Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session X04: Dielectric & Ferroic Oxides -- Structure & Functionality of Ferroic Domain Walls
8:00 AM–10:48 AM,
Friday, March 8, 2019
BCEC Room: 107C
Sponsoring Units: DMP DCOMP
Chair: Javier Junquera, University of Cantabria
Abstract: X04.00002 : Electronic structure of twin wall/surface intersections in CaTiO3 (001)*
8:12 AM–8:24 AM
(Department of Earth Sciences, University of Cambridge)
(Department of Materials Science and Engineering, Xi'an University of Technology)
In CaTiO3 the strain order is defined by the octahedral tilt. At the twin walls the octahedral tilt goes to zero allowing Ti off-centering and the twin wall acquires a ferroelectric polarization [2, 3].
We have studied the intersections between different twin walls and the (001) surface using low energy electron microscopy (LEEM) and molecular dynamics simulations including Landau springs and Coulomb interactions. The domain surfaces develop polarity close to the twin walls. The elastically induced dipoles cause contrast in LEEM, unexpected for nominally non-polar surfaces. The outward and inward twin wall polarity is in good agreement with simulations.
 G. Catalan, J. Seidel, R. Ramesh, and J. F. Scott, Rev. Mod. Phys. 84, 119 (2012)
 L. Goncalves-Ferreira et al., Phys. Rev. Lett. 101, 097602 (2008)
 G.F. Nataf et al., Phys. Rev. Mater. 1, 074410 (2017)
*DFG-ANR HREELM 2014 project.
ERSRC (EP/PO24904/1) and the Levershulme trust (RP6-2012-564).
Investissements d’Avenir (Labex NanoSaclay: ANR-10-LABX-0035)
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