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Pseudogap in cuprate and organic superconductors

By J. Merino and O. Gunnarsson

Abstract

We study the pseudogap present in cuprate and organic superconductors. We use the dynamical cluster approximation (DCA), treating a cluster embedded in a bath. As the Coulomb interaction is increased, cluster-bath Kondo states are destroyed and bound cluster states formed. We show that this leads to a pseudogap. Due to weaker coupling to the bath for the anti-nodal point, this happens first for this point, explaining the k-dependence of the pseudogap. The pseudogap can be understood in terms of preformed d-wave pairs, but it does not prove the existence of such pairs.Comment: 5 pages 4 figure

Topics: Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Superconductivity
Year: 2012
DOI identifier: 10.1016/j.physc.2012.10.009
OAI identifier: oai:arXiv.org:1208.3996
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