Landau-Ginzburg-Devonshire theory of the chiral phase transition in 180° domain walls of PbTiO<sub>3</sub>
- Author(s)
- I. Rychetsky, W. Schranz, A. Tröster
- Abstract
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(s)
- Physics of Functional Materials, Computational and Soft Matter Physics
- External organisation(s)
- Czech Academy of Sciences
- Journal
- Physical Review B
- Volume
- 108
- No. of pages
- 6
- ISSN
- 2469-9950
- DOI
- https://doi.org/10.1103/PhysRevB.108.104107
- Publication date
- 09-2023
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103015 Condensed matter, 103043 Computational physics, 103036 Theoretical physics
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Condensed Matter Physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/landauginzburgdevonshire-theory-of-the-chiral-phase-transition-in-180-domain-walls-of-pbtio3(efa9136d-c58c-4821-8e4a-0b246897cff7).html