Frequency Dependence of the Surface Resistance of Superconducting Tin in the Millimeter Wavelength Region

Abstract

The ratio of the superconducting to normal surface resistance of polycrystalline tin has been measured at seven frequencies between 17 kMc/sec and 77 kMc/sec and at temperatures from 1.5°K to 3.0°K. These data plus those of other investigators have been compared with the predictions of two theories: the first a calculation made by Serber (unpublished) based on the London two-fluid model of superconductivity and the Reuter-Sondheimer theory of the anomalous skin effect, and the second a calculation based on the Bardeen-Cooper-Schrieffer theory as developed by Bardeen and Mattis.