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From double exchange to superexchange in charge-ordering perovskite manganites
Journal article   Peer reviewed

From double exchange to superexchange in charge-ordering perovskite manganites

Wei Bao, J.D Axe, C.H Chen, S.-W Cheong, P Schiffer and M Roy
Physica. B, Condensed matter, Vol.241, pp.418-420
1997
DOI: https://doi.org/10.1016/S0921-4526(97)00607-8

Abstract

Charge ordering Colossal magnetoresistance Double exchange Paramagnetic fluctuations
We 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. Our results indicate that the double-exchange mechanism is turned off by electron localization at low temperatures.

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