论文标题
在$ d^{9-δ} $ nickelate中的强大superexchange均由共鸣X射线散射揭示
Strong Superexchange in a $d^{9-δ}$ Nickelate Revealed by Resonant Inelastic X-Ray Scattering
论文作者
论文摘要
在$ d^{9-δ} $镍中发现超导性的启发了有关此类材料基本物理学的不同理论观点。一个关键的问题是磁性汇合的幅度，它与是否可以实现类似铜矿的高温超导性的高度。我们使用还原的三层镍盐$ d^{9-1/3} $ LA4NI3O8和相关的理论建模的Ni L-EDGE和O K-EDGE光谱解决了这个问题。观察到最近的邻居磁性交换$ j = 69（4）4 $ MEV，这是$ d^{9-δ} $镍可以托管大型的superexchange。该值以及从我们的o k边缘数据估算的NI-O杂交的值意味着三层镍代表了无限层镍和酸酯之间的中间情况，并暗示它们代表了一种有希望的途径迈向更高的镍镍镍超导能力。
The discovery of superconductivity in a $d^{9-δ}$ nickelate has inspired disparate theoretical perspectives regarding the essential physics of this class of materials. A key issue is the magnitude of the magnetic superexchange, which relates to whether cuprate-like high-temperature nickelate superconductivity could be realized. We address this question using Ni L-edge and O K-edge spectroscopy of the reduced trilayer nickelate $d^{9-1/3}$ La4Ni3O8 and associated theoretical modeling. A magnon energy scale of ~80 meV resulting from a nearest-neighbor magnetic exchange of $J = 69(4)4$ meV is observed, proving that $d^{9-δ}$ nickelates can host a large superexchange. This value, along with that of the Ni-O hybridization estimated from our O K-edge data, implies that trilayer nickelates represent an intermediate case between the infinite-layer nickelates and the cuprates, and suggests that they represent a promising route towards higher-temperature nickelate superconductivity.
