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Structural study of nickelate based heterostructures

Published inAPL materials, vol. 12, no. 3, p. 031104
Publication date2024-03-01
First online date2024-03-05
Abstract

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.

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VARBARO, Lucia et al. Structural study of nickelate based heterostructures. In: APL materials, 2024, vol. 12, n° 3, p. 031104. doi: 10.1063/5.0184306
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ISSN of the journal2166-532X
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