reentrance effect in normal-metal/superconducting hybrid loops

Details reentrance effect in normal-metal/superconducting hybrid loops reentrance effect in normal-metal/superconducting hybrid loops

1998-05-22

arxiv.org/abs/cond-mat/9805298v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.60.15356

We have measured the transport properties of two mesoscopic hybrid loops composed of a normal-metal arm and a superconducting arm. The samples differed in the transmittance of the normal/superconducting interfaces. While the low transmittance sample showed monotonic behavior in the low temperature resistance, magnetoresistance and differential resistance, the high transmittance sample showed reentrant behavior in all three measurements. This reentrant behavior is due to coherent Andreev reflection at the normal/superconducting interfaces. We compare the reentrance effect for the three different measurements and discuss the results based on the theory of quasiclassical Green's functions.

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