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Anomalous Hall effect in the antiferromagnetic Weyl semimetal SmAlSi



Yuxiang Gao, Shiming Lei, Eleanor Clements, Yichen Zhang, Xue-Jian Gao, Songxue Chi, Kam Law, Ming Yi, Jeffrey Lynn, Emilia Morosan


The intrinsic anomalous Hall effect (AHE) has been reported in numerous ferromagnetic (FM) Weyl semimetals. However, AHE in the antiferromagnetic (AFM) or paramagnetic (PM) state of Weyl semimetals has been rarely observed experimentally, and only in centrosymmetric materials. Different mechanisms have been proposed to establish the connection between the AHE and the type of magnetic order. In this paper, we report AHE in both the AFM and PM states of non-centrosymmetric compound SmAlSi. To account for the AHE in non-centrosymmetric Weyl semimetals without FM, we introduce a new mechanism based on magnetic field-induced Weyl nodes evolution. Angle-dependent quantum oscillations in SmAlSi provide evidence for the Weyl points and large AHE in both the PM and the AFM states. The proposed mechanism qualitatively explains the temperature dependence of the anomalous Hall conductivity (AHC), which displays unconventional power law behavior of the AHC in both AFM and PM states of SmAlSi.
Nature Partner Journals Quantum Materials


Anomalous Hall Effect, Weyl semimetal, SmAlSi, Long range antiferromagnetic order, non-centrosymmetric crystal structure


Gao, Y. , Lei, S. , Clements, E. , Zhang, Y. , Gao, X. , Chi, S. , Law, K. , Yi, M. , Lynn, J. and Morosan, E. (2023), Anomalous Hall effect in the antiferromagnetic Weyl semimetal SmAlSi, Nature Partner Journals Quantum Materials (Accessed July 20, 2024)


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Created October 17, 2023, Updated January 4, 2024