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<p>The recent discovery of a superconductivity signature in La<sub>3</sub>Ni<sub>2</sub>O<sub>7-δ</sub> 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 La<sub>3</sub>Ni<sub>2</sub>O<sub>7-δ</sub> resembles the parent state of the cuprate superconductor, a charge transfer insulator with long-range antiferromagnetism. Through X-ray absorption spectroscopy, we reveal the 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. Additionally, in La<sub>3</sub>Ni<sub>2</sub>O<sub>7-δ</sub> films, we detect a superlattice reflection (1/4, 1/4, <i>L</i>) at the Ni <i>L</i> absorption edge using resonant X-ray scattering measurements. Further examination of the resonance profile indicates that the reflection originates from the Ni <i>d</i> orbitals. By evaluating the reflection’s azimuthal angle dependence, we confirm the presence of collinear antiferromagnetic spin ordering and charge-like anisotropy ordered with the same periodicity. 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 La<sub>3</sub>Ni<sub>2</sub>O<sub>7-δ</sub> under high pressure.</p>

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Resolving the electronic ground state of La3Ni2O7-δ films

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月3日

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  • Xiaolin Ren,
  • Ronny Sutarto,
  • Xianxin Wu,
  • Jianfeng Zhang,
  • Hai Huang,
  • Tao Xiang,
  • Jiangping Hu,
  • Riccardo Comin,
  • Xingjiang Zhou,
  • Zhihai Zhu

摘要

The recent discovery of a superconductivity signature in La3Ni2O7-δ 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-δ resembles the parent state of the cuprate superconductor, a charge transfer insulator with long-range antiferromagnetism. Through X-ray absorption spectroscopy, we reveal the 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. Additionally, in La3Ni2O7-δ films, we detect 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 confirm the presence of collinear antiferromagnetic spin ordering and charge-like anisotropy ordered with the same periodicity. 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-δ under high pressure.