Atomic resolution HOLZ-STEM imaging of atom position modulation in oxide heterostructures

Nord, M., Barthel, J., Allen, C. S., McGrouther, D. , Kirkland, A. I. and MacLaren, I. (2021) Atomic resolution HOLZ-STEM imaging of atom position modulation in oxide heterostructures. Ultramicroscopy, 226, 113296. (doi: 10.1016/j.ultramic.2021.113296)

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It is shown that higher order Laue zone (HOLZ) rings in high energy electron diffraction are specific to individual columns of atoms, and show different strengths, structure and radii for different atom columns along the same projection in a structure. An atomic resolution 4-dimensional STEM dataset is recorded from a <110> direction in a perovskite trilayer, where only the central LaFeO3 layer should show a period doubling that gives rise to an extra HOLZ ring. Careful comparison between experiment and multislice simulations is used to understand the origins of all features in the patterns. A strong HOLZ ring is seen for the La-O columns, indicating strong La position modulation along this direction, whereas a weaker ring is seen along the O columns, and a very weak ring is seen along the Fe columns. This demonstrates that atomic resolution HOLZ-STEM is a feasible method for investigating the 3D periodicity of crystalline materials with atomic resolution.

Item Type:Articles
Glasgow Author(s) Enlighten ID:McGrouther, Dr Damien and Nord, Dr Magnus and MacLaren, Dr Ian
Authors: Nord, M., Barthel, J., Allen, C. S., McGrouther, D., Kirkland, A. I., and MacLaren, I.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Ultramicroscopy
ISSN (Online):1879-2723
Published Online:01 May 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Ultramicroscopy 226: 113296
Publisher Policy:Reproduced under a Creative Commons License
Data DOI:10.5281/zenodo.4061716

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
171131Fast Pixel Detectors: a paradigm shift in STEM imagingIan MacLarenEngineering and Physical Sciences Research Council (EPSRC)EP/M009963/1P&S - Physics & Astronomy