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

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

1996-05-03

arxiv.org/abs/cond-mat/9605021v2

Phys. Rev. Lett. 77, 4950 (1996)

Physics

Condensed Matter

improved version submitted to Phys. Rev. lett., 4 pages, 5 included epsf figures

Scientific paper

10.1103/PhysRevLett.77.4950

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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