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arXiv · 1101.2805

Investigation of phonon behavior in Pr2NiMnO6 by micro-Raman spectroscopy

K. D. Truong·M. P. Singh·S. Jandl·P. Fournier
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Abstract

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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K. D. Truong, M. P. Singh, S. Jandl, P. Fournier. 2011-01-14. Investigation of phonon behavior in Pr2NiMnO6 by micro-Raman spectroscopy. https://doi.org/10.1088/0953-8984%2F23%2F5%2F052202

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