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Hepting, M; Li, D; Jia, C J; Lu, H; Paris, E; Tseng, Y; Feng, X; Osada, M; Been, E; Hikita, Y; Chuang, Y-D; Hussain, Z; Zhou, K J; Nag, A; Garcia-Fernandez, M; Rossi, M; Huang, H Y; Huang, D J; Shen, Z X; Schmitt, T; Hwang, H Y; Moritz, B; Zaanen, J; Devereaux, T P; Lee, W S
Nature materials, 04/2020, Volume: 19, Issue: 4Journal Article
The search continues for nickel oxide-based materials with electronic properties similar to cuprate high-temperature superconductors . The recent discovery of superconductivity in the doped infinite-layer nickelate NdNiO (refs. ) has strengthened these efforts. Here, we use X-ray spectroscopy and density functional theory to show that the electronic structure of LaNiO and NdNiO , while similar to the cuprates, includes significant distinctions. Unlike cuprates, the rare-earth spacer layer in the infinite-layer nickelate supports a weakly interacting three-dimensional 5d metallic state, which hybridizes with a quasi-two-dimensional, strongly correlated state with Formula: see text symmetry in the NiO layers. Thus, the infinite-layer nickelate can be regarded as a sibling of the rare-earth intermetallics , which are well known for heavy fermion behaviour, where the NiO correlated layers play an analogous role to the 4f states in rare-earth heavy fermion compounds. This Kondo- or Anderson-lattice-like 'oxide-intermetallic' replaces the Mott insulator as the reference state from which superconductivity emerges upon doping.
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