Regensburg 2007 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 11: Poster Session

DF 11.28: Poster

Donnerstag, 29. März 2007, 14:30–18:00, Poster C

Pulsed x-ray scattering on laser excited barium titanate — •Anton Plech¹, Konstantin Istomin¹, Vassilios Kotaidis¹, and Qingyu Kong² — ¹Fachbereich Physik, Uni Konstanz, Universitätsstr. 10, D-78457 Konstanz — ²ESRF, BP 220, F-38043 Grenoble

Pulsed x-ray scattering is used to resolve the structural dynamics of laser excited barium titanate powder. The sample is excited by intense near-IR femtosecond laser pulses close to the ferroelectric to paraelectric phase transition. By using the synchronized pulses of the Synchrotron Radiation source ESRF it was possible to resolve the lattice transformation and order parameter change at a 100ps time resolution. It is shown, that the polarization of the unit cell decouples from the thermal lattice change in the picosecond regime.

K. Istomin, V. Kotaidis, A. Plech and Q. Kong, Appl. Phys. Lett. (2007) in press.