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Journal of Low Temperature Physics

, Volume 196, Issue 1–2, pp 242–252 | Cite as

Influence of the Coulomb Repulsions on the Formation of the Superconducting Gap of the Spin-Polaron Quasiparticles in Cuprates

  • V. V. Val’kov
  • M. M. KorovushkinEmail author
  • A. F. Barabanov
Article
  • 28 Downloads

Abstract

Taking into account the real crystalline structure of the \(\hbox {CuO}_2\) plane and the strong spin-fermion coupling, the influence of the on-site Coulomb repulsion of holes \(U_p\) and the intersite Coulomb repulsion \(V_2\) between holes located at the next-nearest-neighbor oxygen ions on the formation of the superconducting gap with the d-wave symmetry of the order parameter of the spin-polaron quasiparticles is studied. It is shown that the formation of the resulting superconducting gap within the spin-fermion model is caused by three components. The dependence of the narrowing of the superconducting gap on the values \(U_p\) and \(V_2\) is analyzed.

Keywords

Cuprate superconductors Unconventional superconductivity Spin-charge correlations Spin polarons Intersite Coulomb interaction 

Notes

Acknowledgements

The work was supported by the program of the Presidium of the Russian Academy of Sciences No. 12 “Fundamental problems of high-temperature superconductivity,” the Russian Foundation for Basic Research (Projects Nos. 16-02-00304 and 18-02-00837) and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (Projects Nos. 18-42-243002 “Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors” and 18-42-243018 “Contact phenomena and magnetic disorder in the problem of the formation and detection of topological edge states in semiconductor nanostructures”), and the grant of the President of the Russian Federation (Project MK-1398.2017.2).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • V. V. Val’kov
    • 1
  • M. M. Korovushkin
    • 1
    Email author
  • A. F. Barabanov
    • 2
  1. 1.Kirensky Institute of Physics, Federal Research Center KSC SB RASKrasnoyarskRussia
  2. 2.Vereshchagin Institute for High Pressure PhysicsTroitsk, MoscowRussia

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