Phonon dispersions related to the incommensurability near the structural instabilities in the intercalation compound alkane-urea
In this proposal we aim at mapping the excitations of the prototype incommensurate uniaxial intercalation compound c19D40-urea in order, on the one hand, to measure the dynamics related to the incommensurability along the incommensurate axis and, on the other hand, the dynamics related to the structural phase transition. At the same time, a complete mapping of the excitations will allow to observe for the first time the excitations specific of the incommensurability and to understand the role of the phonons modes responsibles of the ferroelastic transition in this material in the plane perpendicular to the incommensurability axis. A complete mapping of the reciprocal space in this system appears to be a way of assigning unambiguously the dynamical features of different origin (host and/or guest) and to estimate the coupling between them. Measurements will be made on an available large single crystal.
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TOUDIC Bertrand; Bourges; DE BOISSIEU Marc; ECOLIVET Claude; GUERIN Laurent; LEMEE Marie Helene; MARIETTE Celine; OLLIVIER Jacques and RABILLER Philippe. (2014). Phonon dispersions related to the incommensurability near the structural instabilities in the intercalation compound alkane-urea. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-02-152
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