Raman scattering study of anomalous charge-, spin-, and lattice-dynamics in the charge-ordered phase of ${\bf Bi}_{1-x}{\bf Ca}_x{\bf MnO}_3$ ($x>0.5$)

Details Raman scattering study of anomalous charge-, spin-, and lattice-dynamics in the charge-ordered phase of ${\bf Bi}_{1-x}{\bf Ca}_x{\bf MnO}_3$ ($x>0.5$) Raman scattering study of anomalous charge-, spin-, and lattice-dynamics in the charge-ordered phase of ${\bf Bi}_{1-x}{\bf Ca}_x{\bf MnO}_3$ ($x>0.5$)

2000-03-15

arxiv.org/abs/cond-mat/0003250v2

Physics

Condensed Matter

Strongly Correlated Electrons

to be published in Phys. Rev. Lett. (Oct. 2000)

Scientific paper

10.1103/PhysRevLett.85.3297

We report an inelastic light scattering study of the effects of charge-ordering on the spin-, charge-, and lattice-dynamics in ${\rm Bi}_{1-x}{\rm Ca}_{x}{\rm MnO}_3$ $(x>0.5)$. We find that charge-ordering results in anomalous phonon behavior, such as the appearance of `activated' modes. More significantly, however, the transition to the CO phase results in the appearance of a quasielastic scattering response with the symmetry of the spin chirality operator ($T_{1g}$); this scattering response is thus indicative of magnetic or chiral spin fluctuations in the AFM charge-ordered phase.

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