Influence of disordering on the critical temperature of superconductors with a short coherence length

The influence of disordering on the critical temperature of s-wave superconductors with a short coherence length is studied by numerical simulation using the two-dimensional Hubbard model with attraction. The calculations are carried out within the Bogolyubov-De Gennes approach, which allows one to include the spatial inhomogeneity of the order parameter. The influence of the spatial inhomogeneity of physical quantities on the results obtained is studied. Disordering is shown to be able to cause a significant increase in the critical temperature. (C) 2003 MAIK Nauka / Interperiodica.