Coherent Electron Transport in Superconducting-Normal Metallic Films

Details Coherent Electron Transport in Superconducting-Normal Metallic Films Coherent Electron Transport in Superconducting-Normal Metallic Films

1997-05-22

arxiv.org/abs/cond-mat/9705225v1

Physics

Condensed Matter

Superconductivity

4 Pages RevTex, 4 Postscript figures; submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.80.4289

We study the transport properties of a quasi-two-dimensional diffusive normal metal film attached to a superconductor. We demonstrate that the properties of such films can essentially differ from those of quasi-one-dimensional systems: in the presence of the proximity induced superconductivity in a sufficiently wide film its conductance may not only increase but also decrease with temperature. We develop a quantitative theory and discuss the physical nature of this effect. Our theory provides a natural explanation for recent experimental findings referred to as the ``anomalous proximity effect''.

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