The gap symmetry is marginal in high-Tc superconductivity: Isotropic s-wave pairing leads to either s or d-wave gap depending on the Coulomb pseudopotential

1995/11/30 by G. Varelogiannis, Varelogiannis, G.
Engineering · Materials Science · Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #cond-mat

paper · pdf · doi:10.48550/arxiv.cond-mat/9511139

Submitted for publication some weeks ago, four pages revtex, four figures available upon request to [email protected]

arxiv created 1995/11/30 · openalex publication_date 1995/11/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We point out that in two-dimensional systems like high-T_c superconductors, an isotropic s-wave electron-phonon interaction in the momentum decoupling regime leads to either s or d-wave superconductivity depending on the conventional values of the Coulomb pseudopotential. It is therefore possible that YBa₂Cu₃O₇ is an anisotropic d-wave and Bi₂Sr₂CaCu₂O₈ an anisotropic s-wave superconductor both having the same pairing interaction and similar T_c's. A transition from s-wave to d-wave superconductivity may also be possible by adjusting the doping.

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