Abstract
We develop a theory for the simultaneous para-to-ferromagnetic and semiconductor to metal transition in O-depleted EuO. An analysis of the total charge conservation across the transition indicates that strong Coulomb correlations in the localized O-defect states must play a crucial role. This leads to a generalized Anderson impurity model with Stoner-like magnetic correlations in the conduction band and a dilute concentration of Anderson impurities in the semiconducting gap. We solve this model using the non-crossing approximation and can explain the simultaneous phase transitions in a natural way.
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