Polarization Topology at the Nominally Charged Domain Walls in Uniaxial Ferroelectrics.

Autor: Tikhonov Y; University of Picardie, Laboratory of Condensed Matter Physics, Amiens, 80039, France.; Faculty of Physics, Southern Federal University, 5 Zorge Street, Rostov-on-Don, 344090, Russia., Maguire JR; Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University Belfast, Belfast, BT7 1NN, UK., McCluskey CJ; Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University Belfast, Belfast, BT7 1NN, UK., McConville JPV; Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University Belfast, Belfast, BT7 1NN, UK., Kumar A; Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University Belfast, Belfast, BT7 1NN, UK., Lu H; Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA., Meier D; Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, 7491, Norway., Razumnaya A; Jožef Stefan Institute, Jamova Cesta 39, Ljubljana, 1000, Slovenia.; Terra Quantum AG, Kornhausstrasse 25, St. Gallen, CH-9000, Switzerland., Gregg JM; Centre for Nanostructured Media, School of Mathematics and Physics, Queen's University Belfast, Belfast, BT7 1NN, UK., Gruverman A; Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA., Vinokur VM; University of Picardie, Laboratory of Condensed Matter Physics, Amiens, 80039, France.; Terra Quantum AG, Kornhausstrasse 25, St. Gallen, CH-9000, Switzerland.; Physics Department, City College of the City University of New York, 160 Convent Avenue, New York, NY, 10031, USA., Luk'yanchuk I; University of Picardie, Laboratory of Condensed Matter Physics, Amiens, 80039, France.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2022 Nov; Vol. 34 (45), pp. e2203028. Date of Electronic Publication: 2022 Oct 07.
DOI: 10.1002/adma.202203028
Abstrakt: Ferroelectric domain walls provide a fertile environment for novel materials physics. If a polarization discontinuity arises, it can drive a redistribution of electronic carriers and changes in band structure, which often result in emergent 2D 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 hallmark, are readily found in multiaxial ferroelectrics. In uniaxial ferroelectrics, where only two opposite polar orientations are possible, it has been assumed that discontinuities are unavoidable when antiparallel components of polarization 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 (Pb 5 Ge 3 O 11 ) 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.
(© 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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