2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/28293The photon self energy tensor in a crystal with double exchange and ferromagnetic or canting magnetic orders is analyzed at zero temperature with emphasis on the signal of the time-reversal invariance breaking. Three comparable contributions, spin susceptibility, local magnetic field and spin-orbit coupling are estimated and the prospect of their experimental detection is discussed.21 pagesStrongly Correlated Electronstext