Physics – Condensed Matter – Superconductivity
Scientific paper
2003-01-13
Phys. Rev. B 67, 144501 (2003)
Physics
Condensed Matter
Superconductivity
7 pages, 5 Eps figures; replaced with revised version
Scientific paper
10.1103/PhysRevB.67.144501
We study the effect of superconducting fluctuations on the upper critical field of a disordered superconducting film at low temperatures. The first order fluctuation correction is found explicitly. In the framework of the perturbative analysis, superconducting fluctuations are shown to shift the upper critical field line toward lower fields and do not lead to an upward curvature. Higher order corrections to the quadratic term coefficient in the Ginzburg-Landau free energy functional are studied. We extract a family of the mostly divergent diagrams and formulate a general rule of calculating a diagram of an arbitrary order. We find that the singularity gets more severe with increasing perturbation theory order. We conclude that the renormalization of the Ginzburg-Landau coefficients by superconducting fluctuations is an essentially non-perturbative effect. As a result, the genuine transition line may be strongly shifted from the classical mean-field curve in a two-dimensional superconductor.
Galitski Victor
Sarma Sankar Das
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