Fig. 4: Atomic-resolution determination of hole doping and the influence of residual oxygen on the electronic structure of the infinite layer nickelate superlattice using STEM-EELS. | Nature Communications

Fig. 4: Atomic-resolution determination of hole doping and the influence of residual oxygen on the electronic structure of the infinite layer nickelate superlattice using STEM-EELS.

From: Direct imaging of residual oxygen disorder in an infinite-layer nickelate superlattice via multislice ptychography

Fig. 4: Atomic-resolution determination of hole doping and the influence of residual oxygen on the electronic structure of the infinite layer nickelate superlattice using STEM-EELS.

a Overview and b magnified HAADF images showing the region used for EELS mapping. The orange dashed box in a shows the region cropped for b. Elemental EELS maps of Sr (purple), Ni (green), Nd (red), and Ti (cyan) are overlaid to reveal distinct elemental distributions at the atomic scale. c O K-edge spectra for LaNiO2.542, NdNiO323, and the regions labelled A, B, and C within the infinite inner layers of NdNiO2 shown in a, highlighting changes in electronic structure associated with varying oxygen content. The blue reference spectra of O K edge are from the hole-doped infinite layer Nd0.775Sr0.225NiO2 film (PNAS, licensed under CC BY-NC-ND 4.0)21.

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