Diamagnetic Response of Normal-Superconducting Double Layers
Abstract
The diamagnetism of a normal metal (N: Cu or Au), which is induced by the proximity effect of a superconductor (S: Nb), has been investigated for N-S double layers, which are formed by a thin-film deposition process. Detailed studies of samples, which have different electronic mean-free path N in N, suggest that N should be controlled by the impurity concentration rather than the mechanical imperfections in the lattice in order to clarify the N dependence of the proximity effect. Both the screening distance in N and the parameter in T- increase with an increase in N. This result can be understood on the assumption that the normal metal changes its behavior from the "dirty" limit (N>N) to the "clean" limit (N<N), where N is the coherence length in N.
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