Microscopic mechanism of low thermal conductivity in lead telluride
Name
Shiga-2012-Microscopic mechanism of low thermal.pdf
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611.85 KB
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Author(s)
Shiga, Takuma
Shiomi, Junichiro
Ma, Jie
Delaire, Olivier
Radzynski, Tomasz
Lusakowski, Andrzej
Esfarjani, Keivan
Chen, Gang
Date Issued
April 2012
Journal
Physical Review B
Publisher
American Physical Society
Citation
Shiga, Takuma et al. “Microscopic Mechanism of Low Thermal Conductivity in Lead Telluride.” Physical Review B 85.15 (2012). ©2012 American Physical Society
Version
Final published version
Abstract
The microscopic physics behind low-lattice thermal conductivity of single-crystal rock salt lead telluride (PbTe) is investigated. Mode-dependent phonon (normal and umklapp) scattering rates and their impact on thermal conductivity were quantified by first-principles-based anharmonic lattice dynamics calculations that accurately reproduce thermal conductivity in a wide temperature range. The low thermal conductivity of PbTe is attributed to the scattering of longitudinal acoustic phonons by transverse optical phonons with large anharmonicity and small group velocity of the soft transverse acoustic phonons. This results in enhancing the relative contribution of optical phonons, which are usually minor heat carriers in bulk materials.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.85.155203
