Journal
APPLIED PHYSICS LETTERS
Volume 112, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5030558
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences (BES) [SC0012670]
- DARPA Project [W911NF18-1-0041]
- High Energy Laser - Joint Technology Office (HEL-JTO)
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We report results of Brillouin-Mandelstam spectroscopy of transparent Al2O3 crystals with Nd dopants. The ionic radius and atomic mass of Nd atoms are distinctively different from those of the host Al atoms. Our results show that even a small concentration of Nd atoms incorporated into the Al2O3 samples produces a profound change in the acoustic phonon spectrum. The velocity of the transverse acoustic phonons decreases by similar to 600 m/s at the Nd density of only similar to 0.1%. Interestingly, the decrease in the phonon frequency and velocity with the doping concentration is non-monotonic. The obtained results, demonstrating that modification of the acoustic phonon spectrum can be achieved not only by traditional nanostructuring but also by low-concentration doping, have important implications for thermal management as well as thermoelectric and optoelectronic devices. Published by AIP Publishing.
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