Journal Article

FZJ-2021-02869

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Atomic resolution HOLZ-STEM imaging of atom position modulation in oxide heterostructures

Nord, M. ; Barthel, J.FZJ* ; Allen, C. S. ; McGrouther, D. ; Kirkland, A. I. ; MacLaren, I. (Corresponding author)

2021
Elsevier Science Amsterdam

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Please use a persistent id in citations: http://hdl.handle.net/2128/28083  doi:10.1016/j.ultramic.2021.113296

Abstract: 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.

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Contributing Institute(s):

1. Materialwissenschaft u. Werkstofftechnik (ER-C-2)

Research Program(s):

1. 5351 - Platform for Correlative, In Situ and Operando Characterization (POF4-535) (POF4-535)
2. 5352 - Understanding the Functionality of Soft Matter and Biomolecular Systems (POF4-535) (POF4-535)

Appears in the scientific report 2021

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