、电流和磁通密度分布 。Near 40 years ago, Bean established the remarkable critical state theory of the hard superconductors based on the K. Mendelssohn sponge model. This theory became the fundamental theory for the hard superconductor electromagnetic properties. Recently, the study of the critical state dynamics has achieved great advance based on the development of vortex dynamics. The basis of Self-organized criticality physics is the strong nonlinear effects, such as local Joule heat and vortex motion which leads to the phase sliding of macro wave function. Some experiments illustrate that the flux front is linear distribution as the flux penetrates into the superconductor. Its analytic interpretation is under development. In this article, we deal with this subject based on London′s theory and Anderson′s flux motion model, and illustrate the electrical field distribution, current density and magnetic field distribution in the sample.

关 键 词：涡旋动力学 磁通密度分布 BEAN模型 Slab样品 超导体 

分 类 号：O511[理学—低温物理]