Superconductivity in Anderson Lattice Model

• Authors: A. Romano , C. Noce , R. Micnas
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

74.72.-h; 74.70.Tx; 74.25.-q

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1997
• Volume: 91
• Issue: 2
• Pages: 381-385

Dates

published

1997-02

Contributors

author

A. Romano

• Unità I.N.F.M. di Salerno -Dipartimento di Fisica Teorica e S.M.S.A., Università di Salerno, 84081 Baronissi (Salerno), Italy

author

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

author

R. Micnas

• Institute of Physics, A. Mickiewicz University, 60-769 Poznań, Poland