1201.5748 (Teet Örd et al.)

Critical and non-critical coherence lengths in a two-band superconductor    [PDF]

Teet Örd, Küllike Rägo, Artjom Vargunin

We study the peculiarities of coherency in a two-gap superconductor. The both
intraband couplings, inducing superconductivity in the independent bands, and
interband pair-transfer interaction have been taken into account. On the basis
of the Ginzburg-Landau equations derived from the Bogoliubov-de Gennes
equations and the relevant self-consistency conditions for a two-gap system, we
find critical and non-critical coherence lengths in the spatial behaviour of
the fluctuations of order parameters. The character of the temperature
dependencies of these length scales is determined by the relative contributions
from intra- and interband interaction channels.

View original: http://arxiv.org/abs/1201.5748