s and d-wave symmetries of the solutions of the Eliashberg equations

G. Santi; T. Jarlborg; M. Peter; M. Weger

doi:10.1016/0921-4534(96)00052-4

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s and d-wave symmetries of the solutions of the Eliashberg equations

G. Santi·T. Jarlborg·M. Peter·M. Weger

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Abstract

We examine the different possible symmetries of the superconducting gap obtained by solving the Eliashberg equations. We consider an electron-phonon interaction in a strong coupling scenario. The Coulomb pseudopotential plays the crucial role of providing the repulsion needed to favour the d-wave symmetry. But the key parameter that allows very anisotropic solutions even with very strong coupling is the small angular range of the interaction due to predominantly electron-phonon forward scattering that is found in the high-Tc superconductors. We find both s and d-wave solutions whose stability depends mainly on the angular range of the interaction.

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G. Santi, T. Jarlborg, M. Peter, M. Weger. 1996-02-23. s and d-wave symmetries of the solutions of the Eliashberg equations. https://doi.org/10.1016/0921-4534(96)00052-4

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