Saha, Surajit ; Prusty, Sudakshina ; Singh, Surjeet ; Suryanarayanan, R. ; Revcolevschi, A. ; Sood, A. K. (2011) Pyrochlore "dynamic spin-ice" Pr2Sn2O7 and monoclinic Pr2Ti2O7: a comparative temperature-dependent Raman study Journal of Solid State Chemistry, 184 (8). pp. 2204-2208. ISSN 0022-4596
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.jssc.2011.06.022
Abstract
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 ~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. The phonon-phonon anharmonic interaction which is responsible for the temperature-dependent anomalous behavior of phonons, arise due to the inherent vacant sites in the pyrochlore structure.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Pyrochlore; Raman Spectroscopy; Phonon Anharmonicity; Crystal-field Splitting |
| ID Code: | 54818 |
| Deposited On: | 12 Aug 2011 12:53 |
| Last Modified: | 12 Aug 2011 12:53 |
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