Temperature-dependent Raman scattering study of multiferroic MnWO4
Article first published online: 20 NOV 2009
Copyright © 2009 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 41, Issue 9, pages 1005–1010, September 2010
How to Cite
Hoang, L. H., Hien, N. T. M., Choi, W. S., Lee, Y. S., Taniguchi, K., Arima, T., Yoon, S., Chen, X. B. and Yang, I.-S. (2010), Temperature-dependent Raman scattering study of multiferroic MnWO4. J. Raman Spectrosc., 41: 1005–1010. doi: 10.1002/jrs.2542
- Issue published online: 14 SEP 2010
- Article first published online: 20 NOV 2009
- Manuscript Accepted: 23 SEP 2009
- Manuscript Received: 3 APR 2009
- Korean Government. Grant Number: 2009-0063320
- MnWO4 single crystals;
- Raman scattering;
- transition temperature
We have measured polarized Raman spectra of MnWO4 single crystals at low temperatures, and studied the temperature dependence of the various phonon modes. From our Raman studies of the MnWO4, a new transition temperature, ∼180 K, was found. We have completely assigned the symmetries of the 18 observed Raman modes of the MnWO4, as expected from a group theoretical analysis. These Raman modes have been classified into three groups according to weak, intermediate and strong temperature dependence of the modes in each group. Six internal modes have been identified by their weak temperature dependence of the Raman wavenumbers. The temperature dependence of the wavenumbers of the Bg modes in MgO bonds, modes of intermediate temperature dependence group, shows an anomalous behavior under 50 K. The phonon modes of strong temperature dependence show an anomalous change at ∼180 K in the linewidths. This is believed to be a new transition temperature which involves the changes in the inter-WO6 octahedra structure. Copyright © 2009 John Wiley & Sons, Ltd.