Journal
PHYSICAL REVIEW B
Volume 94, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.220303
Keywords
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Funding
- Virginia Polytechnic Institute and State University
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
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Cubic boron arsenide (BAs) was predicted to have an exceptionally high thermal conductivity (k) similar to 2000Wm(-1)K(-1) at room temperature, comparable to that of diamond, based on first-principles calculations. Subsequent experimental measurements, however, only obtained a k of similar to 200Wm(-1)K(-1). To gain insight into this discrepancy, we measured phonon dispersion of single-crystal BAs along high symmetry directions using inelastic x-ray scattering and compared these with first-principles calculations. Based on the measured phonon dispersion, we have validated the theoretical prediction of a large frequency gap between acoustic and optical modes and bunching of acoustic branches, which were considered the main reasons for the predicted ultrahigh k. This supports its potential to be a super thermal conductor if very-high-quality single-crystal samples can be synthesized.
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