Dresden 2011 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 1: Dielectric and ferroelectric thin films 1
DF 1.2: Talk
Monday, March 14, 2011, 11:00–11:20, MÜL Elch
(contribution withdrawn) Observation of ultrafast structural dynamics in perovskite ferroelectrics under optical excitation — •Michael Vattilana1, Dan Daranciang2, Nathaniel Brandt4, Matthew Highland3, Harold Hwang4, Haidan Wen2, Paul Fuoss3, John Goodfellow2, Jorgen Larsson5, Keith Nelson4, Andrew Rappe6, David Reis2, Brian Stephenson3, Klaus Sokolowski-Tinten1, and Aaron Lindenberg2 — 1Universität Duisburg-Essen — 2SLAC/Stanford University — 3Advanced Photon Source, Argonne National Lab — 4Massachusetts Institute of Technology — 5Lunds Universitet — 6University of Pennsylvania
We used femtosecond time-resolved x-ray diffraction to investigate the dynamic structural evolution of thin PbTiO3 films after optical excitation with intense fs laser pulses at 400 nm. The experiments were performed at the XPP pump-probe station of the Linac Coherent Light Source (SLAC) using ultrashort (60 fs) hard X-ray pulses at 9 keV. Our data reveal a complex structural response depending on the temperature (i.e. below and above the ferroelectric Curie-temperature) and the domain structure of the sample. We attribute this behavior to the strong coupling between the ferroelectric polarization, lattice strain and electronic degrees of freedom.