@article{72cc5a51d0ea4be184033d843bcca89f,
title = "Doping evolution of the Mott-Hubbard landscape in infinite-layer nickelates",
abstract = "The recent observation of superconductivity in Nd08Sr02NiO2 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 Nd1−xSrxNiO2. 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 = "Electron energy-loss spectroscopy, Hole doping, Infinite-layer nickelates, Mott-Hubbard regime, Superconductivity",
author = "Goodge, {Berit H.} and Danfeng Li and Kyuho Lee and Motoki Osada and Wang, {Bai Yang} and Sawatzky, {George A.} and Hwang, {Harold Y.} and Kourkoutis, {Lena F.}",
note = "Funding Information: ACKNOWLEDGMENTS. B.H.G. and L.F.K. acknowledge support from Department of Defense Air Force Office of Scientific Research Grant FA 9550-16-1-0305. This work made use of the Cornell Center for Materials Research Shared Facilities, which are supported through NSF Materials Research Science and Engineering Centers Program Grant DMR-1719875. The FEI Titan Themis 300 was acquired through NSF Grant NSF-MRI-1429155, with additional support from Cornell University, the Weill Institute, and the Kavli Institute at Cornell. The Thermo Fisher Helios G4 X FIB was acquired with support from the NSF PARADIM under Cooperative Agreement DMR-1539918. The work at SLAC/Stanford is supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Contract DE-AC02-76SF00515, and the Gordon and Betty Moore Foundation{\textquoteright}s Emergent Phenomena in Quantum Systems Initiative through Grant GBMF4415 (synthesis equipment). M.O. acknowledges partial financial support from the Takenaka Scholarship Foundation. G.A.S. acknowledges support from the Natural Sciences and Engineering Research Council and the Stewart Blusson Quantum Matter Institute of the University of British Columbia. Funding Information: B.H.G. and L.F.K. acknowledge support from Department of Defense Air Force Office of Scientific Research Grant FA 9550-16-1-0305. This work made use of the Cornell Center for Materials Research Shared Facilities, which are supported through NSF Materials Research Science and Engineering Centers Program Grant DMR-1719875. The FEI Titan Themis 300 was acquired through NSF Grant NSF-MRI-1429155, with additional support from Cornell University, the Weill Institute, and the Kavli Institute at Cornell. The Thermo Fisher Helios G4 X FIB was acquired with support from the NSF PARADIM under Cooperative Agreement DMR-1539918. The work at SLAC/Stanford is supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Contract DE-AC02-76SF00515, and the Gordon and Betty Moore Foundation's Emergent Phenomena in Quantum Systems Initiative through Grant GBMF4415 (synthesis equipment). M.O. acknowledges partial financial support from the Takenaka Scholarship Foundation. G.A.S. acknowledges support from the Natural Sciences and Engineering Research Council and the Stewart Blusson Quantum Matter Institute of the University of British Columbia. Publisher Copyright: {\textcopyright} This open access article is distributed under Creative Commons Attribution-NonCommercialNoDerivatives License 4.0 (CC BY-NC-ND).",
year = "2021",
month = jan,
day = "12",
doi = "10.1073/pnas.2007683118",
language = "English",
volume = "118",
journal = "Proceedings of the National Academy of Sciences of the United States of America",
issn = "0027-8424",
publisher = "National Academy of Sciences",
number = "2",
}