Coulomb repulsion of holes and competition between $${d_{{x^2} - {y^2}}}$$ d x 2 − y 2 -wave and s-wave parings in cuprate superconductors
| Autor: | M. M. Korovushkin, A. F. Barabanov, V. V. Val’kov, D. M. Dzebisashvili |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Solid-state physics General Physics and Astronomy 01 natural sciences Integral equation 010305 fluids & plasmas symbols.namesake Fourier transform Condensed Matter::Superconductivity Pairing 0103 physical sciences Quasiparticle symbols Coulomb Condensed Matter::Strongly Correlated Electrons Cuprate 010306 general physics |
| Zdroj: | Journal of Experimental and Theoretical Physics. 125:810-821 |
| ISSN: | 1090-6509 1063-7761 |
| Popis: | 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 V q does not appear in the kernel of the corresponding integral equation. |
| Databáze: | OpenAIRE |
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