Anisotropic optical signatures of orbital and charge ordering

M. Rübhausen, S. Yoon, S. Cooper, K. Kim, S. W. Cheong

Research output: Contribution to journalArticlepeer-review


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 languageEnglish (US)
Pages (from-to)R4782-R4785
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number8
StatePublished - 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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