Theory of fluctuations in a two-band superconductor

Details Theory of fluctuations in a two-band superconductor Theory of fluctuations in a two-band superconductor

2004-12-30

arxiv.org/abs/cond-mat/0412746v1

Phys. Rev. B, Vol. 72, p. 064523 (2005)

Physics

Condensed Matter

Superconductivity

11 pages, 2 figures, subm. to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.72.064523

A theory of fluctuations in two-band superconductor MgB$_{2}$ is developed. Since the standard Ginzburg-Landau (GL) approach fails in description of its properties, we generalize it basing on the microscopic theory of a two-band superconductor. Calculating the microscopic fluctuation propagator, we build up the nonlocal two-band GL functional and the corresponding time-dependent GL equations. This allows us to calculate the main fluctuation observables such as fluctuation specific heat and conductivity.

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