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Coulomb Correlations and Pseudo-gap Effects in a Pre-formed Pair Model for the Cuprates

Jiri Maly·K. Levin·D. Z. Liu
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Abstract

We extend previous work on pre-formed 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 pseudo-gap phenomena. However, charge fluctuations (via the plasmon, $ω_p$) significantly modify the collective modes and therefore the interpolation behavior. We discuss the resulting behavior of the pseudo-gap and thermodynamic quantities such as $T_c$, $χ$ and $C_v$ as a function of $ω_p$.

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Jiri Maly, K. Levin, D. Z. Liu. 1996-09-09. Coulomb Correlations and Pseudo-gap Effects in a Pre-formed Pair Model for the Cuprates. https://doi.org/10.1103/physrevb.54.r15657

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