Raman spectroscopy on cubic and hexagonal SrMnO$_3$

Details Raman spectroscopy on cubic and hexagonal SrMnO$_3$ Raman spectroscopy on cubic and hexagonal SrMnO$_3$

2005-09-19

arxiv.org/abs/cond-mat/0509468v1

J Raman Spectrosc 37, 591 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, 3 tables, submitted to Journal of Raman Spectroscopy

Scientific paper

10.1002/jrs.1484

We report on the first optical characterization of both cubic and hexagonal SrMnO$_3$. 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.

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