He-atom-scattering studies of the structure and dynamics of the(001) surface and the 186-K phase transition
- 1 November 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 44 (18), 9833-9852
- https://doi.org/10.1103/physrevb.44.9833
Abstract
A phase transition at the surface of (001) is observed by helium-atom-scattering diffraction and surface-phonon-dispersion-curve measurements at =191 K. This transition temperature is only slightly above the corresponding bulk phase transition at =187.5 K. As in the bulk, the phase transition is found to be weakly first order and is driven by the softening of the Rayleigh mode at the M¯ point. Critical scattering is observed up to 320 K. At temperatures higher than ≊420 K an irreversible change in the diffraction intensity is observed, indicating a transition to a partially disordered surface.
Keywords
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