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  • Letter
  • Open Access

Effect of Pr-doping and oxygen vacancies on spin density wave in La3Ni2O7−δ: A µSR investigation

Kaiwen Chen1,*, Xiangqi Liu2,*, Ying Wang1,*, Jiyuan Han1, Ziyi Zhu3, Jiachen Jiao1, Chengyu Jiang1, Yanfeng Guo2,4, Changlin Zheng1 et al.

Lei Shu1,5,†

  • 1State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200438, China
  • 2School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
  • 3School of Materials, Zhengzhou University of Aeronautics, Zhengzhou 450046, China
  • 4ShanghaiTech Laboratory for Topological Physics, Shanghai 201210, China
  • 5Shanghai Research Center for Quantum Sciences, Shanghai 201315, China

  • *These authors contributed equally to this work.
  • †Contact author: leishu@fudan.edu.cn
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Phys. Rev. Research 7, L032014 – Published 15 July, 2025

DOI: https://doi.org/10.1103/blkt-x2ps

Abstract

Here we report the positive muon spin relaxation study on Pr-doped La1.9Pr1.1Ni2O6.97 and oxygen-deficient La3Ni2O6.63 polycrystalline under ambient pressure. Zero-field μ+SR experiments reveal the existence of bulk long-range magnetic order in La1.9Pr1.1Ni2O6.97 with TN=161K, while La3Ni2O6.63 exhibits a short-range magnetic ground state with TN=15K. The microscopic magnetism of La1.9Pr1.1Ni2O6.97 is similar to the La3Ni2O7 with ideal stoichiometry. A comparison with lightly oxygen-deficient La3Ni2O6.92 reveals a crossover in magnetic dimensionality from three dimensional in La1.9Pr1.1Ni2O6.97 to two dimensional in La3Ni2O6.92. Our μ+SR experimental results reveal the destructive effect of apical-oxygen deficiencies on both intraplane and interplane magnetic correlation. On the other hand, Pr doping does not significantly alter the microscopic magnetism of La3Ni2O7.

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Phys. Rev. Research 7, L032014– Published 15 July, 2025
  • Received 24 December 2024
  • Revised 16 April 2025
  • Accepted 23 June 2025
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