Lattice Distortions and Charge Carriers in Cuprates |
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Authors: | Lev P Gor'kov |
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Affiliation: | (1) NHMFL, Florida State University, Tallahassee, Florida, 32310 |
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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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Keywords: | Lattice effects in cuprates local states hybridization pseudogap charge phase separation |
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