Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms

Kargar, Fariborz; Penilla, Elias H.; Aytan, Ece; Lewis, Jacob S.; Garay, Javier E.; Balandin, Alexander A.

doi:10.1063/1.5030558

Title: Acoustic phonon spectrum engineering in bulk crystals via incorporation of dopant atoms

Journal Article · Tue May 08 00:00:00 EDT 2018 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5030558· OSTI ID:1503636

Kargar, Fariborz ^[1]; Penilla, Elias H. ^[2];

^[1]; Lewis, Jacob S. ^[1]; Garay, Javier E. ^[2]; Balandin, Alexander A. ^[1]

Univ. of California, Riverside, CA (United States)
Univ. of California, Riverside, CA (United States); Univ. of California, San Diego, CA (United States)

Here 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 ~600 m/s at the Nd density of only ~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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012670

OSTI ID:: 1503636

Alternate ID(s):: OSTI ID: 1436383

Journal Information:: Applied Physics Letters, Vol. 112, Issue 19; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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The discrete noise of magnons Rumyantsev, S.; Balinskiy, M.; Kargar, F. Applied Physics Letters, Vol. 114, Issue 9 https://doi.org/10.1063/1.5088651	journal	March 2019
Phonon-engineered Nb film as a Mott-insulating tunnel-junction network Zen, Nobuyuki AIP Advances, Vol. 9, Issue 9 https://doi.org/10.1063/1.5126616	journal	September 2019
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The Discrete Noise of Magnons Rumyantsev, S.; Balinskiy, M.; Kargar, F. arXiv https://doi.org/10.48550/arxiv.1810.01500	text	January 2018

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