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We report results of Brillouin - Mandelstam spectroscopy of transparentalumina crystals with Nd dopants. The ionic radius and atomic mass of Nd atomsare distinctively different from those of the host Al atoms. Our results showthat even a small concentration of Nd atoms incorporated into the aluminasamples produces a profound change in the acoustic phonon spectrum. Thevelocity of the transverse acoustic phonons decreases by ~600 m/s at the Nddensity of only ~0.1 %. Interestingly, the decrease in the phonon frequency andvelocity with the doping concentration is non-monotonic. The obtained results,demonstrating that modification of the acoustic phonon spectrum can be achievednot only by nanostructuring but also by doping have important implications forthermal management as well as thermoelectric and optoelectronic devices.

Acoustic Phonon Dispersion Engineering in Bulk Crystals via Incorporation of Dopant Atoms