Superconductivity in Anderson Lattice Model |
| A. Romano, C. Noce Unità I.N.F.M. di Salerno -Dipartimento di Fisica Teorica e S.M.S.A., Università di Salerno, 84081 Baronissi (Salerno), Italy and R. Micnas Institute of Physics, A. Mickiewicz University, 60-769 Poznań, Poland |
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| We study the superconducting instabilities generated by the inclusion in the Anderson lattice model of a density-density attractive potential between correlated electrons on nearest-neighbouring sites. Using a description of the normal phase based on a perturbative expansion around the atomic limit, we treat the attractive potential in the broken-symmetry Hartree-Fock scheme and analyze which of the possible symmetries of the superconducting order parameter leads to the highest possible transition temperature in the case of a two-dimensional square lattice. For values of the on-site f-repulsion large compared to the hopping amplitude, a suppression of any possible superconducting phase occurs, regardless of the symmetry of the order parameter. |
| DOI: 10.12693/APhysPolA.91.381 PACS numbers: 74.72.-h, 74.70.Tx, 74.25.-q |