有关运动超导体电磁性质的几点讨论

在伦敦方程和电磁场的洛伦兹变换的基础上讨论了在磁场中运动的第一类超导平板的电磁性质。结果表明临界磁场将随超导体的速度的增加而减小 ;在穿透层内有一指数衰减的屏蔽电荷分布 ,其符号与超导体表面由运动感生的电荷相反、数量相等。屏蔽电荷屏蔽了表面电荷产生的感应电场 ,使电场和磁场一样在穿透层内指数衰减 ,在远离表面的内部 ,感应电场被完全屏蔽

Discussion on the Electromagnetic Properties of a Moving Superconductor

This paper discusses the electromagnetic properties of a first kind superconducting plate moving in a magnetic field based on the London equation and the Lorentz transformation of electromagnetic field. It is shown that the critical field of the superconductor decreases with the increase of the velocity of the superconductor. There will be shielding charges in the penetration layer with a exponential distribution. The shielding charge has opposite sign and equal amount to the surface induced charge caused by moving. The shielding charge shields the induced electric field like the shielding current shields the magnetic field. Thus, the electric field decays exponentially in the penetration layer as the magnetic field. In the deep internal far away from the surface of the superconductor the induced electric field can be totally shielded.