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Applied Physics A

, Volume 106, Issue 3, pp 489–499 | Cite as

Analysis of ultrafast X-ray diffraction data in a linear-chain model of the lattice dynamics

  • M. Herzog
  • D. Schick
  • P. Gaal
  • R. Shayduk
  • C. v. Korff Schmising
  • M. Bargheer
Rapid communication

Abstract

We present ultrafast X-ray diffraction (UXRD) experiments which sensitively probe impulsively excited acoustic phonons propagating in a SrRuO3/SrTiO3 superlattice and further into the substrate. These findings are discussed together with previous UXRD results (Herzog et al. in Appl. Phys. Lett. 96, 161906, 2010; Woerner et al. in Appl. Phys. A 96, 83, 2009; v. Korff Schmising in Phys. Rev. B 78, 060404(R), 2008 and in Appl. Phys. B 88, 1, 2007) using a normal-mode analysis of a linear-chain model of masses and springs, thus identifying them as linear-response phenomena. We point out the direct correspondence of calculated observables with X-ray signals. In this framework the complex lattice motion turns out to result from an interference of vibrational eigenmodes of the coupled system of nanolayers and substrate. UXRD in principle selectively measures the lattice motion occurring with a specific wavevector, however, each Bragg reflection only measures the amplitude of a delocalized phonon mode in a spatially localized region, determined by the nanocomposition of the sample or the extinction depth of X-rays. This leads to a decay of experimental signals although the excited modes survive.

Keywords

Acoustic Phonon Strain Wave Substrate Peak Coherent Phonon Heat Expansion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We thank Chris Milne, Renske van der Veen and Steve Johnson for their help with the experiments at the FEMTO-slicing beamline (XOSLA) of the Swiss Light Source at the PSI, Villigen, Switzerland and Ionela Vrejoiu from Max-Planck Institute for Microstructure Physics in Halle for fruitful discussions and for providing the sample experimentally investigated. M.B. would like to thank Dr. Michael Woerner (MBI Berlin) for very fruitful discussions on the model and simulations using “spacer sticks”. We gratefully acknowledge the financial support by the BMBF via grant No. 03WKP03A and the Deutsche Forschungsgemeinschaft via grant No. BA2281/3-1.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • M. Herzog
    • 1
  • D. Schick
    • 1
  • P. Gaal
    • 1
  • R. Shayduk
    • 2
  • C. v. Korff Schmising
    • 3
  • M. Bargheer
    • 1
    • 2
  1. 1.Institute of Physics and AstronomyUniversity PotsdamPotsdamGermany
  2. 2.Helmholtz-Zentrum Berlin für Materialien und Energie GmbHBerlinGermany
  3. 3.Atomic Physics Division, Department of PhysicsLund UniversityLundSweden

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