Raman Studies of Underdamped Soft Modes in PbTi
- 20 July 1970
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 25 (3), 167-170
- https://doi.org/10.1103/physrevlett.25.167
Abstract
Unlike other ferroelectric perovskites, PbTi displays temperature-dependent Raman spectra consisting of underdamped modes, including the "soft" transverse-optical (TO) modes. Moreover, the softest TO mode shows linewidth divergence at the ferroelectric-to-paraelectric transition. Also in contrast to previously studied perovskites, Raman selection rules are rigorously obeyed in both the ferroelectric and paraelectric states.
Keywords
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