2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28652Feedback effects due to spin fluctuation induced precursors in the fermionic quasiparticle spectrum are taken into account in the description of a quantum critical point of itinerant spin systems. A correlation length dependent spin damping occurs, leading to a dynamical scaling with z\approx 1 which non-trivially competes with the conventional spin wave behavior. We obtain, within a one loop renormalization group approach, a quantitative explanation for the scaling behavior seen in underdoped cuprate superconductors.4 pages, 4 figuresStrongly Correlated ElectronsSuperconductivitytext