SUPERCONDUCTIVITY OF WEAKLY CORRELATED ELECTRONS IN 2-DIMENSIONAL HUBBARD LATTICE

We investigate an interplay between superconductivity and Coulomb repu lsion U in two dimensional Hubbard lattice. The correlations are taken into account in the two pole version of the mean-field-like approxima tion for the slave boson fields. The metal-insulator transition takes place for considerably smaller values of U than in the one pole formul ation. The qualitative features of the variation of superconducting tr ansition temperature with hole concentration are correctly reproduced. We argue in favour of weakly correlated p-like quasiparticles in CuO2 Planes as candidates for an underlying physical system.