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Title: Non-phonon low-temperature thermal conductivity in clathrate semiconductors
Authors: Parshin, DA
Laermans, Christiane
Parchine, Mikhail #
Issue Date: 2003
Publisher: Elsevier science bv
Series Title: Physica B vol:329-333 pages:1296-1297
Abstract: In a recent paper Cohn et al. (Phys. Rev. Lett. 82 (1999) 779) report an observation of low-temperature glasslike (similar toT(2)) heat conduction in semiconductors Sr8Ga16Ge3O with type-I clathrate hydrate crystal structure. This behavior was attributed to phonon scattering by a broad distribution of two-level systems (TLS). The experiment was carried out on polycrystalline samples with typical grain size around 10 mum. Our simple estimates however show that in such a case at T < 1 K the mean free path of phonons should be limited by boundary scattering inside single grains and not by resonant scattering on TLS. Therefore we conclude that the observed low-temperature thermal conductivity might be of non-phonon origin and rather due to the long-range interaction between dopant ions of Sr in big 24-vertex polyhedral cages. (C) 2003 Elsevier Science B.V. All rights reserved.
URI: 
ISSN: 0921-4526
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Semiconductor Physics Section
Molecular Imaging and Photonics
# (joint) last author

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