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Strain and composition dependence of the orbital polarization in nickelate superlattices

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arxiv 1308.6389 v1 pith:PGWCJSHH submitted 2013-08-29 cond-mat.str-el

M. Wu , E. Benckiser , M. W. Haverkort , A. Frano , Y. Lu , U. Nwankwo , S. Brück , P. Audehm
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E. Goering S. Macke V. Hinkov P. Wochner G. Christiani S. Heinze G. Logvenov H.-U. Habermeier B. Keimer
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keywords layersstraincompositionorbitalanalysisblockingchemicalinfluence
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A combined analysis of x-ray absorption and resonant reflectivity data was used to obtain the orbital polarization profiles of superlattices composed of four-unit-cell-thick layers of metallic LaNiO3 and layers of insulating RXO3 (R=La, Gd, Dy and X=Al, Ga, Sc), grown on substrates that impose either compressive or tensile strain. This superlattice geometry allowed us to partly separate the influence of epitaxial strain from interfacial effects controlled by the chemical composition of the insulating blocking layers. Our quantitative analysis reveal orbital polarizations up to 25%. We further show that strain is the most effective control parameter, whereas the influence of the chemical composition of the blocking layers is comparatively small.

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  1. Topotactic oxidation of Ruddlesden-Popper nickelates reveals new structural family: oxygen-intercalated layered perovskites

    cond-mat.mtrl-sci 2025-06 conditional novelty 8.0 of 10

    Ozone annealing of Ruddlesden-Popper nickelate films intercalates about 0.7 oxygen atoms per formula unit into the rock-salt spacer layers, creating a new layered perovskite family with strong metal-oxygen hybridization.

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