Ultrafast structural dynamics of perovskite superlattices |
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| Authors: | M Woerner C v Korff Schmising M Bargheer N Zhavoronkov I Vrejoiu D Hesse M Alexe and T Elsaesser |
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| Institution: | (1) Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Str. 2 A, 12489 Berlin, Germany;(2) Institut für Physik und Astronomie, Universit?t Potsdam, 14476 Potsdam, Germany;(3) Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle, Germany |
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| Abstract: | Femtosecond x-ray diffraction provides direct insight into the ultrafast reversible lattice dynamics of materials with a perovskite
structure. Superlattice (SL) structures consisting of a sequence of nanometer-thick layer pairs allow for optically inducing
a tailored stress profile that drives the lattice motions and for limiting the influence of strain propagation on the observed
dynamics. We demonstrate this concept in a series of diffraction experiments with femtosecond time resolution, giving detailed
information on the ultrafast lattice dynamics of ferroelectric and ferromagnetic superlattices. Anharmonically coupled lattice
motions in a SrRuO3/PbZr0.2Ti0.8O3 (SRO/PZT) SL lead to a switch-off of the electric polarizations on a time scale of the order of 1 ps. Ultrafast magnetostriction
of photoexcited SRO layers is demonstrated in a SRO/SrTiO3 (STO) SL. |
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| Keywords: | PACS" target="_blank">PACS 75 80 +q 61 05 C- 78 47 -p |
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