Superconductivity in the SU(N) Anderson Lattice at U=\infty

Details Superconductivity in the SU(N) Anderson Lattice at U=\infty Superconductivity in the SU(N) Anderson Lattice at U=\infty

2000-07-10

arxiv.org/abs/cond-mat/0007163v2

Physics

Condensed Matter

Superconductivity

Seven Figures; one appendix. Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.62.9800

We present a mean-field study of superconductivity in a generalized N-channel cubic Anderson lattice at U=\infty taking into account the effect of a nearest-neighbor attraction J. The condition U=\infty is implemented within the slave-boson formalism considering the slave bosons to be condensed. We consider the $f$-level occupancy ranging from the mixed valence regime to the Kondo limit and study the dependence of the critical temperature on the various model parameters for each of three possible Cooper pairing symmetries (extended s, d-wave and p-wave pairing) and find interesting crossovers. It is found that the d- and p- wave order parameters have, in general, very similar critical temperatures. The extended s-wave pairing seems to be relatively more stable for electronic densities per channel close to one and for large values of the superconducting interaction J.

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