Unconventional Hall effects in a quasi-kagome Kondo Weyl semimetal candidate Ce$_3$TiSb$_5$

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

It is generally believed that electronic correlation, geometric frustration, and topology, \textit{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 systematic investigation on a quasi-kagome Kondo Weyl semimetal candidate Ce$_3$TiSb$_5$. A series of unconventional Hall effects are observed. 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 $\mu\Omega$ cm is found at low temperatures, which should be ascribed to the noncolinear magnetic structures of the frustrated quasi-kagome lattice. 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$_3$TiSb$_5$ 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.
准近代近藤韦尔半金属候选体 Ce$_3$TiSb$_5$ 中的非常规霍尔效应
人们普遍认为,电子相关性、几何挫折和拓扑结构(textit{individual})可以促进各种引人入胜的性质的出现,这些性质在基础研究和潜在应用方面都吸引了广泛的关注。在此,我们报告了对准近代近藤韦尔半金属候选物质 Ce$_3$TiSb$_5$ 的系统研究。我们观察到了一系列非常规霍尔效应。在顺磁相中,反常霍尔效应的减弱揭示了动态 c$-$f$ 杂化的特征,并与挫折促进的不相干近藤散射有关。在低温下发现了超过 0.2 $\mu\Omega$ cm 的巨大拓扑霍尔效应,这应该归因于沮度准卡戈米晶格的非共线性磁结构。此外,还发现了具有手性切换的奇特环形霍尔效应,推断这与磁畴壁有关,磁畴壁钉住了与历史相关的自旋手性和/或从隙内韦尔节点投射的费米弧表面态。这些奇特的结果将 Ce$_3$TiSb$_5$ 置于一个高度受挫的铁磁性致密近藤晶格体系中,该晶格在 "扩展 "的全局相图上具有非难拓扑结构,并突出了电子相关性、几何受挫性和拓扑结构之间的相互作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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