Raman spectroscopy on cubic and hexagonal SrMnO3

We report on the first optical characterization of both cubic and hexagonal SrMnO3. Room-temperature Raman spectra collected by means of a micro-Raman spectrometer are shown. The spectrum of the cubic compound is characterized by weak and broad bands in agreement with group theory which predicts no Raman-active phonons for this compound. On the other hand, the spectrum of the hexagonal compound shows six narrow peaks ascribed to one-phonon processes. A complete polarization analysis of the spectra collected from a single crystallite allows us to completely assign the symmetries of the six observed peaks. Atomic displacements for all phonon peaks are also proposed. Copyright (C) 2006 John Wiley & Sons, Ltd.