Specific Heat of Disordered Superconductors Induced by Negative Centers
arXiv:cond-mat/0312665 · doi:10.1016/j.jmmm.2003.12.437
Abstract
We show that superconductors with inhomogeneous order parameters can show similar features as anisotropic ones. In this paper we study the low temperature specific heat dependence in such a system and we show that the disorder associated with randomly distributed attractive centers convert the BCS temperature exponential behaviour into a power law formula. To describe superconductivity we used a random version of the negative U Hubbard model, while the disorder was treated by means of the Coherent Potential Approximation (CPA).
2 pages, 3 figures, to apear in Journal of Magnetism and Magnetic Materials