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We demonstrate by means of first-principles calculations that the high Curie temperature observed in Cr-doped In 2 O 3 is mediated by intrinsic p-type defects, namely In vacancies or O interstitials. Charge transfer from Cr 3d states to the hole states formed by these defects makes Cr ions in the mixed valence state, giving rise to a strong ferromagnetic coupling. Calculated formation...
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