Local evidence for collective spin excitations in the distorted kagome antiferromagnet Pr3BWO9

K. Y. Zeng, F. Y. Song, Z. M. Tian, Qiao Chen, Shun Wang, Bo Liu, Shiliang Li, L. S. Ling, W. Tong, Long Ma, and Li Pi
Phys. Rev. B 104, 155150 – Published 27 October 2021
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  • INTRODUCTION
  • MATERIALS AND METHODS
  • RESULTS
  • DISCUSSIONS AND CONCLUSIONS
  • ACKNOWLEDGMENTS
    • Supplemental Material
    References

    Abstract

    We report a local probe investigation of the frustrated antiferromagnet Pr3BWO9 with a distorted kagome lattice. The absence of magnetic order or spin-freezing is indicated by a spectral analysis down to 0.3 K and by specific heat measurements down to 0.09 K. The Knight shifts show an upturn behavior with the sample cooling down, which is further suppressed by the external field. For the spin dynamics, gapped spin excitation is observed from the temperature dependence of spin-lattice relaxation rates, with the gap size proportional to the applied magnetic field intensity. Comparatively, an unexpected sharp peak is observed in the nuclear spin-spin relaxation rate data at T*∼4–5 K. These results indicate an unconventional persistent fluctuating paramagnetic ground state with antiferromagnetic collective spin excitations in the strongly frustrated spin system.

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    • Received 21 July 2021
    • Revised 14 September 2021
    • Accepted 18 October 2021

    DOI:https://doi.org/10.1103/PhysRevB.104.155150

    ©2021 American Physical Society

    Physics Subject Headings (PhySH)

    1. Physical Systems
    AntiferromagnetsKagome latticeStrongly correlated systems
    1. Techniques
    Nuclear magnetic resonance
    Condensed Matter, Materials & Applied Physics

    Authors & Affiliations

    K. Y. Zeng1,2, F. Y. Song3, Z. M. Tian3,*, Qiao Chen4, Shun Wang4, Bo Liu5,6, Shiliang Li5,6, L. S. Ling1, W. Tong1, Long Ma1,†, and Li Pi1,2

    • 1Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China
    • 2Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
    • 3School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China
    • 4School of Physics and MOE Key Laboratory of Fundamental Physical quantum Physics, PGMF, Huazhong University of Science and Technology, Wuhan 430074, China
    • 5Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
    • 6School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China

    • *tianzhaoming@hust.edu.cn
    • †malong@hmfl.ac.cn

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    Issue

    Vol. 104, Iss. 15 — 15 October 2021

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