Van Hove Singularity and Superconductivity in Disordered Hubbard Model

Details Van Hove Singularity and Superconductivity in Disordered Hubbard Model Van Hove Singularity and Superconductivity in Disordered Hubbard Model

2001-12-27

arxiv.org/abs/cond-mat/0112470v1

Physics

Condensed Matter

Superconductivity

REVTEX 40 pages, 8 figures, (accepted by Physica Status Solidi b)

Scientific paper

We apply the Coherent Potential Approximation (CPA) to a simple extended Hubbard model with a nearest and next nearest neighbour hopping for disordered superconductors with s-, d- and p-wave pairing. We show how the Van Hove singularities in the electron density of states enhance the transition temperature Tc for exotic superconductors in a clean and weakly disordered system. The Anderson theorem and pair-breaking effects in presence of Van Hove singularity caused by non-magnetic disorder are also discussed.

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