2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/96744We present a first study of the antiferromagnetic state in the 2D t-t'-U model at finite temperatures by the composite operator method, providing simultaneously a fully self-consistent treatment of the paramagnetic and the AF phase. Near half-filling the critical value of the Coulomb repulsion as a function of t' and the temperature dependence of the magnetization and of the internal energy per site have been studied.2 pages, 2 figuresStrongly Correlated Electronstext