Direct Observation of a Phason Gap in an Incommensurate Molecular Compound

Autor:	P. Bourges, J. Etrillard, A. P. Levanyuk, Claude Ecolivet, Bertrand Toudic, J. Ollivier
Rok vydání:	1998
Předmět:	Physics Condensed matter physics Quasielastic neutron scattering Direct observation Saturation (graph theory) General Physics and Astronomy Molecule Soft modes Phason Inelastic neutron scattering Spectral line
Zdroj:	Physical Review Letters. 81:3667-3670
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.81.3667
Popis:	We report the results of an inelastic neutron scattering study of the lattice vibration spectra in the normal and incommensurate phases of $({\mathrm{ClC}}_{6}{\mathrm{D}}_{4}{)}_{2}{\mathrm{SO}}_{2}$. Because of unusually low soft mode damping, a finite value of the phason frequency at the satellite position is observed for the first time. The soft mode frequency saturation in the normal phase and this phason gap are consistent with the dynamical nature of the observed central peak.
Databáze:	OpenAIRE
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