Supercurrents throughSNSproximity-induced junctions

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Abstract
Critical current measurements by Courtois et al. [Phys. Rev. B 52, 1162 (1995)] on proximity-induced superconductivity in a narrow metallic wire are analyzed by a junction model of the author based on the Ginzburg-Landau theory. Good agreement is found if one assumes that the length of at least one of the many superconducting cells is larger than anticipated by a factor of approximately 2. At low temperatures the size of the superconducting region in the normal metal is confined by the length of the normal cell. As a consequence, the critical current saturates below a temperature at which the length of the normal cell becomes approximately three characteristic lengths of the coherent state in the normal metal.

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