Dielectric response due to stochastic motion of pinned domain walls

TL;DR

This paper investigates how the random movement of pinned domain walls affects the dielectric AC susceptibility at low frequencies, revealing a power-law behavior linked to the energy landscape in disordered ferroelectric materials.

Contribution

It introduces a theoretical framework using waiting time distributions to explain the power-law dielectric response due to stochastic domain wall motion in disordered media.

Findings

Power-law behavior of complex susceptibility at low frequencies

Relation between energy landscape and dielectric response

Theoretical derivation consistent with recent experimental observations

Abstract

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