Abstract
In this paper we present a plasmon exchange model for the occurrence of superconductivity in the cuprate superconductiors.1 We first obtain analytic experssions for the effective interaction due to the plasmon exchanges between the charge carriers (holes or electrons) in the CuO layers. Using the Eliashberg model for strong coupling superconductors, we then show that these interactions can lead to superconductivity. Our theory can explain the experimentally observed rise in Tc with the increase in the number of CuO layers per cell in the TI- and Bi-based compounds.2,3 We further show that short coherence length is essential for superconductivity at high temperatures.
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