论文标题
超导无限层镍的内在磁性
Intrinsic magnetism in superconducting infinite-layer nickelates
论文作者
论文摘要
在nd $ _ {0.8} $ sr $ _ {0.2} $ nio $ _2 $ [1]中发现超导性的发现，引入了一个新的分层镍超导体家族，现在已扩展到包括一系列sr-poping [2，3]，pr或la nd [4--6]和5-layere nd $ _6 $ ni $ _5 $ o $ _ {12} $ [7]。许多研究表明，这些材料中的电子相关性很强[8-14]，因此一个核心问题是由于这些相互作用是否存在磁性。在这里，我们报告了一系列超导无限层镍盐的MUON自旋旋转/松弛研究。在所有情况下，我们都会观察到固有的磁接地状态，无论稀土离子或掺杂量如何，都是由镍sublattice上的局部矩引起的。具有超导性的磁性共存 - 可能是抗磁磁性和短距离有序的 - 让人联想到某些铁pnictides [15]和繁重的费米亚化合物[16]，并且与掺杂的丘比特质子[17]有质量的不同[17]。
The discovery of superconductivity in Nd$_{0.8}$Sr$_{0.2}$NiO$_2$ [1] introduced a new family of layered nickelate superconductors that has now been extended to include a range of Sr-doping [2, 3], Pr or La in place of Nd [4-6], and the 5-layer Nd$_6$Ni$_5$O$_{12}$ [7]. A number of studies indicate that electron correlations are strong in these materials [8-14], and hence a central question is whether or not magnetism is present as a consequence of these interactions. Here we report muon spin rotation/relaxation studies of a series of superconducting infinite-layer nickelates. In all cases we observe an intrinsic magnetic ground state, regardless of the rare earth ion or doping, 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 [15] and heavy fermion compounds [16], and qualitatively distinct from the doped cuprates [17].
