Theory of fluctuations in a two-band superconductor
arXiv:cond-mat/0412746 · doi:10.1103/PhysRevB.72.064523
Abstract
A theory of fluctuations in two-band superconductor MgB 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.
11 pages, 2 figures, subm. to Phys. Rev. B