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Published May 8, 2025 | Version Early View
Journal Article Open

Electronic Structure of Kramers Nodal‐Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare‐Earth Substitution

Creators

  • 1. ROR icon California Institute of Technology
  • 2. ROR icon University of Tokyo
  • 3. ROR icon Bariloche Atomic Centre
  • 4. ROR icon RIKEN Center for Emergent Matter Science
  • 5. ROR icon Tohoku University
  • 6. ROR icon National High Magnetic Field Laboratory
  • 7. ROR icon High Energy Accelerator Research Organization
  • 8. ROR icon Japan Synchrotron Radiation Research Institute

Abstract

Nodal-line semimetals are a class of topological materials hosting one dimensional lines of band degeneracy. Kramers nodal-line (KNL) metals/semimetals have recently been theoretically recognized as a class of topological states inherent to all non-centrosymmetric achiral crystal lattices. The electronic structure of candidate KNL semimetal YAuGe is investigated by angle-resolved photoemission spectroscopy (ARPES) and quantum oscillations as well as by density functional theory (DFT) calculations. DFT has revealed that YAuGe hosts KNLs on the Γ-A-L-M plane of the Brillouin zone, that are protected by the time reversal and mirror-inversion symmetries. Through ARPES and quantum oscillations, signatures of hole bands enclosing the Γ point are identified, and the observed splitting of quantum oscillation frequency with angle is attributed to spin-orbit-coupling-induced band splitting away from the KNLs. Furthermore, it is shown that the degeneracy of the nodal lines along the Γ-A line is lifted by the time-reversal-symmetry breaking when the Y is substituted by magnetic R ions (R = rare earth). This becomes a source of Berry curvature and contributes to the anomalous Hall effect in magnetic RAuGe. These findings establish RAuGe as a new class of KNL semimetals offering significant potential for engineering of anomalous magnetotransport properties via magnetic rare-earth substitution.

Copyright and License

© 2025 The Author(s). Advanced Science published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Acknowledgement

T.K. was supported by Ministry of Education Culture Sports Science and Technology (MEXT) Leading Initiative for Excellent Young Researchers (JPMXS0320200135) and Inamori Foundation. This study was partially supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant-in-Aid (Nos. 21K13874, 23K13068, JP19H05826, 19H01835, 22H00109, 22H04933, 23K22447, 21H05470), Institute of Quantum Information and Matter, an NSF Physics Frontier Center via PHY- 2317110 and Gordon and Betty Moore Foundation via GBMF12765. This work was partly performed under the GIMRT Program of the Institute for Materials Research, Tohoku University (Proposal No. 202203-HMKPA-0064). The experiment at National High Magnetic Field Laboratory (NHMFL), which is supported by National Science Foundation Cooperative Agreement No. DMR-2128556 and the State of Florida. The synchrotron ARPES experiments are performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2021G141) and the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2022B1332). The magnetization torque measurements were carried out by the joint research in the Institute for Solid State Physics, the University of Tokyo (No.202209-HMBXX-0088). This work was partly performed using the facilities of the Materials Design and Characterization Laboratory in the Institute for Solid State Physics, the University of Tokyo.

Supplemental Material

Supporting Information: advs12000-sup-0001-SuppMat.pdf

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Advanced Science - 2025 - Kurumaji - Electronic Structure of Kramers Nodal‐Line Semimetal YAuGe and Anomalous Hall Effect.pdf

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Additional details

Funding

Inamori Foundation
Japan Society for the Promotion of Science
21K13874
Japan Society for the Promotion of Science
23K13068
Japan Society for the Promotion of Science
JP19H05826
Japan Society for the Promotion of Science
19H01835
Japan Society for the Promotion of Science
22H00109
Japan Society for the Promotion of Science
22H04933
Japan Society for the Promotion of Science
23K22447
Japan Society for the Promotion of Science
21H05470
Gordon and Betty Moore Foundation
GBMF12765

Dates

Available
2025-05-08
Version of record online

Caltech Custom Metadata

Caltech groups
Division of Physics, Mathematics and Astronomy (PMA)
Publication Status
In Press