在交变外磁场作用下处于迈斯纳态的超导体内的电磁场和能量变化（英文）  

ELECTROMAGNETIC FIELDS AND ENERGIES IN A SUPERCONDUCTOR IN THE MEISSNER STATE WHEN SUBJECTED TO AN ALTERNATING MAGNETIC FIELD

作　　者：赵尚武[1,2] 王海飞[1] 杨新荣[1] 王秋良[2] 

机构地区：[1]邯郸学院,河北邯郸056005 [2]中国科学院电工研究所,北京100080

出　　处：《低温物理学报》2015年第1期65-69,共5页Low Temperature Physical Letters

基　　金：Project supported by the Provincial Natural Science Foundation of Hebei(Grant No.E2012109001);the Provincial Science & Technology Pillar Program of Hebei(Grant Nos.10213938,10213936)~~

摘　　要：本文以一个无限大的超导平板为例,分析它在正弦外磁场作用下处于Meissner态时的电磁场以及能量变化的特征,计算结果表明在准静态外磁场作用下超导体内的磁场、电场以及感应电流都随着透入表面的深度迅速衰减而没有滞后现象.根据超导电流和穿透深度的定义以及London方程,分析了超导体内超导电流与感应电场乘积的物理意义.我们计算并分析了流入超导体的电磁能与内部的磁场能、电场能、超导电子动能之间的转化关系,结果表明这四种能量之间的转化是完全可逆的,超导体内不存在任何损耗.In this paper an infinite superconducting niobium slab subjected to a harmonic ambient magnetic field is taken as example and its electroma.gnetic characteristics in the Meissner state are analyzed according to the London- Maxwell equations. It turns out that all the electromagnetic quantities just decrease sharply with a distance from the surface/and have no hysteresis properties in quasi-stationary processes. Then the temporal＇ distribution of all the en- ergies is analyzed, for example, electromagnetic energy flux, magnetic field energy, electric field energy, and kinetic energy of superelectrons. It is founded that there are just conversions of four kinds of energies and not any losses in the superconductor in the Meissner state.

关 键 词：伦敦方程 电磁特征 能量损耗 迈斯纳态 

分 类 号：O511[理学—低温物理]