Abstract
Raman scattering has been investigated for a single crystal of Sm1-xSrxMnO3 (x = 0.45), which shows prototypical colossal magnetoresistance (CMR), and related crystals. The emergence of broad phonon bands indicates dynamical charge/orbital correlation above the Curie temperature. Such a feature is systematically enhanced with a decrease of one-electron band width toward the orbital order-disorder phase boundary, being concomitant with the enhancement of CMR. The charge/orbital correlation affected by charge/orbital ordering instability is likely to be responsible for the steep insulator-metal transition and CMR.
Original language | English |
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Pages (from-to) | 170-172 |
Number of pages | 3 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 239 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 2002 Feb 1 |
Keywords
- Colossal magnetoresistance
- Manganese oxides
- Raman scattering
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics