Investigation of phonon behavior in Pr 2 NiMnO 6 by micro-Raman spectroscopy

TitleInvestigation of phonon behavior in Pr 2 NiMnO 6 by micro-Raman spectroscopy
Publication TypeJournal Article
Year of Publication2011
AuthorsTruong, KD, Singh, MP, Jandl, S, Fournier, P
JournalJournal of Physics: Condensed Matter
Volume23
Pagination052202
Abstract
The temperature dependence of phonon excitations and the presence of spin‚ phonon coupling in polycrystalline Pr 2 NiMnO 6 samples were studied using micro-Raman spectroscopy and magnetometry. Magnetic properties show a single ferromagnetic-to-paramagnetic transition at 228¬ K and a saturation magnetization close to 4.95¬ ¬µ B /f.u. Three distinct Raman modes at 657, 642, and 511¬ cm ‚à{\'ı 1 are observed. The phonon excitations show a clear hardening due to anharmonicity from 300 down to 10¬ K. Further, the temperature dependence of the657¬ cm ‚à{\'ı 1 mode shows only a small softening. This reflects the presence of a relatively weak spin‚ phonon coupling in Pr 2 NiMnO 6 contrary to the case for other double perovskites previously studied.
URLhttp://stacks.iop.org/0953-8984/23/i=5/a=052202
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