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A general interpolation scheme for thermal fluctuations in superconductors

L. Marotta·M. Camarda·G. G. N. Angilella·F. Siringo
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Abstract

We present a general interpolation theory for the phenomenological effects of thermal fluctuations in superconductors. Fluctuations are described by a simple gauge invariant extension of the gaussian effective potential for the Ginzburg-Landau static model. The approach is shown to be a genuine variational method, and to be stationary for infinitesimal gauge variations around the Landau gauge. Correlation and penetration lengths are shown to depart from the mean field behaviour in a more or less wide range of temperature below the critical regime, depending on the class of material considered. The method is quite general and yields a very good interpolation of the experimental data for very different materials.

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L. Marotta, M. Camarda, G. G. N. Angilella, F. Siringo. 2006-02-12. A general interpolation scheme for thermal fluctuations in superconductors. https://doi.org/10.1103/physrevb.73.104517

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