2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/19237We establish a mapping of a general spin-fermion system in one dimension into a classical generalized Coulomb gas. This mapping allows a renormalization group treatment of the anisotropic Kondo chain both at and away from half-filling. We find that the phase diagram contains regions of paramagnetism, partial and full ferromagnetic order. We also use the method to analyze the phases of the Ising-Kondo chain.19 pages, 9 figuresStrongly Correlated Electronstext