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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/1137

Title: Fröhlich-Coulomb model of high-temperature superconductivity and charge segregation in the cuprates
Authors: Alexandrov, A.S.
Kornilovitch, P.E.
Keywords: superconductivity
strongly correlated electrons
Issue Date: 2002
Abstract: We introduce a generic Fröhlich-Coulomb model of the oxides, which also includes infinite on-site (Hubbard) repulsion, and describe a simple analytical method of solving the multi-polaron problem in complex lattice structures. Two particular lattices, a zig-zag ladder and a perovskite layer, are studied. We find that depending on the relative strength of the Froehlich and Coulomb interactions these systems are either polaronic Fermi (or Luttinger)-liquids, bipolaronic superconductors, or charge segregated insulators. In the superconducting phase the carriers are superlight mobile bipolarons. The model describes key features of the cuprates such as their Tc values, the isotope effects, the normal state diamagnetism, pseudogap, and spectral functions measured in tunnelling and photoemission. We argue that a low Fermi energy and strong coupling of carriers with high-frequency phonons is the cause of high critical temperatures in novel superconductors.
Description: This is a pre-print.
URI: https://dspace.lboro.ac.uk/2134/1137
Appears in Collections:Pre-Prints (Physics)

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