期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.095501
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- Tokodai Institute for Element Strategy (TIES)
- Grants-in-Aid for Scientific Research [22104006] Funding Source: KAKEN
We investigate the role of rattling guest atoms on the lattice thermal conductivity of a type-I clathrate Ba8Ga16Ge30 by first-principles lattice dynamics. Comparing phonon properties of filled and empty clathrates, we show that rattlers cause tenfold reductions in the relaxation time of phonons by increasing the phonon-phonon scattering probability. Contrary to the resonant scattering scenario, the reduction in the relaxation time occurs in a wide frequency range, which is crucial for explaining the unusually low thermal conductivities of clathrates. We also find that the impact of rattlers on the group velocity of phonons is secondary because the flattening of phonon dispersion occurs only in a limited phase space in the Brillouin zone.
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