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

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, Eli Rotenberg, Luis Balicas, Robert Birgeneau, Matthew S. Foster, Ming Yi, Yan Sun () and Emilia Morosan ()
Additional contact information
Shiming Lei: Rice University
Kevin Allen: Rice University
Jianwei Huang: Rice University
Jaime M. Moya: Rice University
Tsz Chun Wu: Rice University
Brian Casas: National High Magnetic Field Laboratory
Yichen Zhang: Rice University
Ji Seop Oh: Rice University
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
Robert Birgeneau: University of California
Matthew S. Foster: Rice University
Ming Yi: Rice University
Yan Sun: Institute of Metal Research, Chinese Academy of Sciences
Emilia Morosan: Rice University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-40767-z

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