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Pseudogap in cuprate and organic superconductors

By J. Merino and O. Gunnarsson


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
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