Thermal Conductivity of BAs under Pressure

The thermal conductivity of boron arsenide (BAs) is believed to be influenced by phonon scattering selection rules due to its special phonon dispersion. Compression of BAs leads to significant changes in phonon dispersion, which allows for a test of first principles theories for how phonon dispersio...

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Bibliographic Details
Published in:arXiv.org 2023-02
Main Authors: Hou, Songrui, Sun, Bo, Tian, Fei, Cai, Qingan, Wang, Shanming, Peng, Wanyue, Chen, Xi, Ren, Zhifeng, Chen, Li, Wilson, Richard
Format: Article
Language:English
Subjects:
Acoustic properties
Arsenides
Bunching
Conductivity
Density functional theory
Diamond anvil cells
Heat conductivity
Heat transfer
Phonons
Pressure dependence
Pressure effects
Scattering
Thermal conductivity
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Summary:The thermal conductivity of boron arsenide (BAs) is believed to be influenced by phonon scattering selection rules due to its special phonon dispersion. Compression of BAs leads to significant changes in phonon dispersion, which allows for a test of first principles theories for how phonon dispersion affects three- and four-phonon scattering rates. This study reports the thermal conductivity of BAs from 0 to 30 GPa. Thermal conductivity vs. pressure of BAs is measured by time-domain thermoreflectance with a diamond anvil cell. In stark contrast to what is typical for nonmetallic crystals, BAs is observed to have a pressure independent thermal conductivity below 30 GPa. The thermal conductivity of nonmetallic crystals typically increases upon compression. The unusual pressure independence of thermal conductivity of BAs shows the important relationship between phonon dispersion properties and three- and four-phonon scattering rates.
ISSN:2331-8422
DOI:10.48550/arxiv.2110.00215