Orbital-selective effect of spin reorientation on the Dirac fermions in a non-charge-ordered kagome ferromagnet Fe3Ge
Kagome magnets provide a fascinating platform for the realization of correlated topological quantum phases under various magnetic ground states. However, the effect of the magnetic spin configurations on the characteristic electronic structure of the kagome-lattice layer remains elusive. Here, utilizing angle-resolved photoemission spectroscopy and density functional theory calculations, we report the spectroscopic evidence for the spin-reorientation effect of a kagome ferromagnet Fe<sub>3</sub>Ge, which is composed solely of kagome planes. As the Fe moments cant from the c-axis into the ab plane upon cooling, the two kinds of kagome-derived Dirac fermions respond quite differently. The one with less-dispersive bands (k<sub>z</sub> ~ 0) containing the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mn>3</mml:mn> <mml:msub><mml:mrow><mml:mi>d</mml:mi></mml:mrow> <mml:mrow> <mml:msup><mml:mrow><mml:mi>z</mml:mi></mml:mrow> <mml:mrow><mml:mn>2</mml:mn></mml:mrow> </mml:msup> </mml:mrow> </mml:msub> </mml:math> orbitals evolves from gapped into nearly gapless, while the other with linear dispersions (k<sub>z</sub> ~ π) embracing the 3d<sub>xz</sub>/3d<sub>yz</sub> components remains intact, suggesting that the effect of spin reorientation on the Dirac fermions has an orbital selectivity. Moreover, we demonstrate that there is no signature of charge order formation in Fe<sub>3</sub>Ge, contrasting with its sibling compound FeGe, a newly established charge-density-wave kagome magnet.
Authors
- Xuezhi Chen (ORCID: https://orcid.org/0000-0002-7421-6985)
- Yujie Sun (ORCID: https://orcid.org/0000-0003-1782-8405)
- Hechang Lei (ORCID: https://orcid.org/0000-0003-0850-8514)
- Qi Wang (ORCID: https://orcid.org/0000-0002-5049-629X)
- Bei Jiang (ORCID: https://orcid.org/0009-0001-2476-1133)
- Bernd Büchner (ORCID: https://orcid.org/0000-0002-3886-2680)
- Rui Lou (ORCID: https://orcid.org/0000-0002-4852-6189)
- Hongming Weng (ORCID: https://orcid.org/0000-0001-8021-9413)
- Zhonghao Liu (ORCID: https://orcid.org/0000-0001-7569-9731)
- Wenhua Song (ORCID: https://orcid.org/0000-0003-0605-6550)
- O. Rader (ORCID: https://orcid.org/0000-0003-3639-0971)
- Shancai Wang (ORCID: https://orcid.org/0000-0001-7564-9064)
- Man Li
- Liqin Zhou (ORCID: https://orcid.org/0000-0002-7415-2846)
- Alexander Fedorov (ORCID: https://orcid.org/0000-0002-9228-7082)
- Zhijun Tu
Institutions
- Ningbo University (CN)
- Chinese Academy of Sciences (CN)
- Helmholtz-Zentrum Berlin für Materialien und Energie (DE)
- Leibniz Institute for Solid State and Materials Research (DE)
- Southern University of Science and Technology (CN)
- ShanghaiTech University (CN)
- China People's Public Security University (CN)
- Songshan Lake Materials Laboratory (CN)
- Shanghai Institute of Applied Physics (CN)
- Quantum Design (Germany) (DE)
- Institute of Physics (CN)
- National Laboratory for Superconductivity (CN)
- University of Chinese Academy of Sciences (CN)
- Institute of Advanced Light Source Facilities Shenzhen (CN)
- Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (CN)
- Renmin University of China (CN)
Publication Details
- Journal
- Nature Communications
- Published
- 2024-11-13
- DOI
- https://doi.org/10.1038/s41467-024-53343-w
- Citations
- 9
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 3.04
Funders
- Natural Science Foundation of Shanghai
- Deutsche Forschungsgemeinschaft
- National Natural Science Foundation of China
- Bundesministerium für Bildung und Forschung
- Ningbo University
- Natural Science Foundation of Ningbo