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

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

1996-02-23

arxiv.org/abs/supr-con/9602002v1

Physics

Condensed Matter

Superconductivity

Uuencoded LaTeX file anf 6 Postscript figures (14 pages). Accepted for publication in Physica C

Scientific paper

10.1016/0921-4534(96)00052-4

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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