Raman excitations and orientational ordering in deuterium at high pressure
- 1 December 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 54 (22) , R15590-R15593
- https://doi.org/10.1103/physrevb.54.r15590
Abstract
High-resolution Raman spectra of ortho/para mixed crystals of deuterium to 4 K and pressures to 40 GPa reveal a number of phenomena. We find for para-containing samples a large enhancement of high-frequency vibron sidebands, a total of 11 vibron peaks, and significant changes in the low-frequency rotational excitations upon passage into the low-temperature phase. Analysis of the spectra reveals that the phase is orientational ordered and may form a superstructure derived from the high-temperature hcp lattice. The results also suggest that orientational frustration accompanies the transition in ortho/para mixed crystals.Keywords
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