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Title: Electronic structure of the parent compound of superconducting infinite-layer nickelates

Abstract

The search continues for nickel oxide-based materials with electronic properties similar to cuprate high-temperature superconductors1,2,3,4,5,6,7,8,9,10. The recent discovery of superconductivity in the doped infinite-layer nickelate NdNiO2 (refs. 11,12) has strengthened these efforts. Here, we use X-ray spectroscopy and density functional theory to show that the electronic structure of LaNiO2 and NdNiO2, 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 3dx2−y2 symmetry in the NiO2 layers. Thus, the infinite-layer nickelate can be regarded as a sibling of the rare-earth intermetallics13,14,15, which are well known for heavy fermion behaviour, where the NiO2 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.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1605376
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Nature Materials
Additional Journal Information:
Journal Name: Nature Materials; Journal ID: ISSN 1476-1122
Country of Publication:
United States
Language:
English

Citation Formats

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., and Lee, W. S. Electronic structure of the parent compound of superconducting infinite-layer nickelates. United States: N. p., 2020. Web. doi:10.1038/s41563-019-0585-z.
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. Electronic structure of the parent compound of superconducting infinite-layer nickelates. United States. doi:10.1038/s41563-019-0585-z.
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., and Lee, W. S. Mon . "Electronic structure of the parent compound of superconducting infinite-layer nickelates". United States. doi:10.1038/s41563-019-0585-z.
@article{osti_1605376,
title = {Electronic structure of the parent compound of superconducting infinite-layer nickelates},
author = {Hepting, M. and Li, D. and Jia, C. J. and Lu, H. and Paris, E. and Tseng, Y. and Feng, X. and Osada, M. and Been, E. and Hikita, Y. and Chuang, Y. -D. and Hussain, Z. and Zhou, K. J. and Nag, A. and Garcia-Fernandez, M. and Rossi, M. and Huang, H. Y. and Huang, D. J. and Shen, Z. X. and Schmitt, T. and Hwang, H. Y. and Moritz, B. and Zaanen, J. and Devereaux, T. P. and Lee, W. S.},
abstractNote = {The search continues for nickel oxide-based materials with electronic properties similar to cuprate high-temperature superconductors1,2,3,4,5,6,7,8,9,10. The recent discovery of superconductivity in the doped infinite-layer nickelate NdNiO2 (refs. 11,12) has strengthened these efforts. Here, we use X-ray spectroscopy and density functional theory to show that the electronic structure of LaNiO2 and NdNiO2, 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 3dx2−y2 symmetry in the NiO2 layers. Thus, the infinite-layer nickelate can be regarded as a sibling of the rare-earth intermetallics13,14,15, which are well known for heavy fermion behaviour, where the NiO2 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.},
doi = {10.1038/s41563-019-0585-z},
journal = {Nature Materials},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {1}
}

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