Topological defects in hexagonal manganites: Inner structure and emergent electrostatics
MUNDY, Julia A.
Department of Material Science and Engineering
School of Applied and Engineering physics [Ithaca] [AEP Cornell]
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Department of Material Science and Engineering
School of Applied and Engineering physics [Ithaca] [AEP Cornell]
MUNDY, Julia A.
Department of Material Science and Engineering
School of Applied and Engineering physics [Ithaca] [AEP Cornell]
Department of Material Science and Engineering
School of Applied and Engineering physics [Ithaca] [AEP Cornell]
YAN, Zewu
Materials Science Division [LBNL Berkeley]
Department of Physics = Departement Physik [ETH Zürich] [D-PHYS]
Materials Science Division [LBNL Berkeley]
Department of Physics = Departement Physik [ETH Zürich] [D-PHYS]
MULLER, David A.
School of Applied and Engineering physics [Ithaca] [AEP Cornell]
Kavli Institute at Cornell for Nanoscale Science [KIC]
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School of Applied and Engineering physics [Ithaca] [AEP Cornell]
Kavli Institute at Cornell for Nanoscale Science [KIC]
Language
en
Article de revue
This item was published in
Nano Letters. 2017-09-18, vol. 17, n° 10, p. 5883-5890
American Chemical Society
English Abstract
Diverse topological defects arise in hexagonal manganites, such as ferroelectric vortices, as well as neutral and charged domain walls. The topological defects are intriguing because their low symmetry enables unusual ...Read more >
Diverse topological defects arise in hexagonal manganites, such as ferroelectric vortices, as well as neutral and charged domain walls. The topological defects are intriguing because their low symmetry enables unusual couplings between structural, charge, and spin degrees of freedom, holding great potential for novel types of functional 2D and 1D systems. Despite the considerable advances in analyzing the different topological defects in hexagonal manganites, the understanding of their key intrinsic properties is still rather limited and disconnected. In particular, a rapidly increasing number of structural variants is reported without clarifying their relation, leading to a zoo of seemingly unrelated topological textures. Here, we combine picometer-precise scanning-transmission-electron microscopy with Landau theory modeling to clarify the inner structure of topological defects in Er1-xZrxMnO3. By performing a comprehensive parametrization of the inner atomic defect structure, we demonstrate that one primary length scale drives the morphology of both vortices and domain walls. Our findings lead to a unifying general picture of this type of structural topological defects. We further derive novel fundamental and universal properties, such as unusual bound-charge distributions and electrostatics at the ferroelectric vortex cores with emergent U(1) symmetry.Read less <
English Keywords
Ferroics
domain walls
ferroelectric vortices
topological defects
ANR Project
Initiative d'excellence de l'Université de Bordeaux
Origin
Hal imported