Re-entrance of the metallic conductance in a mesoscopic proximity superconductor
P. Charlat, H. Courtois, Ph. Gandit, D. Mailly, A. F. Volkov, B. Pannetier
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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