Intrinsic magnetism in superconducting infinite-layer nickelates

作者：Fowlie, Jennifer^*; Hadjimichael, Marios; Martins, Maria M.; Li, Danfeng; O***a, Motoki; Wang, Bai Yang; Lee, Kyuho; Lee, Yonghun; Salman, Zaher; Prokscha, Thomas; Triscone, Jean-Marc; Hwang, Harold Y.^*; Suter, Andreas^*

来源：Nature Protocols, 2022, 18(9): 1043-+.

DOI：10.1038/s41567-022-01684-y

• SPIN
• EXCITATIONS

The discovery of superconductivity in Nd0.8Ar0.2NiO2 (ref. (1)) introduced a new family of layered nickelate superconductors that has now been extended to include a range of strontium doping(2,3), praseodymium or lanthanum in place of neodymium(4-7), and the five-layer compound Nd6Ni5O12 (ref. (8)). A number of studies have indicated that electron correlations are strong in these materials(9-15), 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 pnictides(16) and heavy fermion compounds(17), and qualitatively distinct from the doped cuprates(18).