Abstract
We report the deposition and characterization of a set of high-quality superlattices using oxide molecular beam epitaxy. We demonstrate that one unit cell of can be stabilized as a perovskite in these structures and that there is no charge transfer across the heterointerface. Detailed spectroscopy data analysis indicates that holes are confined to the unit cells, resulting in a Ni valence between 3 and 4. Hole hopping conductivity is observed in the superlattice but is strongly suppressed along the -axis direction for and 5, resulting in the insulating behavior in the latter. Our study will inspire the epitaxial synthesis of superlattices, as measurements of their properties could open a platform for studying nickelate-based superconductors.
- Received 13 April 2022
- Accepted 27 June 2022
DOI:https://doi.org/10.1103/PhysRevMaterials.6.075006
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