TY - JOUR
T1 - Change of phonon Raman spectra with v trimerization in BaV 10O 15
AU - Kanzaki, T.
AU - Kubota, R.
AU - Katsufuji, T.
PY - 2012/4/13
Y1 - 2012/4/13
N2 - We investigated Raman scattering of BaV 10O 15, which exhibits a structural phase transition with V trimerization at T c=123K possibly dominated by the orbital ordering of V t 2g states. It was found that phonon Raman spectra drastically change at T c. According to the analysis of the phonon spectra based on the bond-polarizability model, the force constant of the V-V bond increases by 75% and the peak width is reduced by half below T c. This result can be explained by the existence of disorder originating from orbital degrees of freedom above T c, which is suppressed by the long-range orbital ordering below T c.
AB - We investigated Raman scattering of BaV 10O 15, which exhibits a structural phase transition with V trimerization at T c=123K possibly dominated by the orbital ordering of V t 2g states. It was found that phonon Raman spectra drastically change at T c. According to the analysis of the phonon spectra based on the bond-polarizability model, the force constant of the V-V bond increases by 75% and the peak width is reduced by half below T c. This result can be explained by the existence of disorder originating from orbital degrees of freedom above T c, which is suppressed by the long-range orbital ordering below T c.
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U2 - 10.1103/PhysRevB.85.144410
DO - 10.1103/PhysRevB.85.144410
M3 - Article
AN - SCOPUS:84860280302
SN - 1098-0121
VL - 85
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 14
M1 - 144410
ER -