2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/27888The phase diagram of doped manganate compounds La_{1-x}A_xMnO_3 (with divalent A) is studied. We analyze an extension of the double exchange model using the Schwinger boson formalism. Earlier work by de Gennes on the existence of a canted phase is reproduced, although this phase is shown to be unstable towards phase separation in a broad regime of physical interest. We numerically solve the model's mean field equations and plot its phase diagram.6 pages, 3 encapsulated PostScript figuresStrongly Correlated ElectronsMaterials Sciencetext