Van Hove Singularity and Superconductivity in a Disordered Hubbard Model

✍ Scribed by G. Litak

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 294 KB
• Volume: 229
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/1521-3951(200202)229:3<1427::aid-pssb1427>3.0.co;2-0

✦ Synopsis

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 T c for exotic superconductors in a clean and weakly disordered system. The Anderson theorem and the pair-breaking effects in presence of the Van Hove singularity caused by non-magnetic disorder are also discussed.