Coulomb correlations and pseudogap effects in a preformed pair model for the cuprates
Jiri Maly, K. Levin, D. Z. Liu
DOI 10.1103/PhysRevB.54.R15657 · Physical Review B
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Abstract
We extend previous work on preformed pair models of superconductivity to incorporate Coulomb correlation effects. For neutral systems, these models have provided a useful scheme which interpolates between BCS and Bose-Einstein condensation with increasing coupling and thereby describes some aspects of pseudogap phenomena. However, charge fluctuations (via the plasmon, ωp) significantly modify the collective modes and therefore the interpolation behavior. We discuss the resulting behavior of the pseudogap and thermodynamic quantities such as Tc, χ, and Cv as a function of ωp.
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