Orbital-selective effect of spin reorientation on the Dirac fermions in a non-charge-ordered kagome ferromagnet Fe3Ge
Year: 2024
Type: article
Abstract: 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 Fe3Ge, 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 (kz ~ 0) containing the $$3{d}_{{z}^{2}}$$ 3 d z 2 orbitals evolves from gapped into nearly gapless, while the other with linear dispersions (kz ~ π) embracing the 3dxz/3dyz 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 Fe3Ge, contrasting with its sibling compound FeGe, a newly established charge-density-wave kagome magnet.
Source: Nature Communications
Institutions: Helmholtz-Zentrum Berlin für Materialien und Energie, Leibniz Institute for Solid State and Materials Research, Chinese Academy of Sciences, Institute of Physics, University of Chinese Academy of Sciences, Renmin University of China, ShanghaiTech University, China People's Public Security University, Ningbo University, Shanghai Institute of Applied Physics, Technische Universität Dresden, Southern University of Science and Technology, Institute of Advanced Light Source Facilities Shenzhen, Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area, Songshan Lake Materials Laboratory
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $5,416
OpenAlex ID: W4404310657