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Title: Towards 3D mapping of BO₆ octahedron rotations at perovskite heterointerfaces, unit cell by unit cell

Journal Article · · ACS Nano
 [1];  [2];  [1];  [1];  [3];  [4];  [3];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); The Univ. of Tokyo, Tokyo (Japan)
  3. Drexel Univ., Philadelphia, PA (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Vanderbilt Univ., Nashville, TN (United States)

The rich functionalities in the ABO₃ perovskite oxides originate at least partly from the ability of the corner-connected BO₆ octahedral network to host a large variety of cations through distortions and rotations. Characterizing these rotations, which significantly affect both fundamental aspects of materials behavior and possible applications, remains a major challenge. In this work, we have developed a unique method of investigating BO₆ rotation patterns in complex oxides ABO₃ with unit cell resolution at heterointerfaces, where novel properties often emerge. Our method involves column shape analysis in annular bright field - scanning transmission electron microscope images of the ABO₃ heterointerfaces taken in specific orientations. The rotating phase of BO₆ octahedra can be identified for all three spatial dimensions without the need of case-by-case simulation. In several common rotation systems, it is now possible to quantitatively measure all three rotation angles. With this method, we examined interfaces between perovskites with distinct tilt systems as well as interfaces between tilted and untilted perovskites, identifying an unusual coupling behavior at the CaTiO₃/LSAT interface. We believe this unique method will significantly improve our knowledge of the complex oxide heterointerfaces.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1213334
Journal Information:
ACS Nano, Journal Name: ACS Nano Journal Issue: 8 Vol. 9; ISSN 1936-0851
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (20)

Identifying local structural states in atomic imaging by computer vision journal November 2016
Atomap: a new software tool for the automated analysis of atomic resolution images using two-dimensional Gaussian fitting journal February 2017
Feature extraction via similarity search: application to atom finding and denoising in electron and scanning probe microscopy imaging journal March 2018
Correlation between Geometrically Induced Oxygen Octahedral Tilts and Multiferroic Behaviors in BiFeO 3 Films journal March 2018
Thickness‐Dependent Ru Exchange Spring at La 0.7 Sr 0.3 MnO 3 –SrRuO 3 Interface journal February 2020
Control of octahedral rotations via octahedral connectivity in an epitaxially strained [1 u.c.//4 u.c.] LaNiO3/LaGaO3 superlattice journal June 2016
Impact of interfacial coupling of oxygen octahedra on ferromagnetic order in La0.7Sr0.3MnO3/SrTiO3 heterostructures journal January 2017
Surface-screening mechanisms in ferroelectric thin films and their effect on polarization dynamics and domain structures journal January 2018
Aberration-corrected scanning transmission electron microscopy for complex transition metal oxides journal June 2016
Atomic-scale measurement of polar entropy journal September 2019
Low-field switching of noncollinear spin texture at L a 0.7 S r 0.3 Mn O 3 − SrRu O 3 interfaces journal January 2019
Structural “ δ Doping” to Control Local Magnetization in Isovalent Oxide Heterostructures journal November 2017
Quantifying Jahn-Teller distortion at the nanoscale with picometer accuracy using position averaged convergent beam electron diffraction journal December 2019
Structure of epitaxial SrIrO 3 perovskite studied by interference between X-ray waves diffracted by the substrate and the thin film journal February 2017
Three-dimensional bright-field scanning transmission electron microscopy elucidate novel nanostructure in microbial biofilms: THREE-DIMENSIONAL BRIGHT-FIELD SCANNING TRANSMISSION journal August 2016
Material structure, properties, and dynamics through scanning transmission electron microscopy journal April 2018
Identifying local structural states in atomic imaging by computer vision journal November 2016
Atomap: a new software tool for the automated analysis of atomic resolution images using two-dimensional Gaussian fitting journal February 2017
Feature extraction via similarity search: application to atom finding and denoising in electron and scanning probe microscopy imaging journal March 2018
Materials Structure, Properties and Dynamics through Scanning Transmission Electron Microscopy text January 2019

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