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

I. Rychetsky; W. Schranz; A. Tröster

doi:10.1103/PhysRevB.108.104107

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

I. Rychetsky (Corresponding author)
, W. Schranz
, A. Tröster

Publications: Contribution to journal › Article › Peer Reviewed

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.

Original language	English
Article number	104107
Number of pages	6
Journal	Physical Review B
Volume	108
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.108.104107
Publication status	Published - 1 Sept 2023

Funding

This work was supported by Operational Program Research, Development, and Education (financed by European Structural and Investment Funds and by the Czech Ministry of Education, Youth, and Sports), Project No. SOLID21-CZ.02.1.01/0.0/0.0/16_019/0000760).

Austrian Fields of Science 2012

103015 Condensed matter
103043 Computational physics
103036 Theoretical physics

Access to Document

10.1103/PhysRevB.108.104107

Cite this

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

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 N{\'e}el component in the 180◦ DW of PbTiO3. The tensile strain of the DW plane promotes the development of the Bloch polarization.",

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AB - 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.

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