Coulomb repulsion of holes and competition between \({d_{{x^2} - {y^2}}}\) -wave and s-wave parings in cuprate superconductors


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

The effect of the Coulomb repulsion of holes on the Cooper instability in an ensemble of spin–polaron quasiparticles has been analyzed, taking into account the peculiarities of the crystallographic structure of the CuO2 plane, which are associated with the presence of two oxygen ions and one copper ion in the unit cell, as well as the strong spin–fermion coupling. The investigation of the possibility of implementation of superconducting phases with d-wave and s-wave of the order parameter symmetry has shown that in the entire doping region only the d-wave pairing satisfies the self-consistency equations, while there is no solution for the s-wave pairing. This result completely corresponds to the experimental data on cuprate HTSC. It has been demonstrated analytically that the intersite Coulomb interaction does not affect the superconducting d-wave pairing, because its Fourier transform Vq does not appear in the kernel of the corresponding integral equation.

About the authors

V. V. Val’kov

Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center,”

Author for correspondence.
Email: vvv@iph.krasn.ru
Russian Federation, Krasnoyarsk, 660036

D. M. Dzebisashvili

Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center,”; Reshetnev Siberian State University of Science and Technologies

Email: vvv@iph.krasn.ru
Russian Federation, Krasnoyarsk, 660036; Krasnoyarsk, 660037

M. M. Korovushkin

Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center,”

Email: vvv@iph.krasn.ru
Russian Federation, Krasnoyarsk, 660036

A. F. Barabanov

Vereshchagin Institute of High Pressure Physics

Email: vvv@iph.krasn.ru
Russian Federation, Troitsk, Moscow, 108840

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2017 Pleiades Publishing, Inc.