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Pyrochlore dynamic spin-ice Pr2Sn2O7 and monoclinic Pr2Ti2O7: A comparative temperature-dependent Raman study
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DOI：10.1016/j.jssc.2011.06.022.png)
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Here we report a temperature-dependent Raman study of the pyrochlore dynamic spin-ice compound Pr2Sn2O7 and compare the results with its non-pyrochlore (monoclinic) counterpart Pr2Ti2O7. In addition to phonon modes, we observe two bands associated with electronic Raman scattering involving crystal field transitions in Pr2Sn2O7 at similar to 135 and 460 cm(-1) which couple strongly to phonons. Anomalous temperature dependence of phonon frequencies that are observed in Pyrochlore Pr2Sn2O7 are absent in monoclinic Pr2Ti2O7. This, therefore, confirms that the strong phonon-phonon anharmonic interactions, responsible for the temperature-dependent anomalous behavior of phonons, arise due to the inherent vacant sites in the pyrochlore structure. (C) 2011 Elsevier Inc. All rights reserved.
Keyword:
Pyrochlore
Raman spectroscopy
Phonon anharmonicity
Crystal-field splitting
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3.5
论文数:
1.6W
被引数:
3.0W
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