Polarisation topology at the nominally charged domain walls in uniaxial ferroelectrics

Yurii Tikhonov, Jesi R. Maguire, Conor J. McCluskey, James P. V. McConville, Amit Kumar, Haidong Lu, Dennis Meier, Anna Razumnaya, John Martin Gregg, Alexei Gruverman, Valerii Vinokur*, Igor Luk'yanchuk

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
61 Downloads (Pure)

Abstract

Ferroelectric domain walls provide a fertile environment for novel materials physics. If a polarisation discontinuity arises, it can drive a redistribution of electronic carriers and changes in band structure, which often result in emergent two-dimensional conductivity. If such a discontinuity is not tolerated, then its amelioration usually involves the formation of complex topological patterns, such as flux-closure domains, dipolar vortices, skyrmions, merons or Hopfions. The degrees of freedom required for the development of such patterns, in which dipolar rotation is a hall mark, are readily found in poly-axial systems. In uniaxial ferroelectrics, where only two opposite polar orientations are possible, it has been assumed that discontinuities are unavoidable when antiparallel components of polarisation meet. This perception has been borne out by the appearance of charged conducting domain walls in systems such as hexagonal manganites and lithium niobate. Here, experimental and theoretical investigations on lead germanate (Pb5Ge3O11) reveal that polar discontinuities can be obviated at head-to-head and tail-to-tail domain walls by mutual domain bifurcation along two different axes, creating a characteristic saddle-point domain wall morphology and associated novel dipolar topology, removing the need for screening charge accumulation and associated conductivity enhancement.
Original languageEnglish
Article number2203028
Number of pages7
JournalAdvanced Materials
Volume34
Issue number45
Early online date07 Oct 2022
DOIs
Publication statusPublished - 10 Nov 2022

Keywords

  • Research Article
  • Research Articles
  • domain walls
  • ferroelectrics
  • topology

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