Anisotropic Pairing on a Three-Band Fermi Surface for $A_3{\rm C}_{60}$

Details Anisotropic Pairing on a Three-Band Fermi Surface for $A_3{\rm C}_{60}$ Anisotropic Pairing on a Three-Band Fermi Surface for $A_3{\rm C}_{60}$

1992-09-11

arxiv.org/abs/cond-mat/9209011v1

Physics

Condensed Matter

11 pages + 3 figs

Scientific paper

10.1103/PhysRevB.47.2948

We study a model for anisotropic singlet pairing in $A_3{\rm C}_{60}$, using a realistic model for the Fermi surface in a hypothesized orientationally-ordered doped crystal. Anisotropic solutions are studied by combining numerical solutions to the gap equation in the low-temperature phase with a Landau expansion near the mean field critical temperature. We focus on a class of three-dimensional nodeless $d$-wave solutions to the model, which exhibit a fully developed gap everywhere on the Fermi surface, but non-BCS temperature dependence of the order parameter in the condensed state, a relatively large value of the low-temperature gap, $2\Delta/kT_{\rm c}$ , and non-BCS structure in the quasiparticle spectrum near the gap.

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