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Temperature‐dependent Raman scattering study of multiferroic MnWO 4
Author(s) -
Hoang Luc Huy,
Hien Nguyen T. M.,
Choi W. S.,
Lee Y. S.,
Taniguchi K.,
Arima T.,
Yoon S.,
Chen X. B.,
Yang InSang
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2542
Subject(s) - raman spectroscopy , phonon , raman scattering , wavenumber , chemistry , condensed matter physics , octahedron , multiferroics , materials science , crystal structure , crystallography , physics , optics , ferroelectricity , optoelectronics , dielectric
We have measured polarized Raman spectra of MnWO 4 single crystals at low temperatures, and studied the temperature dependence of the various phonon modes. From our Raman studies of the MnWO 4 , a new transition temperature, ∼180 K, was found. We have completely assigned the symmetries of the 18 observed Raman modes of the MnWO 4 , 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 B g 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‐WO 6 octahedra structure. Copyright © 2009 John Wiley & Sons, Ltd.