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.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2012 Jun 20|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics