On the theory of superconductivity in the extended Hubbard model

Spin-fluctuation pairing
Regular Article

DOI: 10.1140/epjb/e2013-31157-6

Cite this article as:
Plakida, N.M. & Oudovenko, V.S. Eur. Phys. J. B (2013) 86: 115. doi:10.1140/epjb/e2013-31157-6

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 Tc by taking into account the pairing mediated by charge and spin fluctuations and phonons. We found the d-wave pairing with high-Tc 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.

Keywords

Solid State and Materials 

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Joint Institute for Nuclear ResearchDubnaRussia
  2. 2.Max-Planck-Institut für Physik komplexer SystemeDresdenGermany
  3. 3.Rutgers UniversityNew JerseyUSA

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