Magnetic interference patterns in a long SNS junction: analytical results

Details Magnetic interference patterns in a long SNS junction: analytical results Magnetic interference patterns in a long SNS junction: analytical results

2009-07-03

arxiv.org/abs/0907.0632v1

Physics

Condensed Matter

Superconductivity

9 pages, 4 figures

Scientific paper

We study a diffusive superconductor-normal metal-superconductor (SNS) junction in an external magnetic field. In the limit of a long junction, we find that the properties of such a system depend on the width of the junction relative to the length associated with the magnetic field. We compute the critical width separating the regime of pure decay (narrow junction) and the regime of damped oscillations (wide junction) of the critical current as a function of the magnetic flux through the junction. We find an exponential damping of the current, different from the well know Fraunhofer limit which corresponds to the limit of a tunnel junction. In the limit of a wide junction, the superconducting pair correlations and the critical current become localized near the border of the junction.

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