1. Revisiting lattice thermal conductivity of CsCl: The crucial role of quartic anharmonicity.
- Author
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Wang, Xiaoying, Feng, Minxuan, Xia, Yi, Sun, Jun, Ding, Xiangdong, Li, Baowen, and Gao, Zhibin
- Subjects
ANHARMONIC motion ,MATCHING theory ,CRYSTAL structure ,PHONON scattering ,THERMAL conductivity ,PHONONS ,CESIUM - Abstract
Thermal conductivity ( κ L ) plays a critical role in thermal management applications. Usually, crystals with simpler structures exhibit higher κ L due to fewer phonon scatterings. However, cesium chloride (CsCl) presents an anomaly, demonstrating an unexpectedly low κ L of 1.0 W m
−1 K−1 at 300 K, as observed in Professor Iversen's experimental measurement despite its simple structure. This prompts a need for understanding anomalous low κ L and matching theory with experimental observations. Our study brings forth several findings for CsCl: (i) relying solely on three-phonon scattering inadequately captures κ L . (ii) Anharmonic phonon renormalization significantly contributes to increased κ L . (iii) Coherent phonons align temperature-dependent κ L closely with the experiment. This work not only enhances understanding of anomalous κ L in CsCl but also provides an approach to bridge the gap between experiment and theory in other crystals. [ABSTRACT FROM AUTHOR]- Published
- 2024
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