A microwave cryostat is described, which enables us to measure the surface resistance of superconducting films in metastable states. In metastable disordered films often elevated transition temperatures are found. Surface resistance measurements can give information about electronic parameters of such films. In connection with dc-conductivity and critical magnetic field measurements, the mean free path, the penetration depth and the coherence length were determined in the metastable and the annealed state. These values have been compared with those expected from a free electron model.
The transition temperatures of various binary alloys and of ternary alloys in the system T1 Hg x Sny were investigated. By analysing the results different anisotropy parameters were obtained. This was explained by a nonlinear valence dependence of the transition temperature, which can be caused by changes in the topology of the Fermi surface.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.