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Signatures of the Magnetic Entropy in the Thermopower Signals in Nanoribbons of the Magnetic Weyl Semimetal Co3Sn2S2

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2020

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Geishendorf, Kevin
Vir, Praveen
Shekhar, Chandra
Felser, Claudia
Facio, Jorge I.
van den Brink, Jeroen
Nielsch, Kornelius
Thomas, Andy

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https://doi.org/10.1021/acs.nanolett.9b03822
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Nano Letters. American Chemical Society (ACS). 2020, 20(1), pp. 300-305. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.9b03822

Zusammenfassung

Weyl semimetals exhibit interesting electronic properties due to their topological band structure. In particular, large anomalous Hall and anomalous Nernst signals are often reported, which allow for a detailed and quantitative study of subtle features. We pattern single crystals of the magnetic Weyl semimetal Co3Sn2S2 into nanoribbon devices using focused ion beam cutting and optical lithography. This approach enables a very precise study of the galvano- and thermomagnetic transport properties. Indeed, we found interesting features in the temperature dependency of the anomalous Hall and Nernst effects. We present an analysis of the data based on the Mott relation and identify in the Nernst response signatures of magnetic fluctuations enhancing the anomalous Nernst conductivity at the magnetic phase transition.

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530 Physik

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magnetic Weyl semimet, anomalous Hall effect, anomalous Nernst effect, Mott relation, phase transition, thermomagnetic transport

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ISO 690GEISHENDORF, Kevin, Praveen VIR, Chandra SHEKHAR, Claudia FELSER, Jorge I. FACIO, Jeroen VAN DEN BRINK, Kornelius NIELSCH, Andy THOMAS, Sebastian T. B. GOENNENWEIN, 2020. Signatures of the Magnetic Entropy in the Thermopower Signals in Nanoribbons of the Magnetic Weyl Semimetal Co3Sn2S2. In: Nano Letters. American Chemical Society (ACS). 2020, 20(1), pp. 300-305. ISSN 1530-6984. eISSN 1530-6992. Available under: doi: 10.1021/acs.nanolett.9b03822
BibTex
@article{Geishendorf2020-01-08Signa-51907,
  year={2020},
  doi={10.1021/acs.nanolett.9b03822},
  title={Signatures of the Magnetic Entropy in the Thermopower Signals in Nanoribbons of the Magnetic Weyl Semimetal Co<sub>3</sub>Sn<sub>2</sub>S<sub>2</sub>},
  number={1},
  volume={20},
  issn={1530-6984},
  journal={Nano Letters},
  pages={300--305},
  author={Geishendorf, Kevin and Vir, Praveen and Shekhar, Chandra and Felser, Claudia and Facio, Jorge I. and van den Brink, Jeroen and Nielsch, Kornelius and Thomas, Andy and Goennenwein, Sebastian T. B.}
}
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