Charge localization in Ti4O7 and Fe3O4 and the respective insulating states are discussed. It is concluded that the ground state in both systems is bipolaronic. The concept of such a bipolaron is discussed and the importance of elastic interaction between two localized electrons as the dominant interaction in such systems is emphasized. It is concluded that both systems above the long-range ordering temperature are to be considered as bipolaron glasses.
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B. K. Chakraverty (1980) studied this question.
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