Observation of an unexpected negative magnetoresistance in magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$

Abstract

Time-reversal symmetry breaking allows for a rich set of magneto-transport properties related to electronic topology. Focusing on the magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$, we prepared micro-ribbons and investigated their transverse and longitudinal transport properties from 100 K to 180 K in magnetic fields ${\mu }_{0}H$ up to 2T. We establish the presence of a magnetoresistance (MR) up to 1 % with a strong anisotropy depending the projection of $H$ on the easy-axis magnetization, which exceeds all other magnetoresistive effects. Based on detailed phenomenological modeling, we attribute the observed results with unexpected form of anisotropy to magnon MR resulting from magnon-electron coupling. Moreover, a similar angular dependence is also found in the transverse resistivity which we show to originate from the combination of ordinary Hall and anomalous Hall effects. Thus the interplay of magnetic and topological properties governs the magnetotransport features of this magnetic Weyl system.

7 pages, 6 figures

References in corpus (6)

• Intrinsic vs. extrinsic anomalous Hall effect in ferromagnets
• Zero-field Nernst effect in a ferromagnetic kagome-lattice Weyl-semimetal Co3Sn2S2
• Linear magnetization dependence of the intrinsic anomalous Hall effect
• Negative longitudinal magnetoresistance in Dirac and Weyl metals
• Magnetoresistance and anomalous Hall effect in micro-ribbons of the magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Field-dependent Shubnikov-de Haas oscillations in ferromagnetic Weyl semimetal Co3Sn2S2

Cited by in corpus (3)

• Electric and thermoelectric response for Weyl and multi-Weyl semimetals in planar Hall configurations including the effects of strain
• Direction-dependent conductivity in planar Hall set-ups with tilted Weyl/multi-Weyl semimetals
• Topological linear magnetoresistivity and thermoconductivity induced by noncentrosymmetric Berry curvature