Proximity-induced screening and its magnetic breakdown in mesoscopic hybrid structures

Details Proximity-induced screening and its magnetic breakdown in mesoscopic hybrid structures Proximity-induced screening and its magnetic breakdown in mesoscopic hybrid structures

2002-11-13

arxiv.org/abs/cond-mat/0211251v1

Physics

Condensed Matter

Superconductivity

7 pages, 2 figures

Scientific paper

10.1103/PhysRevB.67.184518

We derive a general microscopic expression for the non-linear diamagnetic current in a clean superconductor-insulator-normal metal structure with an arbitrary interface transmission. In the absence of electron-electron interactions in the normal metal the diamagnetic response increases monotonously with decreasing temperature showing no sign of paramagnetic reentrance down to T=0. We also analyze the magnetic breakdown of proximity induced Meissner screening. We demonstrate that the magnetic breakdown field should be strongly suppressed in the limit of small interface transmissions while the linear diamagnetic current does not depend on the transmission of the insulating barrier at low enough temperatures.

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