We have succeeded for the first time in preparing single crystalline films of SrFeO3, CaFeO3, and Sr2FeCoO6, perovskites containing Fe4+, at low oxygen pressure of only 1 kPa, and the dominance of oxygen hole character in transport phenomena was indicated by the positive Hall coefficient of metallic SrFeO3.
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Hayashi et al. (2001) studied this question.
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