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Weyl nodal ring states and Landau quantization with very large magnetoresistance in square-net magnet EuGa4

Author

Listed:
  • Shiming Lei

    (Rice University
    Rice University)

  • Kevin Allen

    (Rice University
    Rice University)

  • Jianwei Huang

    (Rice University
    Rice University)

  • Jaime M. Moya

    (Rice University
    Rice University
    Rice University)

  • Tsz Chun Wu

    (Rice University
    Rice University)

  • Brian Casas

    (National High Magnetic Field Laboratory)

  • Yichen Zhang

    (Rice University
    Rice University)

  • Ji Seop Oh

    (Rice University
    Rice University
    University of California)

  • Makoto Hashimoto

    (SLAC National Accelerator Laboratory)

  • Donghui Lu

    (SLAC National Accelerator Laboratory)

  • Jonathan Denlinger

    (Lawrence Berkeley National Laboratory)

  • Chris Jozwiak

    (Lawrence Berkeley National Laboratory)

  • Aaron Bostwick

    (Lawrence Berkeley National Laboratory)

  • Eli Rotenberg

    (Lawrence Berkeley National Laboratory)

  • Luis Balicas

    (National High Magnetic Field Laboratory
    Florida State University)

  • Robert Birgeneau

    (University of California
    Lawrence Berkeley National Laboratory)

  • Matthew S. Foster

    (Rice University
    Rice University)

  • Ming Yi

    (Rice University
    Rice University)

  • Yan Sun

    (Institute of Metal Research, Chinese Academy of Sciences)

  • Emilia Morosan

    (Rice University
    Rice University)

Abstract

Magnetic topological semimetals allow for an effective control of the topological electronic states by tuning the spin configuration. Among them, Weyl nodal line semimetals are thought to have the greatest tunability, yet they are the least studied experimentally due to the scarcity of material candidates. Here, using a combination of angle-resolved photoemission spectroscopy and quantum oscillation measurements, together with density functional theory calculations, we identify the square-net compound EuGa4 as a magnetic Weyl nodal ring semimetal, in which the line nodes form closed rings near the Fermi level. The Weyl nodal ring states show distinct Landau quantization with clear spin splitting upon application of a magnetic field. At 2 K in a field of 14 T, the transverse magnetoresistance of EuGa4 exceeds 200,000%, which is more than two orders of magnitude larger than that of other known magnetic topological semimetals. Our theoretical model suggests that the non-saturating magnetoresistance up to 40 T arises as a consequence of the nodal ring state.

Suggested Citation

  • Shiming Lei & Kevin Allen & Jianwei Huang & Jaime M. Moya & Tsz Chun Wu & Brian Casas & Yichen Zhang & Ji Seop Oh & Makoto Hashimoto & Donghui Lu & Jonathan Denlinger & Chris Jozwiak & Aaron Bostwick , 2023. "Weyl nodal ring states and Landau quantization with very large magnetoresistance in square-net magnet EuGa4," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-40767-z
    DOI: 10.1038/s41467-023-40767-z
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    References listed on IDEAS

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