Coulomb repulsion of holes and competition between \({d_{{x^2} - {y^2}}}\) -wave and s-wave parings in cuprate superconductors
- Authors: Val’kov V.V.1, Dzebisashvili D.M.1,2, Korovushkin M.M.1, Barabanov A.F.3
-
Affiliations:
- Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center,”
- Reshetnev Siberian State University of Science and Technologies
- Vereshchagin Institute of High Pressure Physics
- Issue: Vol 125, No 5 (2017)
- Pages: 810-821
- Section: Order, Disorder, and Phase Transition in Condensed System
- URL: https://journals.rcsi.science/1063-7761/article/view/191389
- DOI: https://doi.org/10.1134/S1063776117110085
- ID: 191389
Cite item
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
