Resolving the Electronic Ground State of La3Ni2O7-δ Films

Xiaolin Ren, Ronny Sutarto, Xianxin Wu, Jianfeng Zhang, Hai Huang, Tao Xiang, Jiangping Hu, Riccardo Comin, X. J. Zhou, Zhihai Zhu
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Abstract

The recent discovery of a superconductivity signature in La3Ni2O7-{\delta} under a pressure of 14 GPa, with a superconducting transition temperature of around 80 K, has attracted considerable attention. An important aspect of investigating electronic structures is discerning the extent to which the electronic ground state of La3Ni2O7-{\delta} resembles the parent state of the cuprate superconductor, a charge transfer insulator with long-range antiferromagnetism. Through X-ray absorption spectroscopy, we have uncovered the crucial influence of oxygen ligands on the electronic ground states of the Ni ions, displaying a charge transfer nature akin to cuprate but with distinct orbital configurations. Both in-plane and out-of-plane Zhang-Rice singlets associated with Ni d_(x^2-y^2 ) and d_(z^2) orbitals are identified, together with a strong interlayer coupling through inner apical oxygen. Additionally, in La3Ni2O7-{\delta} films, we have detected a superlattice reflection (1/4, 1/4, L) at the Ni L absorption edge using resonant X-ray scattering measurements. Further examination of the resonance profile indicates that the reflection originates from the Ni d orbitals. By evaluating the reflection's azimuthal angle dependence, we have confirmed the presence of collinear antiferromagnetic spin ordering and charge-like anisotropy ordered with the same periodicity. Notably, our findings reveal a microscopic relationship between these two components in the temperature dependence of the scattering intensity of the reflection. This investigation enriches our understanding of high-temperature superconductivity in La3Ni2O7-{\delta} under high pressure.
解析 La3Ni2O7-δ 薄膜的电子基态
最近在 14 GPa 压力下的 La3Ni2O7-{delta} 中发现了超导特征,其超导转变温度约为 80 K,这引起了人们的极大关注。研究电子结构的一个重要方面是辨别 La3Ni2O7-{delta} 的电子基态在多大程度上与杯状超导体的母态相似,后者是一种具有长程反铁磁性的电荷转移绝缘体。通过 X 射线吸收光谱,我们发现了氧配位体对镍离子电子基态的关键影响,其电荷转移性质与铜氧化物相似,但具有不同的矢量构型。我们发现了与镍的 d_(x^2-y^2 ) 和 d_(z^2) 轨道相关的面内和面外 Zhang-Rice 单电子,以及通过内顶端氧的强层间耦合。此外,在 La3Ni2O7-{delta} 薄膜中,我们利用共振 X 射线散射测量在 Ni L 吸收边缘检测到了超晶格反射(1/4,1/4,L)。通过评估反射的方位角依赖性,我们证实了共线反铁磁有序和电荷类各向异性以相同的周期有序存在。这项研究丰富了我们对La3Ni2O7-{delta}在高压下的高温超导性的理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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