Quantifying the Potential Quasielastic Signal in a Clathrate Material
Complex crystalline materials, such as clathrates, are studied for their low lattice thermal conductivities (K ~ 1-2 W m-1 K-1) and for their ability to be engineered as thermoelectric materials.[1-3] The first experimental measurement of phonon lifetime in clathrates has been made by our group, showing that the lifetime was unexpectedly long. However, the mechanism of phonon scattering is still much debated and could be related either to anharmonic effects or to disorder. Here we propose to study the quasielastic signal that might be associated to the Ba atom rearrangement in the large cage of the clathrate, where a significant disorder has been observed from structural analysis. The experiment will be carried out on IN5 on a single crystal Ba7.81Ge40.67Au5.33. This proposal is part of the PhD thesis work of S. Turner.
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Shelby R. Turner; BOURDAROT Frederic; DE BOISSIEU Marc; GIORDANO Valentina; OLLIVIER Jacques; PAILHES Stephane and SCHOBER Helmut. (2019). Quantifying the Potential Quasielastic Signal in a Clathrate Material. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-504
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