Abstract
The discovery of superconductivity in Nd0.8Sr0.2NiO2 (ref. 1) introduced a new family of layered nickelate superconductors that has now been extended to include a range of strontium doping2,3, praseodymium or lanthanum in place of neodymium4,5,6,7, and the five-layer compound Nd6Ni5O12 (ref. 8). A number of studies have indicated that electron correlations are strong in these materials9,10,11,12,13,14,15, a feature that often leads to the emergence of magnetism. Here we report muon spin rotation/relaxation studies of a series of superconducting infinite-layer nickelates. Regardless of the rare earth ion or doping, we observe an intrinsic magnetic ground state arising from local moments on the nickel sublattice. The coexistence of magnetism—which is likely to be antiferromagnetic and short-range ordered—with superconductivity is reminiscent of some iron pnictides16 and heavy fermion compounds17, and qualitatively distinct from the doped cuprates18.
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Data availability
All μSR data are available in the following permanent repositories: https://doi.org/10.16907/493c5efc-c6a8-45a7-a12f-27bfce87bd54 and https://doi.org/10.16907/d36143e7-a9d6-465b-8f6b-9af386bd0a8f. Histograms are also available together with the fitting software, on http://musruser.psi.ch. A run number directory is provided in section B of the Supplementary Information. Source data are provided with this paper.
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Acknowledgements
The work at Stanford/SLAC was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under contract no. DE-AC02-76SF00515, and Gordon and Betty Moore Foundation’s Emergent Phenomena in Quantum Systems Initiative through grant no. GBMF9072 (synthesis equipment). J.F. was also supported by the Swiss National Science Foundation through Postdoc.Mobility P400P2199297. J.F., M.H. and J.-M.T. acknowledge support from the Swiss National Science Foundation through Division II 200020_179155 and the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement no. 319286 (Q-MAC). D.L. acknowledges support from Hong Kong Research Grant Council (CityU 21301221) and National Natural Science Foundation of China (12174325). Part of this work is based on experiments performed at the Swiss Muon Source SμS, Paul Scherrer Institute, Villigen, Switzerland.
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J.F. and D.L. prepared and characterised the samples with support from M.O., B.Y.W., K.L. and Y.L. J.F., M.H. and A.S. carried out the μSR measurements with support from Z.S. and T.P. J.F. and A.S. analysed the data. M.M.M. provided the model for the energy-dependent data. J.F., M.H., J.-M.T., H.Y.H. and A.S. wrote the manuscript with input from all authors.
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Fowlie, J., Hadjimichael, M., Martins, M.M. et al. Intrinsic magnetism in superconducting infinite-layer nickelates. Nat. Phys. 18, 1043–1047 (2022). https://doi.org/10.1038/s41567-022-01684-y
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DOI: https://doi.org/10.1038/s41567-022-01684-y
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