Microwave Studies of Thin Superconducting Films

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Abstract
The results of linear microwave transmission measurements on superconducting tin films are presented. The effects of residual reactances are noted and a comparison is made with calculations based on the BCS theory. Residual reactances are found to have a substantial effect on the nonlinear transmission measurements. They allow a clear separation of regions where superelectron depairing and ``domain growth'' dominate. Linear transmission measurements in the presence of a perpendicular magnetic field suggest the ``domain growth'' is the result of fluxon penetration.