Dresden 2009 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 11: Photonic Dielectrics II

DF 11.1: Hauptvortrag

Mittwoch, 25. März 2009, 14:30–15:05, WIL A317

Real-time probing of structural dynamics in perovskite materials — •Thomas Elsaesser — Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, D-12489 Berlin, Germany

Femtosecond x-ray diffraction probes structural dynamics of solids in real-time and gives insight into reversible geometry changes on atomic length and time scales. After a brief introduction into this field, recent results on the lattice dynamics of ferroelectric SrRuO₃/PbZr_0.2Ti_0.8O₃ superlattice structures and their interplay with the electric polarization of the material are presented [1]. Ultrafast optical generation of mechanical stress allows for switching-off the polarization on a time scale of a few picoseconds. As a second example, magnetostriction in a ferromagnetic SrRuO₃/SrTiO₃ superlattice structure is analyzed in real time [2].

[1] C. von Korff Schmising et al., Phys. Rev. Lett. 98, 257601 (2007)

[2] C. von Korff Schmising et al., Phys. Rev. B 78, 060404(R) (2008)