Berlin 2005 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 9: Phasenüberg
änge und Spektroskopie

DF 9.6: Vortrag

Dienstag, 8. März 2005, 12:00–12:20, TU EMH225

Dielectric response due to stochastic motion of pinned domain walls — •Andrei Fedorenko, Volkmar Mueller, and Semjon Stepanow — Martin-Luther-Universität Halle, Fachbereich Physik, D-06099

We study the contribution of stochastic motion of a domain wall to the dielectric AC susceptibility for low frequencies. Using the concept of waiting time distributions, which is related to the energy landscape of the domain wall in a disordered medium, we derive the power-law behavior of the complex susceptibility observed recently in some ferroelectrics below Curie temperature.