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Atomic scale disorder and reconstruction in bulk infinite-layer nickelates lacking superconductivity

Author

Listed:
  • Kejun Hu

    (Institutes of Physical Science and Information Technology, Anhui University)

  • Qing Li

    (National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University)

  • Dongsheng Song

    (Institutes of Physical Science and Information Technology, Anhui University)

  • Yingze Jia

    (Institutes of Physical Science and Information Technology, Anhui University)

  • Zhiyao Liang

    (Institutes of Physical Science and Information Technology, Anhui University)

  • Shuai Wang

    (Institutes of Physical Science and Information Technology, Anhui University)

  • Haifeng Du

    (High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences)

  • Hai-Hu Wen

    (National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University)

  • Binghui Ge

    (Institutes of Physical Science and Information Technology, Anhui University)

Abstract

The recent discovery of superconductivity in infinite-layer nickelate films has sparked significant interest and expanded the realm of superconductors, in which the infinite-layer structure and proper chemical doping are both of the essence. Nonetheless, the reasons for the absence of superconductivity in bulk infinite-layer nickelates remain puzzling. Herein, we investigate atomic defects and electronic structures in bulk infinite-layer Nd0.8Sr0.2NiO2 using scanning transmission electron microscopy. Our observations reveal the presence of three-dimensional (3D) block-like structural domains resulting from intersecting defect structures, disrupting the continuity within crystal grains, which could be a crucial factor in giving rise to the insulating character and inhibiting the emergence of superconductivity. Moreover, the infinite-layer structure, without complete topotactic reduction, retains interstitial oxygen atoms on the Nd atomic plane in bulk nickelates, possibly further aggravating the local distortions of NiO2 planes and hindering the superconductivity. These findings shed light on the existence of structural and atomic defects in bulk nickelates and provide valuable insights into the influence of proper topotactic reduction and structural orders on superconductivity.

Suggested Citation

  • Kejun Hu & Qing Li & Dongsheng Song & Yingze Jia & Zhiyao Liang & Shuai Wang & Haifeng Du & Hai-Hu Wen & Binghui Ge, 2024. "Atomic scale disorder and reconstruction in bulk infinite-layer nickelates lacking superconductivity," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-49533-1
    DOI: 10.1038/s41467-024-49533-1
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