Optically detected librons and phonons in crystalline
- 15 October 1993
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 48 (15) , 11446-11449
- https://doi.org/10.1103/physrevb.48.11446
Abstract
Well-defined intermolecular modes of crystalline were studied by means of Fourier-transform Raman and far-infrared spectroscopy. The librational modes are seen to gradually soften and broaden in energy as the temperature is raised from 10 to ∼260 K at which point the libron intensity abruptly vanishes, consistent with the order-disorder phase transition. The librational modes, which are in general agreement with the less well-resolved neutron-scattering results, are found to be remarkably sharp at low temperature.
Keywords
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