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

Abstract

We report an inelastic light scattering study of the effects of charge-ordering on the spin-, charge-, and lattice-dynamics in ${\mathrm{Bi}}_{1-x}{\mathrm{Ca}}_x{\mathrm{MnO}}_3$ $(x>0.5)$. 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.

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

References in corpus (3)

• Spin Anisotropy and Quantum Hall Effect in the Kagome Lattice - Chiral Spin State based on a Ferromagnet-
• Spin gap behavior and charge ordering in α^{\prime}-NaV_2O_5 probed by light scattering
• Electron-phonon and spin-phonon coupling in NaV${}_2$O${}_5$: charge fluctuations effect

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