Landau-Ginzburg-Devonshire theory of the chiral phase transition in 180° domain walls of PbTiO₃

Autor(en)

I. Rychetsky, W. Schranz, A. Tröster

Abstrakt

A new mechanism leading to a switchable Bloch-type polarization in a domain wall separating two ferroelectric domain states is proposed. A biquadratic coupling of the primary order parameter and its gradient originating
from inhomogeneous electrostriction triggers the chiral phase transition (Ising-to-Bloch) in the domain walls (DW) with softening of the local polar mode and anomalous increase of the dielectric susceptibility at the phase transition temperature TDW < Tc. This mechanism describes the origin and properties of the polar Bloch component, which appears below TDW additionally to the antipolar Néel component in the 180◦ DW of PbTiO₃.
The tensile strain of the DW plane promotes the development of the Bloch polarization.

Organisation(en)

Physik Funktioneller Materialien, Computergestützte Physik und Physik der Weichen Materie

Externe Organisation(en)

Czech Academy of Sciences

Journal

Physical Review B

Band

108

Anzahl der Seiten

6

ISSN

2469-9950

DOI

https://doi.org/10.1103/PhysRevB.108.104107

Publikationsdatum

09-2023

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie, 103043 Computational Physics, 103036 Theoretische Physik

ASJC Scopus Sachgebiete

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/efa9136d-c58c-4821-8e4a-0b246897cff7