Volume 55, Number 2, July 2001
|Page(s)||201 - 207|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 December 2003|
Acoustic phonons in the aperiodic layered crystal of
Laboratoire Léon Brillouin, CEA-CNRS - CE Saclay,
91191 Gif sur Yvette, France
2 Groupe Matière Condensée et Matériaux, UMR au CNRS 6626 Université de Rennes I - 35042 Rennes Cedex, France
3 Max-Planck-Institut für Festkörperforschung - 70569 Stuttgart, Germany
Accepted: 26 April 2001
We present neutron scattering investigations of the structural dynamical properties of the aperiodic layered compound, . Acoustic phonons behave identically around the assumed average structure Bragg reflection and around the first satellite. This observation proves that the collective dynamics related to the incommensurate structure are quite different from what is expected in a modulated incommensurate model. Our data indicate two acoustic-like longitudinal branches along the incommensurate direction. Such behavior is compatible with a composite incommensurate structure where these two Bragg peaks correspond to the main reflections of each subsystem.
PACS: 61.44.Fw – Incommensurate crystals / 63.20.Dj – Phonon states and bands, normal modes, and phonon dispersion / 61.12.Ex – Neutron scattering techniques (including small-angle scattering)
© EDP Sciences, 2001
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