2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/121746We propose a simple model for superconductors endowed with two critical temperatures, corresponding to two second-order phase transitions, in the framework of the Ginzburg-Landau mean-field theory. For very large Cooper pair self-interaction, in addition to the standard condensation occurring in the Ginzburg-Landau theory, we find another phase transition at a lower temperature with a maximum difference of 15% between the two critical temperatures.revtex, 3 pages, one eps figureSuperconductivityHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext