Large Anomalous and Topological Hall Effect and Nernst Effect in a Dirac Kagome Magnet Fe3Ge
December 15, 2025
Neutron diffraction data collected at DEMAND instrument displays the peak intensity change along with magnetic transition; the insets show the schematic diagram of spin configurations of the magnetic phases.
Scientific Achievement
The Kagome lattice Fe3Ge exhibits topological Hall resistivity and Nernst effect. These phenomena are attributed to the Berry phase associated with the field-induced nonzero scalar spin chirality.
Significance and Impact
The results highlight the synergic effects of the Berry phases in both momentum and real space. With high magnetic ordering temperature, Fe3Ge could be a promising candidate for thermoelectric applications based on the Nernst effect.
Research Details
- Transport and thermoelectric measurement found topological Hall and topological Nernest effects in Fe3Ge.
- Neutron diffraction study solved the magnetic structure and illustrated that the spin reorientation occurs along with large anomalous Hall effect.
“Large Anomalous and Topological Hall Effect and Nernst Effect in a Dirac Kagome Magnet Fe3Ge, Advanced Functional Materials, 1, 11059 (2025)
https://doi/10.1002/adfm.202511059
