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Title: High temperature superconductivity and charge segregation in a model with strong long-range electron-phonon and Coulomb interactions
Authors: Alexandrov, A.S.
Kornilovitch, P.E.
Keywords: Superconductivity
Strongly correlated electrons
Issue Date: 2001
Citation: ALEXANDROV, A.S. and KORNILOVITCH, P.E., 2002. High-temperature superconductivity and charge segregation in a model with strong long-range electron–phonon and Coulomb interactions. Physics Letters A, 299, (5–6), pp. 650–655.
Abstract: An analytical method of studying strong long-range electron–phonon and Coulomb interactions in complex lattices is presented. The method is applied to a perovskite layer with anisotropic coupling of holes to the vibrations of apical atoms. Depending on the relative strength of the polaronic shift Ep and the inter-site Coulomb repulsion Vc, the system is either a polaronic Fermi liquid, Vc>1.23Ep, a bipolaronic superconductor, 1.16Ep<Vc<1.23Ep, or a charge segregated insulator, Vc<1.16Ep. In the superconducting window, the carriers are mobile bipolarons with a remarkably low effective mass. The model describes the key features of the underdoped superconducting cuprates.
Description: This article was submitted for publication in the journal, Physics Letters A [© Elsevier] and the definitive version is available at: http://dx.doi.org/10.1016/S0375-9601(02)00684-9
DOI: 10.1016/S0375-9601(02)00684-9
URI: https://dspace.lboro.ac.uk/2134/1159
Publisher Link: http://dx.doi.org/10.1016/S0375-9601(02)00684-9
Appears in Collections:Published Articles (Physics)

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