TY  - JOUR
A1  - Shayduk, Roman
A1  - Herzog, Marc
A1  - Bojahr, Andre
A1  - Schick, Daniel
A1  - Gaal, Peter
A1  - Leitenberger, Wolfram
A1  - Navirian, Hengameh
A1  - Sander, Mathias
A1  - Goldshteyn, Jevgenij
A1  - Vrejoiu, Ionela
A1  - Bargheer, Matias
T1  - Direct time-domain sampling of subterahertz coherent acoustic phonon spectra in SrTiO3 using ultrafast x-ray diffraction
JF  - Physical review : B, Condensed matter and materials physics
N2  - We synthesize sub-THz longitudinal quasimonochromatic acoustic phonons in a SrTiO3 single crystal using a SrRuO3/SrTiO3 superlattice as an optical-acoustic transducer. The generated acoustic phonon spectrum is determined using ultrafast x-ray diffraction. The analysis of the generated phonon spectrum in the time domain reveals a k-vector dependent phonon lifetime. It is observed that even at sub-THz frequencies the phonon lifetime agrees with the 1/omega(2) power law known from Akhiezer's model for hyper sound attenuation. The observed shift of the synthesized spectrum to the higher q is discussed in the framework of nonlinear effects appearing due to the high amplitude of the synthesized phonons.
Y1  - 2013
U6  - https://doi.org/10.1103/PhysRevB.87.184301
SN  - 1098-0121
VL  - 87
IS  - 18
PB  - American Physical Society
CY  - College Park
ER  -