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Revisiting lattice thermal conductivity of CsCl: The crucial role of quartic anharmonicity.
- Source :
-
Applied Physics Letters . 4/22/2024, Vol. 124 Issue 17, p1-6. 6p. - Publication Year :
- 2024
-
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]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 124
- Issue :
- 17
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 176871480
- Full Text :
- https://doi.org/10.1063/5.0201393