EFFECTS OF FLUX FLOW, FLUX PINNING, AND FLUX CREEP UPON THE RF SURFACE IMPEDANCE OF TYPE-II SUPERCONDUCTORS

被引：28

作者：

CLEM, JR ^{[1
]}

COFFEY, MW ^{[1
]}

机构：

[1] IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011

来源：

JOURNAL OF SUPERCONDUCTIVITY | 1992年 / 5卷 / 04期

关键词：

SURFACE IMPEDANCE; COMPLEX PENETRATION DEPTH; FLUX FLOW; FLUX PINNING; FLUX CREEP;

D O I：

10.1007/BF00618130

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The presence of vortices is known to have an important effect upon the rf surface impedance Z(s) of type-II superconductors. In this paper we summarize a new theoretical approach that permits the influence of flux flow, flux pinning, and flux creep upon Z(s) = R(s) - iX(s) to be calculated over a wide range of angular frequencies omega, magnetic inductions B, and temperatures T. The normal-fluid excitations and the nonlocality of vortex-generated fields are also accounted for. The physics is conveniently described in terms of a complex penetration depth lambda(omega, B, T), to which the surface impedance is related via Z(s) = -imu0omegalambda(omega, B, T). We limit our attention to the linear response of the superconductor in the low-rf-power regime for which the surface impedance is power-independent.

引用

页码：313 / 318

页数：6

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