Magnetic Interference Patterns and Vortices in Diffusive SNS junctions

Abstract

We study theoretically the electronic and transport properties of a diffusive superconductor-normal metal-superconductor (SNS) junction in the presence of a perpendicular magnetic field. We show that the field dependence of the critical current crosses over from the well-known Fraunhofer pattern in wide junctions to a monotonous decay when the width of the normal wire is smaller than the magnetic length ξ_H = \sqrt{Φ_0/H}, where H is the magnetic field and Φ_0 the flux quantum. We demonstrate that this behavior is a direct consequence of the magnetic vortex structure appearing in the normal region and predict how such structure is manifested in the local density of states.

6 pages, 3 figures

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• Bipolar supercurrent in graphene
• Novel Circuit Theory of Andreev Reflection
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• Density of states and supercurrent in diffusive SNS junctions: role of nonideal interfaces and spin-flip scattering
• Coherent transport and nonlocality in mesoscopic SNS junctions: anomalous magnetic interference patterns
• Nonlocality in mesoscopic Josephson junctions with strip geometry
• Minigap in a SN junction with paramagnetic impurities

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