We present a spectroscopic ellipsometry study of the optical anisotropies at energies above and below a crossing point at ≈2 eV in the optical conductivity of Bi1-xCaxMnO3 crystals. Below Tco, we observe a sudden increase of the low-frequency dielectric function, reflecting charge ordering. Moreover, we find a gradual development in the high-frequency dielectric function, primarily influenced by orbital effects, which suggest that fluctuations associated with short-range orbital ordering precede charge ordering.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 2000|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics