The discovery of superconductivity in Nd_0.8Sr_0.2NiO₂ (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^4,5,6,7, and the five-layer compound Nd₆Ni₅O₁₂ (ref. ⁸). A number of studies have indicated that electron correlations are strong in these materials^{9,10,11,12,13,14,15}, 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.

Nd _0.8 Sr _0.2 NiO ₂超导性的发现（参考文献¹）引入了一个新的层状镍酸盐超导体系列，现已扩展到包括一系列锶掺杂^2,3、镨或镧代替钕^{4,5 ,6,7}和五层化合物 Nd ₆ Ni ₅ O ₁₂（参考文献⁸）。许多研究表明，这些材料中的电子相关性很强^{9,10,11,12,13,14,15}，这个特征往往会导致磁性的出现。在这里，我们报告了一系列超导无限层镍酸盐的 μ 子自旋旋转/弛豫研究。无论稀土离子或掺杂如何，我们都观察到由镍亚晶格上的局部矩引起的固有磁基态。磁性（可能是反铁磁性和短程有序）与超导性的共存让人想起一些铁磷化物¹⁶和重费米子化合物¹⁷，并且在质量上与掺杂的铜酸盐¹⁸不同。