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  Direct measurement of individual phonon lifetimes in the clathrate compound Ba7.81Ge40.67Au5.33

Lory, P.-F., Pailhès, S., Giordano, V. M., Euchner, H., Nguyen, H. D., Ramlau, R., et al. (2017). Direct measurement of individual phonon lifetimes in the clathrate compound Ba7.81Ge40.67Au5.33. Nature Communications, 8: 491, pp. 1-10. doi:10.1038/s41467-017-00584-7.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-E0BF-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-F810-8
Genre: Journal Article

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 Creators:
Lory, Pierre-François1, Author
Pailhès, Stéphane1, Author
Giordano, Valentina M.1, Author
Euchner, Holger1, Author
Nguyen, Hong Duong2, Author              
Ramlau, R.2, Author              
Borrmann, Horst3, Author              
Schmidt, Marcus4, Author              
Baitinger, Michael5, Author              
Ikeda, Matthias1, Author
Tomeš, Petr1, Author
Mihalkovič, Marek1, Author
Allio, Céline1, Author
Johnson, Mark Robert1, Author
Schober, Helmut1, Author
Sidis, Yvan1, Author
Bourdarot, Frédéric1, Author
Regnault, Louis Pierre1, Author
Ollivier, Jacques1, Author
Paschen, Silke1, Author
Grin, Yuri6, Author              de Boissieu, Marc1, Author more..
Affiliations:
1External Organizations, ou_persistent22              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
3Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863410              
4Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              
5Michael Baitinger, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863416              
6Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              

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 Abstract: Engineering lattice thermal conductivity requires to control the heat carried by atomic vibration waves, the phonons. The key parameter for quantifying it is the phonon lifetime, limiting the travelling distance, whose determination is however at the limits of instrumental capabilities. Here, we show the achievement of a direct quantitative measurement of phonon lifetimes in a single crystal of the clathrate Ba7.81Ge40.67Au5.33, renowned for its puzzling ‘glass-like’ thermal conductivity. Surprisingly, thermal transport is dominated by acoustic phonons with long lifetimes, travelling over distances of 10 to 100 nm as their wave-vector goes from 0.3 to 0.1 Å−1. Considering only low-energy acoustic phonons, and their observed lifetime, leads to a calculated thermal conductivity very close to the experimental one. Our results challenge the current picture of thermal transport in clathrates, underlining the inability of state-of-the-art simulations to reproduce the experimental data, thus representing a crucial experimental input for theoretical developments.

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Language(s): eng - English
 Dates: 2017-09-082017-09-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1038/s41467-017-00584-7
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 8 Sequence Number: 491 Start / End Page: 1 - 10 Identifier: ISSN: 2041-1723
CoNE: /journals/resource/2041-1723