Anisotropic optical signatures of orbital and charge ordering in Bi{sub 1-x}Ca{sub x}MnO{sub 3}

Journal Article · Tue Aug 15 00:00:00 EDT 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.62.R4782· OSTI ID:20217469

Ruebhausen, M ^[1]; Yoon, S ^[1]; Cooper, S L ^[1]; Kim, K H ^[2]; Cheong, S-W ^[2]

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1. Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801 (United States)
2. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 (United States)

We present a spectroscopic ellipsometry study of the optical anisotropies at energies above and below a crossing point at {approx_equal}2 eV in the optical conductivity of Bi{sub 1-x}Ca{sub x}MnO{sub 3} crystals. Below T{sub co}, 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. (c) 2000 The American Physical Society.

• OSTI ID: 20217469
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 62, Issue 8; Other Information: PBD: 15 Aug 2000; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRONIC STRUCTURE
BISMUTH OXIDES
CALCIUM OXIDES
MANGANESE OXIDES
ELLIPSOMETRY
OPTICAL PROPERTIES
DIELECTRIC PROPERTIES
CHARGE DISTRIBUTION
MAGNETORESISTANCE
EXPERIMENTAL DATA