Superconductivity in the SU(N) Anderson lattice at U=∞

M. A. N. Araújo; N. M. R. Peres; P. D. Sacramento; V. R. Vieira

doi:10.1103/PhysRevB.62.9800

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Superconductivity in the SU(N) Anderson lattice at U=∞

M. A. N. Araújo, N. M. R. Peres, P. D. Sacramento, V. R. Vieira

DOI 10.1103/PhysRevB.62.9800 · Physical Review B

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Abstract

We present a mean-field study of superconductivity in a generalized N-channel cubic Anderson lattice at U=∞ taking into account the effect of a nearest-neighbor attraction J. The condition U=∞ 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-, 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.