Abstract
The superconducting transition temperatures of Cd and Zn films deposited upon a liquid3He-cooled substrate increase compared to the bulk values. In disordered Cd, values of around 0.9 K are obtained, while correspondingT c for Zn is about 1.4 K. These values agree well with theoretically predicted ones. For a Cd0.9Ge0.1, probably amorphous, film,T c is further increased to about 1.6 K in approximate agreement with theory. The ratio between the energy gap andT c , 2Δ(0)/k B T c , remains considerably lower than 3.53 in all the disordered films. This, as well as fairly broad transition ranges and the shape of the fluctuation pairing contribution to the conductance, is taken as an indication of structural inhomogeneities of the films. In pure, quenchcondensed Mg films, no superconductivity is detected above 0.35 K.
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Granqvist, C.G., Claeson, T. Superconducting energy gaps and transition temperatures of quench-condensed cadmium and zinc films. J Low Temp Phys 10, 735–750 (1973). https://doi.org/10.1007/BF00655462
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DOI: https://doi.org/10.1007/BF00655462