Doping evolution of the Mott–Hubbard landscape in infinite-layer nickelates
Open Access
- 4 January 2021
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 118 (2)
- https://doi.org/10.1073/pnas.2007683118
Abstract
The recent observation of superconductivity in has raised fundamental questions about the hierarchy of the underlying electronic structure. Calculations suggest that this system falls in the Mott–Hubbard regime, rather than the charge-transfer configuration of other nickel oxides and the superconducting cuprates. Here, we use state-of-the-art, locally resolved electron energy-loss spectroscopy to directly probe the Mott–Hubbard character of . Upon doping, we observe emergent hybridization reminiscent of the Zhang–Rice singlet via the oxygen-projected states, modification of the Nd 5d states, and the systematic evolution of Ni 3d hybridization and filling. These experimental data provide direct evidence for the multiband electronic structure of the superconducting infinite-layer nickelates, particularly via the effects of hole doping on not only the oxygen but also nickel and rare-earth bands.
Keywords
Funding Information
- U.S. Department of Defense (FA 9550-16-1-0305)
- U.S. Department of Energy (DE-AC02-76SF00515)
- Gordon and Betty Moore Foundation (GBMF4415)
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