Localization of Propagative Phonons in a Perfectly Crystalline Solid
Résumé
Perfectly crystalline solids are excellent heat conductors. Prominent counterexamples are intermetallic clathrates, guest-host systems with a high potential for thermoelectric applications due to their ultralow thermal conductivities. Our combined experimental and theoretical investigation of the lattice dynamics of a particularly simple binary representative, Ba 8 Si 46 , identifies the mechanism responsible for the reduction of lattice thermal conductivity intrinsic to the perfect crystal structure. Above a critical wave vector, the purely harmonic guest-host interaction leads to a drastic transfer of spectral weight to the guest atoms, corresponding to a localization of the propagative phonons.
Domaines
Matériaux
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2014-Pailhes-Localizationofpropagativephononsinaperfectlycrystallinesolid.pdf (2.65 Mo)
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