Effect of the on-site Coulomb repulsion on superconductivity in the boson-fermion model

Details Effect of the on-site Coulomb repulsion on superconductivity in the boson-fermion model Effect of the on-site Coulomb repulsion on superconductivity in the boson-fermion model

2002-09-02

arxiv.org/abs/cond-mat/0209022v1

Phys. Rev. B 66, 134512 (2002).

Physics

Condensed Matter

Superconductivity

7 pages, 4 figures. Physical Review B (to appear on October the 1-st, 2002)

Scientific paper

10.1103/PhysRevB.66.134512

We study the influence of the repulsive Coulomb interactions on thermodynamic properties of the boson fermion model with an anisotropic (d-wave, and extended s-wave) order parameter. Superconductivity is induced in this model from the anisotropic charge exchange interaction between the conduction band fermions (electrons or holes) and the immobile hard-core bosons (the localized electron pairs). The on-site Coulomb repulsion competes with this pairing interaction and hence is expected to have a detrimental influence on superconductivity. We analyze this effect in some detail considering the two opposite limits of: the weak and strong repulsion. A possible crossover between both these regimes is also discussed.

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