Theory of fluctuations in a two-band superconductor
A. E. Koshelev, A. A. Varlamov, V. M. Vinokur
Abstract
A theory of fluctuations in two-band superconductor MgB2 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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