Spin structure and dynamics of the topological semimetal Co3Sn2-xInxS2
Spin structure and dynamics of the topological semimetal Co3Sn2-xInxS2
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DOI：
10.1038/s41535-022-00523-w
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发表时间：
2022-11
影响因子：
5.7
通讯作者：
Kelly J. Neubauer;F. Ye;Yue Shi;P. Malinowski;B. Gao;K. Taddei;P. Bourges;A. Ivanov;J. Chu;P. Dai
中科院分区：
文献类型：
--
作者：
Kelly J. Neubauer;F. Ye;Yue Shi;P. Malinowski;B. Gao;K. Taddei;P. Bourges;A. Ivanov;J. Chu;P. Dai
反常霍尔效应（AHE），通常在铁磁（FM）金属中观察到，具有破缺的时间反转对称性，取决于电子和磁性。在Co 3Sn 2-xInxS 2中，一个巨大的AHE被归因于与FM Weyl半金属相相关的Berry曲率，但最近的研究报告了复杂的磁性。我们使用中子散射来确定自旋动力学和结构作为x的函数，并提供了一个微观的理解AHE和磁性的相互作用。自旋间隙和刚度表明从外尔费米子的贡献与AHE一致。磁结构从轴向铁磁性到轴向磁矩约简的倾斜反铁磁结构，在轴向磁矩约简的倾斜反铁磁结构，在轴向磁矩进一步约简的倾斜反铁磁结构。由于非共线自旋可以在真实的空间中诱导非零的Berry曲率作为虚拟磁场，我们的结果揭示了另一个AHE贡献，建立了磁性对运输的影响。
The anomalous Hall effect (AHE), typically observed in ferromagnetic (FM) metals with broken time-reversal symmetry, depends on electronic and magnetic properties. In Co3Sn2-xInxS2, a giant AHE has been attributed to Berry curvature associated with the FM Weyl semimetal phase, yet recent studies report complicated magnetism. We use neutron scattering to determine the spin dynamics and structures as a function ofxand provide a microscopic understanding of the AHE and magnetism interplay. Spin gap and stiffness indicate a contribution from Weyl fermions consistent with the AHE. The magnetic structure evolves fromc-axis ferromagnetism atto a canted antiferromagnetic (AFM) structure with reducedc-axis moment and in-plane AFM order atand further reducedc-axis FM moment at. Since noncollinear spins can induce non-zero Berry curvature in real space acting as a fictitious magnetic field, our results revealed another AHE contribution, establishing the impact of magnetism on transport.