Abstract
A phenomenological model with itinerant bands and local states trapped by thelattice on the Cu-sites, is discussed to describe global features ofcuprates. Relative energy positions of localized and itinerant states beingtuned (thermodynamically or by doping), the system must undergo first-orderMott metal-insulator transition. Decreasing the local level (from themetallic end of a stoichiometric compound), charge separation instabilityoccurs first before the Mott transition. Crossing and hybridization betweenlocal (flat) and itinerant bands introduce a structure in density of stateswhich may account for “pseudogap” features in cuprates. Modelresults in polaronic lattice effects and is rich enough to serve as aphenomenology of cuprates.
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Gor'kov, L.P. Lattice Distortions and Charge Carriers in Cuprates. Journal of Superconductivity 12, 9–13 (1999). https://doi.org/10.1023/A:1007744830322
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DOI: https://doi.org/10.1023/A:1007744830322