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Temperature-dependent Raman scattering study of multiferroic MnWO4

Title
Temperature-dependent Raman scattering study of multiferroic MnWO4
Authors
Hoang L.H.Hien N.T.M.Choi W.S.Lee Y.S.Taniguchi K.Arima T.Yoon S.Chena X.B.Yang I.-S.
Ewha Authors
양인상윤석현Xiang Bai Chen
SCOPUS Author ID
양인상scopus; 윤석현scopus
Issue Date
2010
Journal Title
Journal of Raman Spectroscopy
ISSN
0377-0486JCR Link
Citation
vol. 41, no. 9, pp. 1005 - 1010
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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 Mg-O 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. © 2009 John Wiley & Sons, Ltd.
DOI
10.1002/jrs.2542
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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