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A combined analysis of x-ray absorption and resonant reflectivity data wasused to obtain the orbital polarization profiles of superlattices composed offour-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 eithercompressive or tensile strain. This superlattice geometry allowed us to partlyseparate the influence of epitaxial strain from interfacial effects controlledby the chemical composition of the insulating blocking layers. Our quantitativeanalysis reveal orbital polarizations up to 25%. We further show that strain isthe most effective control parameter, whereas the influence of the chemicalcomposition of the blocking layers is comparatively small.

Strain and composition dependence of the orbital polarization in nickelate superlattices