Abstract
The variation in the superconducting transition temperature of Sb/Sn thin films with a fixed thickness ratio was measured as a function of the total layer number. Samples were prepared by alternate deposition of Sb and Sn. The thickness ratios of Sb layer to Sn layer were 2/8, 4/8, 8/8(Å/Å). The total layer number with a fixed thickness ratio were 11, 21, 31, 41. As the observed transition temperature was independent of the total layer number, the Cooper limit approximation is employed for a proximity-effect analysis of the samples. The observed transition temperature was always higher than that calculated by the Cooper theory. This is explained by the existence of the interfaces, which suppress the decrease of the transition temperature, and by the change in the BCS coupling constants of the compositions due to the alternate deposition.
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