University of Oulu

Yao, L., Inkinen, S., Komsa, H., & Dijken, S. (2021). Structural Phase Transitions to 2D and 3D Oxygen Vacancy Patterns in a Perovskite Film Induced by Electrical and Mechanical Nanoprobing. Small, 17(10), 2006273.

Structural phase transitions to 2D and 3D oxygen vacancy patterns in a perovskite film induced by electrical and mechanical nanoprobing

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Author: Yao, Lide1; Inkinen, Sampo1; Komsa, Hannu-Pekka2,3;
Organizations: 1NanoSpin, Department of Applied Physics, Aalto University School of Science, P.O. Box 15100, Aalto, FI‐00076 Finland
2Department of Applied Physics, Aalto University School of Science, P.O. Box 11100, Aalto, FI‐00076 Finland
3Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, FI‐90014 Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.9 MB)
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Language: English
Published: John Wiley & Sons, 2021
Publish Date: 2021-04-20


Oxygen vacancy migration and ordering in perovskite oxides enable manipulation of material properties through changes in the cation oxidation state and the crystal lattice. In thin‐films, oxygen vacancies conventionally order into equally spaced planes. Here, it is shown that the planar 2D symmetry is broken if a mechanical nanoprobe restricts the chemical lattice expansion that the vacancies generate. Using in situ scanning transmission electron microscopy, a transition from a perovskite structure to a 3D vacancy‐ordered phase in an epitaxial La2/3Sr1/3MnO3–δ film during voltage pulsing under local mechanical straining is imaged. The never‐before‐seen ordering pattern consists of a complex network of distorted oxygen tetrahedra, pentahedra, and octahedra that, together, produce a corrugated atomic structure with lattice constants varying between 3.5 and 4.6 Å. The giant lattice distortions respond sensitively to strain variations, offering prospects for non‐volatile nanoscale physical property control driven by voltage and gated by strain.

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Series: Small
ISSN: 1613-6810
ISSN-E: 1613-6829
ISSN-L: 1613-6810
Volume: 17
Issue: 10
Article number: 2006273
DOI: 10.1002/smll.202006273
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
116 Chemical sciences
216 Materials engineering
213 Electronic, automation and communications engineering, electronics
Funding: This work was supported by the Academy of Finland (Grant Nos. 293929, 304291, 319218, 311058, and 316857). In situ STEM analysis was conducted at the Aalto University OtaNano‐Nanomicroscopy Center (Aalto‐NMC).
Copyright information: 2021 The Authors. Small published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.