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Re-entrance of the metallic conductance in a mesoscopic proximity superconductor

P. Charlat·H. Courtois·Ph. Gandit·D. Mailly·A. F. Volkov·B. Pannetier
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Abstract

We present an experimental study of the diffusive transport in a normal metal near a superconducting interface, showing the re-entrance of the metallic conductance at very low temperature. This new mesoscopic regime comes in when the thermal coherence length of the electron pairs exceeds the sample size. This re-entrance is suppressed by a bias voltage given by the Thouless energy and can be strongly enhanced by an Aharonov Bohm flux. Experimental results are well described by the linearized quasiclassical theory.

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P. Charlat, H. Courtois, Ph. Gandit, D. Mailly, A. F. Volkov, B. Pannetier. 1996-09-30. Re-entrance of the metallic conductance in a mesoscopic proximity superconductor. https://doi.org/10.1103/physrevlett.77.4950

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