2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28398Recent experimental data for the overdoped LSCO have firmly established the properties which characterize the transition between the superconducting and the Fermi liquid metallic phases. The thermodynamic response functions show a pronounced feature at this point, while the Fermi surface undergoes a dramatic change. By use of the Composite Operator Method for the two-dimensional Hubbard model, it is found that the presence of a van Hove singularity in the lower Hubbard band can explain these behaviors.3 pages, RevTeX, 4 PostScript figures, submitted to Solid State CommunicationsSuperconductivityStrongly Correlated Electronstext