Calibrated real-time detection of nonlinearly propagating strain waves
- Epitaxially grown metallic oxide transducers support the generation of ultrashort strain pulses in SrTiO3 (STO) with high amplitudes up to 0.5%. The strain amplitudes are calibrated by real-time measurements of the lattice deformation using ultrafast x-ray diffraction. We determine the speed at which the strain fronts propagate by broadband picosecond ultrasonics and conclude that, above a strain level of approx. 0.2%, the compressive and tensile strain components travel at considerably different sound velocities, indicating nonlinear wave behavior. Simulations based on an anharmonic linear-chain model are in excellent accord with the experimental findings and show how the spectrum of coherent phonon modes changes with time.
Author details: | Andre BojahrGND, Marc HerzogORCiDGND, Daniel Schick, Ionela Vrejoiu, Matias BargheerORCiDGND |
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DOI: | https://doi.org/10.1103/PhysRevB.86.144306 |
ISSN: | 1098-0121 |
Title of parent work (English): | Physical review : B, Condensed matter and materials physics |
Publisher: | American Physical Society |
Place of publishing: | College Park |
Publication type: | Article |
Language: | English |
Year of first publication: | 2012 |
Publication year: | 2012 |
Release date: | 2017/03/26 |
Volume: | 86 |
Issue: | 14 |
Number of pages: | 5 |
Funding institution: | DFG [BA 2281/3-1, SFB 762] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
Peer review: | Referiert |