Infrared phonon anomalies and orbital ordering in single-crystalline MnV2O4 
spinel

Myung-Whun, K.; Jang, S. Y.; Katsufuji, T.; Boris, A. V.

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Infrared phonon anomalies and orbital ordering in single-crystalline MnV₂O₄ spinel

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Boris, A. V.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Myung-Whun, K., Jang, S. Y., Katsufuji, T., & Boris, A. V. (2012). Infrared phonon anomalies and orbital ordering in single-crystalline MnV₂O₄ spinel. Physical Review B, 85(22): 224423.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C305-0

Abstract

We used infrared ellipsometry to study phonons in a spinel MnV2O4 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.