Issue |
Europhys. Lett.
Volume 66, Number 2, April 2004
|
|
---|---|---|
Page(s) | 246 - 252 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2003-10182-3 | |
Published online | 01 April 2004 |
Low-frequency structural dynamics in the incommensurate composite crystal
1
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
Received:
15
October
2003
Accepted:
6
February
2004
Inelastic coherent neutron scattering experiments have been performed to study the low-frequency structural excitations in single crystals of the incommensurate superconducting (-2201) system. As in the -2212 family, the observation of two well-defined propagating “acoustic-like” branches around the main Bragg reflections reflects its composite nature. The two modes naturally correspond to the separate motions of the two sublattices. Constant-Q scans reveal a rapid evolution of the dynamical structure factor with the wave vector.
PACS: 61.44.Fw – Incommensurate crystals / 63.20.Dj – Phonon states and bands, normal modes, and phonon dispersion / 61.12.-q – Neutron diffraction and scattering
© EDP Sciences, 2004
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