Anisotropic transport properties and topological Hall effect in the annealed kagome antiferromagnet FeGe

Abstract

Electron correlation often gives birth to various orders in quantum materials. Recently, a strongly correlated kagome antiferromagnet FeGe is discovered to undergo a charge density wave transition inside the A-type antiferromagnetic state, providing an opportunity to explore the interplay between charge order and magnetism. Here, we reported the observation of anisotropic resistivity and Hall effect, along with a topological Hall effect, in the annealed FeGe crystals. As the current flows along the \emph{ab}-plane, the temperature dependence of ${\rho }_{ab}$ exhibits a distinct resistivity loop related to a first-order transition at $T_{cdw}$. The applied magnetic fields do not alter $T_{cdw}$ but can induce a spin-flop transition at $H_{sf}$. Consequently, a field-induced large topological Hall effect is observed in the canting antiferromagnetic (CAFM) state below $T_{cant}$, which is possibly attributed to the non-trivial spin texture during the spin-flop process. Whereas, as current is parallel to \emph{c}-axis, both the field-induced transitions in ${\rho }_c$ and ${\chi }_c$ disappear. Instead, the Hall resistivity in the annealed FeGe significantly exhibits a deviation from the linear field-dependent. These findings provide valuable insight into revealing the interplay among magnetism, charge order and topology in the kagome magnets.

8 pages, 5 figures

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Cited by in corpus (5)

• Anomalous-Hall Neel textures in altermagnetic materials
• Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe
• Anomalous Hall and Nernst effects in the Two-Dimensional ferromagnetic metal FePd2Te2
• Anomalous Nernst Effect and Its Implications for Time-Reversal Symmetry Breaking in Kagome Metal ScV6Sn6
• Epitaxial growth and magneto-transport properties of kagome metal FeGe thin films