Impact of Charge Ordering on Magnetic Correlations in Perovskite (Bi,Ca)MnO_3

Details Impact of Charge Ordering on Magnetic Correlations in Perovskite (Bi,Ca)MnO_3 Impact of Charge Ordering on Magnetic Correlations in Perovskite (Bi,Ca)MnO_3

1996-11-13

arxiv.org/abs/cond-mat/9611110v1

Phys. Rev. Lett., vol. 78, 543-546 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 3 figures, Revtex

Scientific paper

10.1103/PhysRevLett.78.543

Single crystalline (Bi,Ca)MnO3 (74< %Ca <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 e_g electrons in these insulating materials, nevertheless, induce ferromagnetic interaction through double-exchange mechanism. It is the ordering of these charges competing with the double-exchange ferromagnetic metallic state.

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