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In operando adjustable orbital polarization in LaNiO3 thin films

AuthorsVasili, Hari Babu; Pesquera, David ; Valvidares, Manuel; Gargiani, Pierluigi; Pellegrin, Eric; Bondino, Federica; Magnano, Elena; Barla, Alessandro; Fontcuberta, Josep
KeywordsAtomic orbital
Electronically polarized systems
Epitaxial strain
Strain engineering
Thin films
Transition-metal oxides
X-ray absorption spectroscopy
X-ray diffraction
Strain engineering
Issue Date7-Apr-2020
PublisherAmerican Physical Society
CitationPhysical Review Materials 4(4): 044404 (2020)
AbstractThe different occupancy of electronic orbitals, the so-called orbital polarization, is a key parameter determining electric and magnetic properties of materials. Here we report on the demonstration of in operando voltage-controlled tuning of the orbital occupation in LaNiO3 epitaxial thin films grown on piezoelectric substrates. The different static contributions to the orbital occupation are disentangled, namely the epitaxial strain and the surface symmetry breaking, and the superimposed electric-field controlled orbital polarization are determined by x-ray linear dichroism at the Ni L2,3 edges. The voltage-controlled orbital polarization allows changing the orbital polarization by about an additional 50%.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevMaterials.4.044404
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