Acoustic-Phonon Instability and Critical Scattering inSb
- 27 December 1971
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 27 (26), 1803-1806
- https://doi.org/10.1103/physrevlett.27.1803
Abstract
Neutron-scattering experiments on Sn show the drastic softening of the [110] acoustic shear modes as well as an unusual frequency response (a central peak in addition to the phonon side bands) near the phase transition at 45°K. A model involving coupling of the bare phonon to other fluctuations with a Debye-like frequency spectrum is proposed which correctly describes the observed cross section as a function of temperature.
Keywords
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