Mixed acoustic phonons and phase modes in an aperiodic composite crystal

Aperiodic crystals which are long range ordered materials present original dynamics features due to the lack of translational symmetry formally implying the nonvalidity of the Brillouin zone concept. This Letter reports the observation by neutron scattering of an overdamped acousticlike mode at a Br...

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Bibliographic Details
Published in:Physical review letters 2011-11, Vol.107 (20), p.205502-205502, Article 205502
Main Authors: Toudic, B, Lefort, R, Ecolivet, C, Guérin, L, Currat, R, Bourges, P, Breczewski, T
Format: Article
Language:English
Subjects:
Chemical Sciences
Condensed Matter
Materials Science
Other
Physics
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Summary:Aperiodic crystals which are long range ordered materials present original dynamics features due to the lack of translational symmetry formally implying the nonvalidity of the Brillouin zone concept. This Letter reports the observation by neutron scattering of an overdamped acousticlike mode at a Bragg peak position in a n-alkane-urea inclusion crystal. This result implies the existence of a gap in the dispersion branch. The gap and anomalous damping of these collective modes are discussed in terms of specific dynamics and interaction in aperiodic materials.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.107.205502