Overscreening Diamagnetism in Cylindrical Superconductor-Normal Metal-Heterostructures

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 $4\pi \chi$ becomes smaller than -3/4. This behaviour can be explained by an intriguing spatial oscillation of the magnetic field in the normal layer.

References in corpus (2)

• Quantum interference and supercurrent in multiple-barrier proximity structures
• Proximity-induced screening and its magnetic breakdown in mesoscopic hybrid structures

Cited by in corpus (2)

• Paramagnetic Meissner effect in voltage-biased proximity systems
• Reentrance and Magnetic-Field-Induced Superconductivity with Kondo Impurities: Bulk and Proximity Systems