A general interpolation scheme for thermal fluctuations in superconductors

Details A general interpolation scheme for thermal fluctuations in superconductors A general interpolation scheme for thermal fluctuations in superconductors

2005-07-25

arxiv.org/abs/cond-mat/0507577v2

Physical Review B73, 104517 (2006)

Physics

Condensed Matter

Superconductivity

some misprints have been corrected in Eq.(15),(19); more references and comments have been added

Scientific paper

10.1103/PhysRevB.73.104517

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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