Microscopic mechanism of low thermal conductivity in lead telluride
- Univ. of Tokyo (Japan). Dept. of Mechanical Engineering
- Univ. of Tokyo (Japan). Dept. of Mechanical Engineering; Japan Science and Technology Agency (JST), Kawaguchi (Japan)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Science Division
- Polish Academy of Sciences (PAS), Warsaw (Poland). Inst. of Physics
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Mechanical Engineering
The microscopic physics behind low-lattice thermal conductivity of single-crystal rock salt lead telluride (PbTe) is investigated here. 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.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Univ. of Tokyo (Japan)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Japan Science and Technology Agency (JST)
- Grant/Contract Number:
- SC0001299; FG02-09ER46577
- OSTI ID:
- 1067083
- Alternate ID(s):
- OSTI ID: 1098701
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 85, Issue 15; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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