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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 Tc the electrons localize and form bound magnetic polarons by ordering the Eu²⁺ spins neighboring the vacancy, thereby gaining exchange energy. Magnetic-susceptibility data are presented which support this model.
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Torrance et al. (1972) studied this question.
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