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<p>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 <i>ab</i>-plane, the temperature dependence of <i>ρ</i><sub><i>ab</i></sub> exhibits a distinct resistivity loop related to a first-order transition at <i>T</i><sub><i>cdw</i></sub>. The applied magnetic fields do not alter <i>T</i><sub><i>cdw</i></sub> but can induce a spin-flop transition at <i>H</i><sub><i>sf</i></sub>. Consequently, a field-induced large topological Hall effect is observed in the canting antiferromagnetic (CAFM) state below <i>T</i><sub><i>cant</i></sub>, which is possibly attributed to the non-trivial spin texture during the spin-flop process. Whereas, as current is parallel to <i>c</i>-axis, both the field-induced transitions in <i>ρ</i><sub><i>c</i></sub> and <i>χ</i><sub><i>c</i></sub> 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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • Jiajun Ma,
  • Chenfei Shi,
  • Yantao Cao,
  • Yuwei Zhang,
  • Yazhou Li,
  • Jiaxing Liao,
  • Jialu Wang,
  • Wenhe Jiao,
  • Hanjie Guo,
  • Chenchao Xu,
  • Shixun Cao,
  • Jianhui Dai,
  • Jin-Ke Bao,
  • Yuke Li

摘要

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 ab-plane, the temperature dependence of ρab exhibits a distinct resistivity loop related to a first-order transition at Tcdw. The applied magnetic fields do not alter Tcdw but can induce a spin-flop transition at Hsf. Consequently, a field-induced large topological Hall effect is observed in the canting antiferromagnetic (CAFM) state below Tcant, which is possibly attributed to the non-trivial spin texture during the spin-flop process. Whereas, as current is parallel to c-axis, both the field-induced transitions in ρc and χc 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.