The transition temperature of a proximity-contact superconducting-normal finite double layer is discussed in the clean limit. The finite reflection coefficient R at the interface is explicitly taken into account. The thickness dependence and the R dependence of Tc are discussed. It is shown that the transition temperature of a very thin double layer cannot be well described by Cooper's formula. The present results qualitatively agree with experiments.
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Ashida et al. (1992) studied this question.
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