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Fluctuation-Induced Conductivity of Superconducting Films with the Lithium Fluoride Precoating

Effect of the lithium fluoride precoating on the fluctuation-induced conductivity (FIC) above the superconducting transition temperature was investigated for indium and vanadium films. Samples were precoated with lithium fluoride (about 3000A in thickness). The FIC is well explained by the traditional fluctuation theory with three parameters, the superconducting transition temperature Tc, the pair-breaking parameter δ and the normal sheet resistance Rn□. The precoating effect changes the coefficient b of the experimental relation δ=a+bRn□. The morphology of these films was observed by the electron microscope. The correlation between the pair-breaking parameter and the grain size is discussed.