We experimentally investigate longitudinal and transverse second-harmonic voltage response to ac electrical current for a magnetic Weyl semimetal Co₃Sn₂S₂. In contrast to the previously observed Berry-curvature induced non-linear Hall effect for non-magnetic Weyl and Dirac semimetals, the second-harmonic transverse voltage demonstrates sophisticated interplay of different effects for Co₃Sn₂S₂. In high magnetic fields, it is of Seebeck-like square-B law, while the low-field behavior is found to be linear and sensitive to the direction of sample magnetization. The latter can be expected both for the non-linear Hall effect and for the surface state contribution to the Seebeck effect in Weyl semimetals. Thus, thermoelectric effects are significant in Co₃Sn₂S₂, unlike non-magnetic Weyl and Dirac materials.

中文翻译：

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磁性Weyl半金属Co 3 Sn 2 S 2的二次谐波电压响应

我们实验研究了磁性Weyl半金属Co ₃ Sn ₂ S ₂对交流电流的纵向和横向二次谐波电压响应。与先前观察到的贝里曲率引起的非磁性Weyl和Dirac半金属的非线性霍尔效应相反，二次谐波横向电压表现出Co ₃ Sn ₂ S ₂不同作用的复杂相互作用。。在高磁场中，它具有类似塞贝克（Seebeck）的平方B律，而低磁场行为是线性的，并且对样品磁化方向敏感。后者既可以用于非线性霍尔效应，也可以用于表面态对Weyl半金属中塞贝克效应的贡献。因此，与非磁性Weyl和Dirac材料不同，Co ₃ Sn ₂ S _2中的热电效应显着。