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Observation of an unexpected negative magnetoresistance in magnetic weyl semimetal Co3Sn2S2

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2022

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Moghaddam, Ali G.
Geishendorf, Kevin
Schlitz, Richard
Facio, Jorge I.
Vir, Praveen
Shekhar, Chandra
Felser, Claudia
Nielsch, Kornelius
Thomas, Andy
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https://doi.org/10.1016/j.mtphys.2022.100896
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http://arxiv.org/abs/2211.09798

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Materials Today Physics. Elsevier. 2022, 29, 100896. eISSN 2542-5293. Available under: doi: 10.1016/j.mtphys.2022.100896

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Time-reversal symmetry breaking allows for a rich set of magneto-transport properties related to electronic topology. Focusing on the magnetic Weyl semimetal Co3Sn2S2, we prepared micro-ribbons and investigated their transverse and longitudinal transport properties from 100 K to 180 K in magnetic fields μ0H up to 2 T. 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.

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ISO 690MOGHADDAM, Ali G., Kevin GEISHENDORF, Richard SCHLITZ, Jorge I. FACIO, Praveen VIR, Chandra SHEKHAR, Claudia FELSER, Kornelius NIELSCH, Sebastian T. B. GOENNENWEIN, Andy THOMAS, 2022. Observation of an unexpected negative magnetoresistance in magnetic weyl semimetal Co3Sn2S2. In: Materials Today Physics. Elsevier. 2022, 29, 100896. eISSN 2542-5293. Available under: doi: 10.1016/j.mtphys.2022.100896
BibTex
@article{Moghaddam2022Obser-59642,
  year={2022},
  doi={10.1016/j.mtphys.2022.100896},
  title={Observation of an unexpected negative magnetoresistance in magnetic weyl semimetal Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub>},
  volume={29},
  journal={Materials Today Physics},
  author={Moghaddam, Ali G. and Geishendorf, Kevin and Schlitz, Richard and Facio, Jorge I. and Vir, Praveen and Shekhar, Chandra and Felser, Claudia and Nielsch, Kornelius and Goennenwein, Sebastian T. B. and Thomas, Andy},
  note={Article Number: 100896}
}
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