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<p>It is generally believed that electronic correlation, geometric frustration, and topology, <i>individually</i>, can facilitate the emergence of various intriguing properties that have attracted a broad audience for both fundamental research and potential applications. Here, we report a series of unconventional Hall effects observed in a <i>single</i> compound—quasi-kagome Kondo Weyl semimetal candidate Ce<sub>3</sub>TiSb<sub>5</sub>. In the paramagnetic phase, signature of dynamic <i>c</i>-<i>f</i> hybridization is revealed by a reduction of anomalous Hall effect and is connected to frustration-promoted incoherent Kondo scattering. A large topological Hall effect exceeding 0.2 <i>μ</i>Ω&#xa0;⋅&#xa0;cm is found at low temperatures, which should be ascribed to the non-collinear magnetic texture. In addition, a peculiar loop-shaped Hall effect with switching chirality is also seen, which is inferred to be associated with magnetic domain walls that pin history-dependent spin chirality and/or Fermi-arc surface states projected from the in-gap Weyl nodes. These exotic results place Ce<sub>3</sub>TiSb<sub>5</sub> in a regime of highly-frustrated antiferromagnetic dense Kondo lattice with a nontrivial topology on an “extended” global phase diagram, and highlight the interplay among electronic correlation, geometric frustration and topology.</p><p></p>

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Rich unconventional Hall effects in a single quasi-kagome Kondo Weyl semimetal candidate Ce3TiSb5

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月25日

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  • Xiaobo He,
  • Ying Li,
  • Yongheng Ge,
  • Hai Zeng,
  • Shi-Jie Song,
  • Jie Liu,
  • Shuo Zou,
  • Zhuo Wang,
  • Yuke Li,
  • Wenxin Ding,
  • Jianhui Dai,
  • Guang-Han Cao,
  • Xiao-Xiao Zhang,
  • Tianyou Zhai,
  • Gang Xu,
  • Yongkang Luo

摘要

It is generally believed that electronic correlation, geometric frustration, and topology, individually, can facilitate the emergence of various intriguing properties that have attracted a broad audience for both fundamental research and potential applications. Here, we report a series of unconventional Hall effects observed in a single compound—quasi-kagome Kondo Weyl semimetal candidate Ce3TiSb5. In the paramagnetic phase, signature of dynamic c-f hybridization is revealed by a reduction of anomalous Hall effect and is connected to frustration-promoted incoherent Kondo scattering. A large topological Hall effect exceeding 0.2 μΩ ⋅ cm is found at low temperatures, which should be ascribed to the non-collinear magnetic texture. In addition, a peculiar loop-shaped Hall effect with switching chirality is also seen, which is inferred to be associated with magnetic domain walls that pin history-dependent spin chirality and/or Fermi-arc surface states projected from the in-gap Weyl nodes. These exotic results place Ce3TiSb5 in a regime of highly-frustrated antiferromagnetic dense Kondo lattice with a nontrivial topology on an “extended” global phase diagram, and highlight the interplay among electronic correlation, geometric frustration and topology.