Dresden 2011 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 12: Poster
DF 12.5: Poster
Mittwoch, 16. März 2011, 15:00–17:30, P1
Ultrafast X-ray Diffraction with Synchrotron Pulses — •Yevgen Goldshteyn1, Roman Shayduk1, Hengameh Navirian1, Marc Herzog2, Peter Gaal2, Wolfram Leitenberger2, and Matias Bargheer1,2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahm-Meitner-Platz 1, 14109 Berlin — 2Institute of Physics and Astronomy, University Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam
The technique of time resolved X-ray diffraction with synchrotron pulses allows probing structural dynamics of matter with time resolution of approximately 100 ps. First time-resolved X-ray diffraction experiments at the EDR beamline at BESSY II have been performed on epitaxial La0.8Sr0.2MnO3 (LSMO) and SrTiO3 (STO) superlattices (SL) grown on single crystalline STO substrate. The heat transport in both the SL and the substrate has been studied on timescales of 50 ps to 4 µs. A Ti:Sa laser with 350 fs pulse duration is used to rapidly heat up the sample. Monochromatized X-ray pulses are used to measure SL diffraction peak profiles as a function of pump-probe delay. The peak shift is proportional to the strain in the SL caused by thermal expansion. The transient strain is detected with an accuracy of 10−7 and compared to simulations.
In addition, this poster presents the conceptual upgrade of the EDR beamline, which aims at shortening the X-ray pulses down to 1 ps pulse duration. First tests of controlled shortening have been successfully performed at ESRF and SLS.