Berlin 2012 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 7: 100 years since the Laue experiment: Topical aspects of diffraction and scattering (Joint Session KR, BP, CPP, DF, GP, MA, MI, MM; related to SYXD)

DF 7.4: Vortrag

Dienstag, 27. März 2012, 10:30–10:45, EMH 225

Following Strain-Induced Mosaicity Changes of PbZr_0.2Ti_0.8O₃ Thin Films by Ultrafast Reciprocal Space Mapping — •Daniel Schick, André Bojahr, Marc Herzog, Peter Gaal, and Matias Bargheer — Institut für Physik & Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam/Golm

We studied the propagation of coherent sound waves in a PbZr_0.2Ti_0.8O₃ (PZT) - SrRuO₃ (SRO) bilayer sample after optical excitation of the metallic SRO layer. We observed changes of the out-of-plane lattice constant and structure factor of the ferroelectric PZT layer that can be exclusively attributed to the transient strain wave launched from within the SRO layer. In addition to this we are also able to follow in-plane structural dynamics simultaneously utilizing a new ultrafast reciprocal space mapping technique. Thereby we observed a transient change of the mosaicity of the PZT layer on a ps timescale which is again directly coupled to the coherent sound wave travelling through the layer.