Abstract
The surface resistance of a metal coated with amorphous superconducting films is investigated. With an improved microwave cryostat and a two layer model considering the influence of the substrate, much thinner films can be used than previously. As an example the surface resistance of amorphous Ga is determined. A set of parametersΔ0/kBTc=2,27;λL=13,4 nm;ξ0=223 nm andl=1,0 nm describes the temperature dependence independent of thickness. As expected a model of free electrons is in agreement with the experimental results. For crystallineβ-GaΔ0/kBTc=1,91;λL=24 nm;ξ0=163 nm and a much larger mean free pathl=22 nm is found.
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