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 each phonon peaks are also proposed.
@article{arxiv.cond-mat/0509468,
title = {Raman spectroscopy on cubic and hexagonal SrMnO$_3$},
author = {A. Sacchetti and M. Baldini and P. Postorino and C. Martin and A. Maignan},
journal= {arXiv preprint arXiv:cond-mat/0509468},
year = {2007}
}
Comments
5 pages, 5 figures, 3 tables, submitted to Journal of Raman Spectroscopy