LOCALIZATION EFFECTS ON MAGNETIC EXCITATIONS, COULOMB REPULSION, AND CRITICAL-TEMPERATURE IN A QUASI-3D SUPERCONDUCTOR

Using the Eliashberg equations for superconductivity in a quasi-3D hig h-temperature superconductor, taking into consideration the (q) over b ar-dependent phonon-mediated electron-electron interaction, the effect of the disordered magnetic correlations, and Coulomb repulsion affect ed by disorder, we calculated the expression for the critical temperat ure. The phonon and the magnetic kernels have a logarithmic divergence and the critical temperature differs from the McMillan form. The Coul omb repulsion in the presence of disorder has been estimated. The diso rdered magnetic correlations can decrease the critical temperature or can suppress the superconductivity. The effect of various parameters o n the decrease of the critical temperature has been analyzed.