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 |
|---|---|
| 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 |
