Raman scattering spectra have been investigated for a single crystal of Sm1-xSrxMnO3 (x = 0.45) showing prototypical colossal magnetoresistance (CMR). The emergence of broad phonon bands above the Curie temperature Tc is ascribed to dynamical charge/orbital ordering coupled with local lattice distortion, while concomitant anisotropic diffuse scattering to directional ordering of orbital. The temperature-dependent Raman spectral features can be closely correlated with the resistive and magnetic anomalies as well as the X-ray diffuse scattering peak around Tc of this compound, verifying an important role of the orbital correlation in the CMR.
- Charge/orbital ordering
- Colossal magnetoresistance (CMR)
- Raman scattering
ASJC Scopus subject areas
- Physics and Astronomy(all)