Temperature-dependent Raman scattering study of multiferroic MnWO4

Luc Huy Hoang, Nguyen T.M. Hien, W. S. Choi, Y. S. Lee, K. Taniguchi, T. Arima, S. Yoon, X. B. Chena, In Sang Yang

Research output: Contribution to journalArticlepeer-review

54 Citations (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.

Original languageEnglish
Pages (from-to)1005-1010
Number of pages6
JournalJournal of Raman Spectroscopy
Volume41
Issue number9
DOIs
Publication statusPublished - 2010 Sep

Keywords

  • MnWO4
  • Multiferroics
  • Raman scattering
  • Single crystals
  • Transition temperature

ASJC Scopus subject areas

  • Materials Science(all)
  • Spectroscopy

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