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

DOI: 10.1016/j.ultramic.2021.113296 DOI Help

Authors: Magnus Nord (University of Glasgow; NTNU) , Juri Barthel (Forschungszentrum J├╝lich GmbH) , Christopher S. Allen (Diamond Light Source; University of Oxford) , Damien Mcgrouther (University of Glasgow) , Angus I. Kirkland (Diamond Light Source; University of Oxford) , Ian Maclaren (University of Glasgow)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Ultramicroscopy , VOL 168

State: Published (Approved)
Published: May 2021
Diamond Proposal Number(s): 16952

Open Access Open Access

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.

Subject Areas: Technique Development, Materials, Physics

Diamond Offline Facilities: Electron Physical Sciences Imaging Centre (ePSIC)
Instruments: E02-JEM ARM 300CF

Added On: 04/05/2021 09:27

Documents:
1-s2.0-S030439912100084X-main.pdf

Discipline Tags:

Materials Science Technique Development - Material Sciences Physics Surfaces interfaces and thin films Technique Development - Physics

Technical Tags:

Microscopy Electron Microscopy (EM) Scanning Transmission Electron Microscopy (STEM)