2002/09/02 by T. Domański, T. Domanski · 1 citation
Physics and Astronomy · #Boson #Condensed matter physics #Coulomb #Electron #Fermion #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.66.134512
published as Phys. Rev. B 66, 134512 (2002). · 7 pages, 4 figures. Physical Review B (to appear on October the 1-st, 2002)
arxiv created 2002/09/02 · openalex publication_date 2002/10/10 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the influence of the repulsive Coulomb interactions on the 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.