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Second-Harmonic Voltage Response for the Magnetic Weyl Semimetal Co 3 Sn 2 S 2
JETP Letters ( IF 1.4 ) Pub Date : 2020-06-15 , DOI: 10.1134/s0021364020120024
V. D. Esin , A. V. Timonina , N. N. Kolesnikov , E. V. Deviatov

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:

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。
更新日期:2020-06-15
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