Direct time-domain sampling of subterahertz coherent acoustic phonon spectra in SrTiO3 using ultrafast x-ray diffraction

Roman Shayduk, Marc Herzog, Andre Bojahr, Daniel Schick, Peter Gaal, Wolfram Leitenberger, Hengameh Navirian, Mathias Sander, Jevgenij Goldshteyn, Ionela Vrejoiu, and Matias Bargheer
Phys. Rev. B 87, 184301 – Published 7 May 2013

Abstract

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/ω2 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.

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  • Received 18 December 2012

DOI:https://doi.org/10.1103/PhysRevB.87.184301

©2013 American Physical Society

Authors & Affiliations

Roman Shayduk1,*, Marc Herzog2, Andre Bojahr2, Daniel Schick2, Peter Gaal1, Wolfram Leitenberger2, Hengameh Navirian2, Mathias Sander2, Jevgenij Goldshteyn1, Ionela Vrejoiu3, and Matias Bargheer1,2

  • 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Wilhelm-Conrad-Röntgen Campus, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany
  • 2Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
  • 3Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

  • *roman.shayduk@helmholtz-berlin.de

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Vol. 87, Iss. 18 — 1 May 2013

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