TY - JOUR
T1 - Anisotropic optical signatures of orbital and charge ordering
AU - Rübhausen, M.
AU - Yoon, S.
AU - Cooper, S.
AU - Kim, K.
AU - Cheong, S. W.
PY - 2000
Y1 - 2000
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0000107263&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0000107263&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.62.R4782
DO - 10.1103/PhysRevB.62.R4782
M3 - Article
AN - SCOPUS:0000107263
SN - 1098-0121
VL - 62
SP - R4782-R4785
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 8
ER -