Bean临界态模型动力学基础讨论  

DISCUSSION ABOUT CRITICAL STATE BEAN MODEL

作　　者：韩永胜[1] 袁国秋[1] 俞力[1] 徐小农[1] 卢定伟[1] 金新[1] 

机构地区：[1]南京大学物理系

出　　处：《低温物理学报》2003年第A01期50-54,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 .本文根据London超导理论 ,并结合Anderson磁通热激话理论讨论了该课题 ,给出了Slab样品中的电场、电流和磁通密度分布 ,定量解释了实验观察到的现象 .Near 40 years ago, Bean based on the K. Mendelssohn sponge model established the remarkable critical state theory of the hard superconductors. This theory became the fundamental theory on discussing the hard superconductor electromagnetic properties. Recently, the study of the critical state dynamics, based on the development of vortex dynamics, has achieved great advance. 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, and its analytic interpretation is in developing. 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：Bean临界态模型 涡旋动力学 磁通密度分布 Slab样品 临界电流分布 电场分布 高温超导 

分 类 号：O513[理学—低温物理]