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On the theory of superconductivity in the extended Hubbard model

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  • Nikolay Plakida
  • Viktor Oudovenko

Abstract

A microscopic theory of superconductivity in the extended Hubbard model which takes into account the intersite Coulomb repulsion and electron-phonon interaction is developed in the limit of strong correlations. The Dyson equation for normal and pair Green functions expressed in terms of the Hubbard operators is derived. The self-energy is obtained in the noncrossing approximation. In the normal state, antiferromagnetic short-range correlations result in the electronic spectrum with a narrow bandwidth. We calculate superconducting T c by taking into account the pairing mediated by charge and spin fluctuations and phonons. We found the d-wave pairing with high-T c mediated by spin fluctuations induced by the strong kinematic interaction for the Hubbard operators. Contributions to the d-wave pairing coming from the intersite Coulomb repulsion and phonons turned out to be small. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Suggested Citation

  • Nikolay Plakida & Viktor Oudovenko, 2013. "On the theory of superconductivity in the extended Hubbard model," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 86(3), pages 1-15, March.
    • Handle: RePEc:spr:eurphb:v:86:y:2013:i:3:p:1-15:10.1140/epjb/e2013-31157-6
    DOI: 10.1140/epjb/e2013-31157-6
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    Solid State and Materials;

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