Observation of an Underdamped "Soft" Mode in Potassium Dihydrogen Phosphate
- 6 August 1973
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 31 (6) , 379-382
- https://doi.org/10.1103/physrevlett.31.379
Abstract
The pressure dependence of the coupled-mode spectra in potassium dihydrogen phosphase (KDP) was measured at room temperature for hydrostatic pressures from 0 to 9.3 kbar. The soft mode, which is overdamped for all temperatures at atmospheric pressure, becomes underdamped for pressures ≥ 6 kbar. This is the first observation of an underdamped soft mode for a crystal of the KDP class and resolves the question of whether the excitation should be considered as diffusive or oscillatory in nature.Keywords
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