Revisiting Lattice Thermal Conductivity of Cscl: the Crucial Role of Quartic Anharmonicity

Authors

Xiaoying Wang, Xi'an Jiaotong University
Minxuan Feng, Xi'an Jiaotong University
Yi Xia, Portland State UniversityFollow
Jun Sun, Xi'an Jiaotong University
Xiangdong Ding, Xi'an Jiaotong University
Baowen Li, Southern University of Science and Technology, Shenzhen
Zhibin Gao, Xi'an Jiaotong University

Published In

Applied Physics Letters

Document Type

Citation

Publication Date

4-22-2024

Abstract

Thermal conductivity plays a critical role in thermal management applications. Usually, crystals with simpler structures exhibit higher due to fewer phonon scatterings. However, cesium chloride (CsCl) presents an anomaly, demonstrating an unexpectedly low 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 and matching theory with experimental observations. Our study brings forth several findings for CsCl: (i) relying solely on three-phonon scattering inadequately captures ⁠. (ii) Anharmonic phonon renormalization significantly contributes to increased ⁠. (iii) Coherent phonons align temperature-dependent closely with the experiment. This work not only enhances understanding of anomalous in CsCl but also provides an approach to bridge the gap between experiment and theory in other crystals.

Rights

© Copyright 2024 AIP Publishing LLC

Locate the Document

https://doi.org/10.1063/5.0201393

DOI

10.1063/5.0201393

Persistent Identifier

https://archives.pdx.edu/ds/psu/41799

Citation Details

Wang, X., Feng, M., Xia, Y., Sun, J., Ding, X., Li, B., & Gao, Z. (2024). Revisiting lattice thermal conductivity of CsCl: The crucial role of quartic anharmonicity. Applied Physics Letters, 124(17).