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 tempe
Boson-exchange superconductor model with a Van Hove singularity
β Scribed by T.A. Mamedov; M. de Llano
- Book ID
- 104337492
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 103 KB
- Volume
- 257
- Category
- Article
- ISSN
- 0375-9601
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β¦ Synopsis
2 Ε½ .
A realistically-shaped electron-boson interaction Eliashberg spectrum a F v is shown to be crucial in determining superconducting transition temperatures when the Fermi-energy shift from a Van Hove saddle-point singularity lies between 2 Ε½ . the minimum and maximum boson frequencies in a F v .
π SIMILAR VOLUMES
We study the influence of a logarithmic Van Hove singularity on the electronic specific heat C e of a 2D superconductor. The theoretical results are obtained for an isotropic s-wave gap parameter or an anisotropic dx2 y2-wave gap parameter. The specific heat jump at T c observed in high-T c supercon