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Overscreening Diamagnetism in Cylindrical Superconductor-Normal Metal-Heterostructures

W. Belzig·C. Bruder·Yu. V. Nazarov
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Abstract

We study the linear diamagnetic response of a superconducting cylinder coated by a normal-metal layer due to the proximity effect using the clean limit quasiclassical Eilenberger equations. We compare the results for the susceptibility with those for a planar geometry. Interestingly, for $R\sim d$ the cylinder exhibits a stronger overscreening of the magnetic field, i.e., at the interface to the superconductor it can be less than (-1/2) of the applied field. Even for $R\gg d$, the diamagnetism can be increased as compared to the planar case, viz. the magnetic susceptibility $4πχ$ becomes smaller than -3/4. This behaviour can be explained by an intriguing spatial oscillation of the magnetic field in the normal layer.

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W. Belzig, C. Bruder, Yu. V. Nazarov. 2006-09-23. Overscreening Diamagnetism in Cylindrical Superconductor-Normal Metal-Heterostructures. https://doi.org/10.1007/s10909-007-9326-9

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