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

ABSTRACT: Infinite-layer nickelates have garnered significant attention due to their potential for high-temperature superconductivity. Despite extensive research, the interplay between oxygen stoichiometry and electronic properties in infinite layer nickelates remains inadequately understood. In this study, we employ advanced electron microscopy techniques and theoretical modeling to directly visualize the distribution of residual oxygen within an 8NdNiO₂/2SrTiO₃ superlattice, providing novel insights into its structural and electronic effects. Our multislice ptychography analysis reveals a disordered arrangement of apical oxygen atoms, even in regions with low residual oxygen occupancy, invisible in conventional projected images but discernible in depth-resolved phase contrast

SUBMITTER: Yang C 

PROVIDER: S-EPMC12698712 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature