2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28205The renormalization group approach to correlated fermions is used to determine the phase diagram of the oxide cuprates modeled by the t-t' Hubbard model at the Van Hove filling. Spin-dependent interactions give rise to instabilities corresponding to ferromagnetic, antiferromagnetic and d-wave superconducting phases. Antiferromagnetism and d-wave superconductivity arise from the same interactions, and compete in the same region of parameter space.Latex, 39 pages,12 figuresSuperconductivityStrongly Correlated Electronstext