Investigation of phonon behavior in Pr2NiMnO6 by micro-Raman spectroscopy

Details Investigation of phonon behavior in Pr2NiMnO6 by micro-Raman spectroscopy Investigation of phonon behavior in Pr2NiMnO6 by micro-Raman spectroscopy

2011-01-14

arxiv.org/abs/1101.2805v1

Journal of Physics:Condensed Matter 23, 052502 (2011)

Physics

Condensed Matter

Materials Science

10 pages, 4 figs

Scientific paper

10.1088/0953-8984/23/5/052202

The temperature dependence of phonon excitations and the presence of spin phonon coupling in polycrystalline Pr2NiMnO6 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 \muB/f.u.. Three distinct Raman modes at 657, 642, and 511 cm-1 are observed. The phonon excitations show a clear hardening due to anharmonicity from 300 K down to 10 K. Further, temperature dependence of the 657 cm-1 mode shows only a small softening. This reflects the presence of a relatively weak spin-phonon coupling in Pr2NiMnO6 contrary to other double perovskites previously studied.

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