2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27696We argue that colossal magnetoresistance is a critical phenomenon and propose a mechanism to describe it. The mechanism relies on the halfmetallic behavior of the materials showing colossal magnetoresistance, and yields a correlated percolation model that, we argue, captures all qualitative features of colossal magnetoresistance, above as well as below the Curie temperature. The model only serves for revealing the underlying mechanism of colossal magnetoresistance, and does not aim to reproduce precise, numerical results.7 pages, REVTeX, 4 figures includedCondensed Mattertext