Abstract
The proximity effect of a thin normal metal layer in a superconductor is investigated by solving the phenomenological Ginzburg-Landau equations. The thickness of the normal layer is assumed to be much smaller than the electron mean free path. The degradation of the induced order parameter in the normal layer from the bulk superconductivity is proportional to both the repulsive potential for Cooper pairs in the normal layer and its thickness. It is elucidated that the superconductivity is degradated also in the superconducting region in the vicinity of the normal layer. The present result is compared with the result of the McMillan's tunneling theory.
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