Spin gap and superconductivity in the three-dimensional attractive Hubbard model

1994/05/26 by Raimundo R dos Santos, Santos, Raimundo R dos
Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #cond-mat

paper · pdf · doi:10.48550/arxiv.cond-mat/9405078

5 pages, uuencoded PS text and figures, NC-FIS-PUC-09/93

arxiv created 1994/05/26 · arxiv updated 2009/11/30

Abstract

We study the phase diagram for the attractive (\it i.e., negative-U) Hubbard model on a simple cubic lattice, through Monte Carlo simulations. We obtain the critical temperature, T_c, for superconductivity from a finite-size scaling analysis of the data for the pairing correlations. For fixed on-site attraction, U, T_c displays a maximum near the filling factor 0.9, roughly independent of U. For fixed filling we estimate the crossover temperature T^×(U), separating the normal states: metallic and spin-gap. There is also a critical value U_p for pair formation, the magnitude of which seems to be independent of doping. The relevance of these results to the high-T_c oxides is discussed.

Related

• An investigation of the 2D attractive Hubbard model
• Effects of next-nearest neighbor hopping on the pairing and critical temperatures of the attractive Hubbard model on a square lattice
• Superconductivity in the two-dimensional Hubbard model based on the exact pair potential
• A Rigorous Demonstration of Superconductivity in a Repulsive Hubbard Model
• Transition to an insulating phase induced by attractive interactions in the disordered three-dimensional Hubbard model