Lattice dynamics of commensurate and incommensurateSe
- 1 October 1980
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 22 (7), 3408-3413
- https://doi.org/10.1103/physrevb.22.3408
Abstract
Se undergoes an incommensurate structural transformation at K followed by a commensurate "lock-in" transformation at K. Below , the soft-phonon mode associated with the transformation is "split" into modes representing fluctuations in amplitude and phase of the complex order parameter. We have studied the dispersion and temperature dependence of these modes at K. We have also seen intensity anomalies which can be explained by interactions between a transverse-acoustic-phonon branch and the low-lying "phason" branch.
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