Tc enhancement due to anisotropy in the pairing interaction.

M. T. Béal-Monod, O. T. Valls

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Abstract

We give a simple demonstration that anisotropy (of arbitrary strength) in the pairing interaction (of arbitrary origin) always enhances the superconducting temperature Tc, thanks to a general theorem in matrix theory. Moreover, such an anisotropic interaction also gives rise to different partial-wave pairings than in the corresponding isotropic cases. A particular example, treated rigorously in the weak-coupling regime, explicitly exhibits, depending on the anisotropy parameters, either singlet pairing (as an admixture of s (l - 0) and d (1 = 2) waves), or triplet (l = 1) pairings. We discuss the possible implications of our results for actual physical systems as well as their plausible link with d-wave pairing often invoked for high-Tc materials.

Original languageEnglish (US)
Pages (from-to)415-420
Number of pages6
JournalEPL
Volume30
Issue number7
DOIs
StatePublished - Jun 1 1995

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