Source zotero
Authors Xiaolin Ren, Ronny Sutarto, Xianxin Wu, Jianfeng Zhang, Hai Huang, Tao Xiang, Jiangping Hu, Riccardo Comin, Xingjiang Zhou, Zhihai Zhu
arXiv / Publisher https://www.nature.com/articles/s42005-025-01971-z
PDF https://www.nature.com/articles/s42005-025-01971-z.pdf
Relevance score Not available in this batch.
Primary category Not available in this batch.
Published 2025-02-03
Research paradigm Experimental
Sample form Thin Film

Summary

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.

Materials

Methods

Keywords

  • charge transfer insulator
  • antiferromagnetism
  • collinear antiferromagnetic spin ordering
  • charge like anisotropy

Highlights

  • Resolving the electronic ground state of La3Ni2O7-δ films reveals a charge transfer nature and collinear antiferromagnetic spin ordering.
  • This investigation enriches the understanding of high-temperature superconductivity in La3Ni2O7-δ under high pressure.

Conclusions

  • Through X-ray absorption spectroscopy, the influence of oxygen ligands on the electronic ground states of the Ni ions is revealed, displaying a charge transfer nature akin to cuprate but with distinct orbital configurations.
  • In La3Ni2O7-δ films, a superlattice reflection (1/4, 1/4, L) at the Ni L absorption edge is detected using resonant X-ray scattering measurements.
  • By evaluating the reflection’s azimuthal angle dependence, the presence of collinear antiferromagnetic spin ordering and charge-like anisotropy ordered with the same periodicity is confirmed.
  • A microscopic relationship between these two components in the temperature dependence of the scattering intensity is found.

Main claims

Not available in this batch.

Workflow

Not available in this batch.