Impact of charge ordering on magnetic correlations in perovskite (Bi, Ca)MnO3

Wei Bao, J. D. Axe, C. H. Chen, S. W. Cheong

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224 Scopus citations


Single crystalline Bi1−xCaxMnO3 (0.74≤x≤0.82) were studied with neutron scattering, electron diffraction, and bulk magnetic measurement. We discovered dynamic ferromagnetic spin correlations at high temperatures, which are replaced by antiferromagnetic spin fluctuations at a concomitant charge ordering and structural transition. Our results indicate that thermal-activated hopping of the Jahn-Teller active eg electrons in these insulating materials, nevertheless, induces ferromagnetic interaction through the double-exchange mechanism. It is the ordering of these charges which competes with the double-exchange ferromagnetic metallic state.

Original languageEnglish (US)
Pages (from-to)543-546
Number of pages4
JournalPhysical review letters
Issue number3
StatePublished - Jan 20 1997

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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