The Library
Mapping orthorhombic domains with geometrical phase analysis in rare-earth nickelate heterostructures
Tools
Mundet, Bernat, Hadjimichael, Marios, Fowlie, Jennifer, Korosec, Lukas, Varbaro, Lucia, Domínguez, Claribel, Triscone, Jean-Marc and Alexander, Duncan T. L. (2024) Mapping orthorhombic domains with geometrical phase analysis in rare-earth nickelate heterostructures. APL Materials, 12 (3). doi:10.1063/5.0180998 ISSN 2166-532X.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Official URL: http://doi.org/10.1063/5.0180998
Abstract
Most perovskite oxides belong to the Pbnm space group, composed of an anisotropic unit cell, A-site antipolar displacements, and oxygen octahedral tilts. Mapping the orientation of the orthorhombic unit cell in epitaxial heterostructures that consist of at least one Pbnm compound is often needed for understanding and controlling the different degrees of coupling established at their coherent interfaces and, therefore, their resulting physical properties. However, retrieving this information from the strain maps generated with high-resolution scanning transmission electron microscopy can be challenging, because the three pseudocubic lattice parameters are very similar in these systems. Here, we present a novel methodology for mapping the crystallographic orientation in Pbnm systems. It makes use of the geometrical phase analysis algorithm, as applied to aberration-corrected scanning transition electron microscopy images, but in an unconventional way. The method is fast and robust, giving real-space maps of the lattice orientations in Pbnm systems, from both cross section and plan-view geometries, and across large fields of view. As an example, we apply our methodology to rare-earth nickelate heterostructures, in order to investigate how the crystallographic orientation of these films depends on various structural constraints that are imposed by the underlying single crystal substrates. We observe that the resulting domain distributions and associated defect landscapes mainly depend on a competition between the epitaxial compressive/tensile and shear strains, together with the matching of atomic displacements at the substrate/film interface. The results point toward strategies for controlling these characteristics by appropriate substrate choice.
Item Type: | Journal Article | ||||||
---|---|---|---|---|---|---|---|
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | APL Materials | ||||||
Publisher: | American Institute of Physics | ||||||
ISSN: | 2166-532X | ||||||
Official Date: | 15 March 2024 | ||||||
Dates: |
|
||||||
Volume: | 12 | ||||||
Number: | 3 | ||||||
DOI: | 10.1063/5.0180998 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) |
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |