1997•Physica B Condensed MatterOpen access
From double exchange to superexchange in charge-ordering perovskite manganites
Wei Bao, J. D. Axe, C.H Chen, S.-W. Cheong, P. Schiffer, M. Roy
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Abstract
The authors found dynamic ferromagnetic correlations at the room temperature in perovskite manganites which have an antiferromagnetic insulating ground state. They are replaced by antiferromagnetic correlations when the electrons order. The results indicate that the double exchange mechanism is turned off by electron localization at low temperatures.