Magnetic Interference Patterns and Vortices in Diffusive SNS junctions

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Cuevas, J. C.
Bergeret, F. S.
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Abstract
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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 \xi_H = \sqrt{\Phi_0/H}, where H is the magnetic field and \Phi_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.
Comment: 6 pages, 3 figures
Keywords
Condensed Matter - Superconductivity, Condensed Matter - Mesoscale and Nanoscale Physics
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