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Journal Articles Physical Review B Year : 2018

Phonons in an aperiodic alkane/urea composite crystal studied by inelastic x-ray scattering

Abstract

Aperiodic composite crystals belong to a new state of matter that possesses long-range order without translational symmetry. We report measurements of low-lying phonon branches in a n-alkane/urea compound that provide a new insight to the urea sub-lattice and the commensurate basal plane dynamics. Focusing on the thoroughly studied n-nonadecane/urea compound makes a comparison with other inelastic scattering results possible, allowing the observation of a new aperiodic elastic signature. Using three techniques, slight but reproducible difference in sound velocities is observed between the transverse mode propagating along the aperiodic direction and polarized in the commensurate basal plane, and the one polarized along the aperiodic direction propagating in the basal plane.
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Dates and versions

hal-01994030 , version 1 (22-03-2019)

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C. Ecolivet, M. Verezhak, Céline Mariette, Laurent Guérin, P. Rabiller, et al.. Phonons in an aperiodic alkane/urea composite crystal studied by inelastic x-ray scattering. Physical Review B, 2018, 98 (22), pp.224308+. ⟨10.1103/PhysRevB.98.224308⟩. ⟨hal-01994030⟩
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