TY - JOUR
T1 - Infrared phonon anomalies and orbital ordering in single-crystalline MnV 2O 4 spinel
AU - Myung-Whun, K.
AU - Jang, S. Y.
AU - Katsufuji, T.
AU - Boris, A. V.
PY - 2012/6/20
Y1 - 2012/6/20
N2 - We used infrared ellipsometry to study phonons in a spinel MnV 2O 4 single crystal. At 300 K, the imaginary part of the complex dielectric function spectra show four phonon peaks. Below the cubic-tetragonal structural transition temperature at 58 K, small peaks appear around the cubic modes and the number of phonons becomes more than 12. The group analysis predicted 12 infrared modes for the I4 1/a symmetry. The observed modes support the I4 1/a or lower crystal symmetry, which reflects the antiferro ordering of V3 + t 2g orbitals.
AB - We used infrared ellipsometry to study phonons in a spinel MnV 2O 4 single crystal. At 300 K, the imaginary part of the complex dielectric function spectra show four phonon peaks. Below the cubic-tetragonal structural transition temperature at 58 K, small peaks appear around the cubic modes and the number of phonons becomes more than 12. The group analysis predicted 12 infrared modes for the I4 1/a symmetry. The observed modes support the I4 1/a or lower crystal symmetry, which reflects the antiferro ordering of V3 + t 2g orbitals.
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U2 - 10.1103/PhysRevB.85.224423
DO - 10.1103/PhysRevB.85.224423
M3 - Article
AN - SCOPUS:84862663720
SN - 1098-0121
VL - 85
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 22
M1 - 224423
ER -