Enhancement of superconductivity by local inhomogeneity
arXiv:cond-mat/0501659 · doi:10.1103/PhysRevB.72.060502
Abstract
We study the effect of inhomogeneity of the paring interaction or the background potential on the superconducting transition temperature, T_c. In the weak coupling BCS regime, we find that inhomogeneity which is incommensurate with the Fermi surface nesting vectors enhances T_c relative to its value for the uniform system. For a fixed modulation strength we find that the highest T_c is reached when the characteristic modulation length scale is of the order of the superconducting coherence length.
4 pages, 1 eps figure