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A new model is presented for the insulator-metal transition in Eu-rich EuO: At low temperatures the electrons are only very weakly bound to oxygen vacancies and conduction is metallic; near and above T₂ the electrons localize and form bound magnetic polarons by ordering the Eu^2+ spins neighboring the vacancy, thereby gaining exchange energy. Magnetic-susceptibility data are presented which support this model.
Torrance et al. (Mon,) studied this question.
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