Mesoscopic Phase Separation in Anisotropic Superconductors
Abstract
General properties of anisotropic superconductors with mesoscopic phase separation are analysed. The main conclusions are as follows: Mesoscopic phase separation can be thermodynamically stable only in the presence of repulsive Coulomb interactions. Phase separation enables the appearance of superconductivity in a heterophase sample even if it were impossible in pure-phase matter. Phase separation is crucial for the occurrence of superconductivity in bad conductors. Critical temperature for a mixture of pairing symmetries is higher than the critical temperature related to any pure gap-wave symmetry of this mixture. In bad conductors, the critical temperature as a function of the superconductivity fraction has a bell shape. Phase separation makes the single-particle energy dispersion softer. For planar structures phase separation suppresses d-wave superconductivity and enhances s-wave superconductivity. These features are in agreement with experiments for cuprates.
Cite
@article{arxiv.cond-mat/0501380,
title = {Mesoscopic Phase Separation in Anisotropic Superconductors},
author = {V. I. Yukalov and E. P. Yukalova},
journal= {arXiv preprint arXiv:cond-mat/0501380},
year = {2009}
}
Comments
Revtex file, 25 pages, 2 figures