Regensburg 2016 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 12: Multiferroics I (DF with MA)
DF 12.9: Vortrag
Donnerstag, 10. März 2016, 12:30–12:50, H25
Chaos and stochastic resonance during ferroelectric switching — •Martin Diestelhorst — Martin-Luther-Universität Halle-Wittenberg, Institut für Physik, Von-Danckelmann-Platz 3, 06120 Halle, Germany
The Landau theory of second-order phase-transitions being taken into account, it gives motivation to look for effects like bifurcations, chaos and stochastic resonance in ferroelectrics. The main features of these effects may be understood based on the quartic double-well potential V(x) = a/2 x2 + b/4 x4, which is of the same form as the thermodynamic potential of a ferroelectric with second-order phase-transition near the Curie temperature. The predicted effects could be in principle found in ferroelectric TGS. It is shown that these effects are related to complicated regimes of domain switching and give rise to peculiarities which may not be understood in terms of the simple double-well potential. These effects must be attributed to the real processes which occur during switching.