Alternating layers; Atomic-force-microscopy; Density-functional theory calculations; Long axis; Nickelates; Scanning transmission electron microscopy; Spacer layer; Structural studies; Ultra-thin; Unit cells; Materials Science (all); Engineering (all)
Abstract :
[en] Heterostructures consisting of SmNiO3 and NdNiO3 alternating layers with additional LaAlO3 spacer layers were grown and fully characterized by means of x-ray diffraction, atomic force microscopy, and scanning transmission electron microscopy. A change in the orientation of the orthorhombic long-axis of the nickelate layers is observed when a single unit cell of LaAlO3 is inserted between SmNiO3 and NdNiO3, in agreement with density functional theory calculations. At the same time, the structure of the ultra-thin rhombohedral LaAlO3 layers is affected by their proximity to orthorhombic nickelate layers, with both scanning transmission electron microscopy studies and density functional theory calculations revealing a weak antipolar motion of the La-cation in the LaAlO3 layers that is not present in the bulk rhombohedral structure of this compound.
Disciplines :
Physics
Author, co-author :
Varbaro, Lucia ; DQMP, University of Geneva, Geneva, Switzerland
Mundet, Bernat ; DQMP, University of Geneva, Geneva, Switzerland ; Electron Spectrometry and Microscopy Laboratory (LSME), Institute of Physics (IPHYS), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
Bandyopadhyay, Subhadeep ; CESAM Research Unit, Université de Liège, Liège, Belgium
Domínguez, Claribel; DQMP, University of Geneva, Geneva, Switzerland
Fowlie, Jennifer ; Department of Applied Physics, Stanford University, Stanford, United States
Korosec, Lukas ; DQMP, University of Geneva, Geneva, Switzerland
Hsu, Chih-Ying ; DQMP, University of Geneva, Geneva, Switzerland ; Electron Spectrometry and Microscopy Laboratory (LSME), Institute of Physics (IPHYS), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
Alexander, Duncan T. L. ; Electron Spectrometry and Microscopy Laboratory (LSME), Institute of Physics (IPHYS), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
Ghosez, Philippe ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Triscone, Jean-Marc ; DQMP, University of Geneva, Geneva, Switzerland
Language :
English
Title :
Structural study of nickelate based heterostructures
Publication date :
March 2024
Journal title :
APL Materials
ISSN :
2166-532X
Publisher :
American Institute of Physics Inc.
Volume :
12
Issue :
3
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif Tier-1 supercomputer
SNF - Schweizerischer Nationalfonds zur Förderung der wissenschaftlichen Forschung
Funding text :
This work was supported by the Swiss National Science Foundation—Division II (Grant Nos. 200020_179155 and 200020_207338). The authors acknowledge the access to the electron microscopy facilities at the Interdisciplinary Center for Electron Microscopy, École Polytechnique Fédérale de Lausanne.
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