论文标题
无限层镍中超导临界场的稀土控制
Rare-Earth Control of the Superconducting Upper Critical Field in Infinite-Layer Nickelates
论文作者
论文摘要
在超导无限层镍盐中改变稀土元素的后果已经引起了很多争议。在这里，我们在LA-，PR-和ND尼克拉群岛上的超导临界场的大小和各向异性上显示出明显的差异。这5个区别源于晶格中稀土离子的4F电子特性：la3+不存在它们，对于pr3+单重态基态而非磁性，并为ND3+ Kramer的Doublet磁性。可以理解，在ND肺泡中发现的独特的极性和方位角依赖性磁倍率是由ND3+ 4F矩的磁性贡献引起的。在没有稀土作用的情况下，我们发现镍含量广泛违反了Pauli的极限。这种健壮且可调的超导性表明将来的高场应用中有潜力。
The consequences of varying the rare-earth element in the superconducting infinite-layer nickelates have been much debated. Here we show striking differences in the magnitude and anisotropy of the superconducting upper critical field across the La-, Pr-, and Nd-nickelates. These 5 distinctions originate from the 4f electron characteristics of the rare-earth ions in the lattice: they are absent for La3+, nonmagnetic for the Pr3+ singlet ground state, and magnetic for the Nd3+ Kramer's doublet. The unique polar and azimuthal angle-dependent magnetoresistance found in the Nd-nickelates can be understood to arise from the magnetic contribution of the Nd3+ 4f moments. In the absence of rare-earth effects, we find that the nickelates broadly violate the Pauli limit. Such robust and tunable superconductivity suggests potential in future high-field applications.
