Effects of flux flow, flux pinning, and flux creep upon the rf surface impedence of type-II superconductors

Journal Article · Sat Aug 01 04:00:00 EDT 1992 · Journal of Superconductivity; (United States)

DOI:https://doi.org/10.1007/BF00618130· OSTI ID:7307187

Clem, J R; Coffey, M W ^[1]

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1. Ames Lab., IA (United States) Iowa State Univ., Ames, IA (United States)

The presence of vortices is known to have an important effect upon the rf surface impedance Z[sub 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[sub s] = R[sub s]-iX[sub 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 [bar [lambda]]([omega], B, T), to which the surface impedance is related via Z[sub s] = -i[mu][sub 0][omega][bar [lambda]]([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. 19 refs., 4 figs.

• DOE Contract Number: W-7405-ENG-82; FG02-90ER45427
• OSTI ID: 7307187
• Journal Information: Journal of Superconductivity; (United States), Journal Name: Journal of Superconductivity; (United States) Vol. 5:4; ISSN JOUSEH; ISSN 0896-1107
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360607 -- Other Materials-- Superconducting Properties-- (1992-)
665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CREEP
IMPEDANCE
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC PROPERTIES
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
PHYSICAL PROPERTIES
RF SYSTEMS
SUPERCONDUCTORS
SURFACE PROPERTIES
TYPE-II SUPERCONDUCTORS
VORTICES