The Upper Critical Field in Disordered Two-Dimensional Superconductors

Details The Upper Critical Field in Disordered Two-Dimensional Superconductors The Upper Critical Field in Disordered Two-Dimensional Superconductors

1999-08-28

arxiv.org/abs/cond-mat/9908427v1

Physics

Condensed Matter

Superconductivity

11 pages, 8 figures

Scientific paper

10.1103/PhysRevB.61.6352

We present calculations of the upper critical field in superconducting films as a function of increasing disorder (as measured by the normal state resistance per square). In contradiction to previous work, we find that there is no anomalous low-temperature positive curvature in the upper critical field as disorder is increased. We show that the previous prediction of this effect is due to an unjustified analytical approximation of sums occuring in the perturbative calculation. Our treatment includes both a careful analysis of first-order perturbation theory, and a non-perturbative resummation technique. No anomalous curvature is found in either case. We present our results in graphical form.

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