Evidence of a minoritary monoclinic LaNiO<sub>2.5</sub> phase in lanthanum nickelate thin films

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Title:	Evidence of a minoritary monoclinic LaNiO_2.5 phase in lanthanum nickelate thin films
Author:	López Conesa, Lluís; Rebled, J. M. (José Manuel); Pesquera, David; Dix, Nico; Sánchez, Florencio; Herranz, Gervasi; Fontcuberta, Josep; Magén, César; Casanove, Marie Jose; Estradé Albiol, Sònia; Peiró Martínez, Francisca
Other authors:	Universitat de Barcelona
Abstract:	LaNiO3 (LNO) thin films of 14 nm and 35 nm thicknesses grown epitaxially on LaAlO3 (LAO) and (LaAlO3)0.3(Sr2TaAlO6)0.7 (LSAT) substrates are studied using High Resolution Transmission Electron Microscopy (HRTEM) and High Angle Annular Dark Field (HAADF) imaging. The strain state of the films is studied using Geometric Phase Analysis (GPA). Results show the successful in-plane adaptation of the films to the substrates, both in the compressive (LAO) and tensile (LSAT) cases. Through the systematic analysis of HRTEM superstructure contrast modulation along different crystal orientations, localized regions of the monoclinic LaNiO2.5 phase are detected in the 35 nm films.
Subject(s):	-Ciència dels materials -Cristal·lografia -Pel·lícules fines -Òxids metàl·lics -Estructura electrònica -Materials science -Crystallography -Thin films -Metallic oxides -Electronic structure
Rights:	(c) López Conesa, Lluís et al., 2017
Document type:	Article Article - Accepted version
Published by:	Royal Society of Chemistry
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