Electronic Structure of Kramers Nodal‐Line Semimetal YAuGe and Anomalous Hall Effect Induced by Magnetic Rare‐Earth Substitution
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.
Authors
- Masato Sakano
- T. Arima (ORCID: https://orcid.org/0000-0002-6959-0454)
- Natsuki Mitsuishi (ORCID: https://orcid.org/0000-0002-1120-9577)
- Koichi Kindo
- Shusaku Imajo (ORCID: https://orcid.org/0000-0001-9870-3596)
- Motoi Kimata (ORCID: https://orcid.org/0000-0003-4936-2988)
- Linda Ye (ORCID: https://orcid.org/0000-0001-7949-1356)
- Miho Kitamura (ORCID: https://orcid.org/0000-0002-9961-9019)
- Masaki Gen (ORCID: https://orcid.org/0000-0003-1362-7323)
- Jorge I. Facio (ORCID: https://orcid.org/0000-0002-8506-2512)
- Takashi Kurumaji (ORCID: https://orcid.org/0000-0002-2157-3727)
- Kohei Yamagami
- K. Ishizaka (ORCID: https://orcid.org/0000-0002-1710-7176)
- David E Graf (ORCID: https://orcid.org/0000-0001-6195-0462)
Institutions
- California Institute of Technology (US)
- High Energy Accelerator Research Organization (JP)
- Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
- Tokyo University of Science (JP)
- Tohoku University (JP)
- Balseiro Institute (AR)
- Bariloche Atomic Centre (AR)
- Japan Synchrotron Radiation Research Institute (JP)
- RIKEN Center for Emergent Matter Science (JP)
- National High Magnetic Field Laboratory (US)
- The University of Tokyo (JP)
Publication Details
- Journal
- Advanced Science
- Published
- 2025-05-08
- DOI
- https://doi.org/10.1002/advs.202501669
- Citations
- 3
- Primary Topic
- Rare-earth and actinide compounds
- Type
- article
- Field-Weighted Citation Impact
- 3.77
Funders
- National Science Foundation
- Gordon and Betty Moore Foundation
- National High Magnetic Field Laboratory
- Ministry of Education, Culture, Sports, Science and Technology
- Inamori Foundation
- University of Tokyo
- Japan Society for the Promotion of Science
- Institute for Materials Research, Tohoku University
- Division of Materials Research
- High Magnetic Field Laboratory, Chinese Academy of Sciences