Order-parameter symmetries of domain walls in ferroelectrics and ferroelastics

Pierre Tolédano, Mael Guennou, and Jens Kreisel
Phys. Rev. B 89, 134104 – Published 16 April 2014

Abstract

The symmetry of boundaries between ferroelectric, ferroelastic, and antiphase domains is a key element for a theoretical understanding of their properties. Here, we derive this symmetry from their organic relation to the symmetry of the primary transition order parameters. The domain wall symmetries are shown to coincide with directions of the order-parameter n-dimensional vector space, corresponding to sum of the vectors associated with adjacent domain states. This property is illustrated by the determination of the maximal symmetries of domain walls in BaTiO3, LaAlO3, SrTiO3, and Gd2(MoO4)3. Besides, the domain pattern in YMnO3 is interpreted as resulting from an annihilation-creation process, the annihilation of the antiphase domain walls creating six ferroelectric domain walls merging at a single point.

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  • Received 22 January 2014
  • Revised 31 March 2014

DOI:https://doi.org/10.1103/PhysRevB.89.134104

©2014 American Physical Society

Authors & Affiliations

Pierre Tolédano1, Mael Guennou2,*, and Jens Kreisel2,3

  • 1Laboratoire des Systèmes Complexes, Université de Picardie, 80000 Amiens, France
  • 2Département Science et Analyse des Matériaux, CRP Gabriel Lippmann, 41 rue du Brill, L-4422 Luxembourg
  • 3Physics and Materials Science Research Unit, University of Luxembourg, 41 Rue du Brill, L-4422 Belvaux, Luxembourg

  • *guennou@lippmann.lu

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Vol. 89, Iss. 13 — 1 April 2014

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