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.
@article{arxiv.2005.01298,
title = {Second-harmonic voltage responce for the magnetic Weyl semimetal Co$_3$Sn$_2$S$_2$},
author = {V. D. Esin and A. V. Timonina and N. N. Kolesnikov and E. V. Deviatov},
journal= {arXiv preprint arXiv:2005.01298},
year = {2021}
}