Hydrogen vibration and phonon dispersion inα-systems
- 15 July 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 40 (2), 907-911
- https://doi.org/10.1103/physrevb.40.907
Abstract
The phonon dispersion relations in were determined by inelastic neutron scattering for x=0.19 and x=0.33. Predominantly, an increase of the acoustic-phonon frequencies is observed after hydrogen absorption. The hardening is most pronounced for the transverse-acoustic TA(002) phonon branch which in addition shows a shallow dip near q=(2/3 especially at higher hydrogen concentration. An investigation of the deuterium local mode showed a strong vibrational anisotropy similar to recent results in and . However, in contrast to and no peak splitting was observed for the deuterium local mode polarized in the hexagonal direction especially at low temperatures where the formation of D pairs is fully developed. This indicates that a direct D-D interaction is not essential for the pair formation.
Keywords
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