Pyrochlore “dynamic spin-ice” Pr2Sn2O7 and monoclinic Pr2Ti2O7: A comparative temperature-dependent Raman study
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
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发表时间：
2011-08
影响因子：
3.3
通讯作者：
S. Saha;Sudakshina Prusty;Surjeet Singh;R. Suryanarayanan;A. Revcolevschi;A. Sood
中科院分区：
文献类型：
--
作者：
S. Saha;Sudakshina Prusty;Surjeet Singh;R. Suryanarayanan;A. Revcolevschi;A. Sood
Here we report a temperature-dependent Raman study of the pyrochlore “dynamic spin-ice” compound Pr2Sn2O7and 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 Pr2Sn2O7at ∼135 and 460cm−1which couple strongly to phonons. Anomalous temperature dependence of phonon frequencies that are observed in pyrochlore Pr2Sn2O7are 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.
