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Thickness dependence of the anomalous Nernst effect and the Mott relation of Weyl-semimetal Co2MnGa thin films

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2019

Autor:innen

Park, Gyu-Hyeon
Reichlova, Helena
Schlitz, Richard
Markou, Anastasios
Swekis, Peter
Ritzinger, Philipp
Kriegner, Dominik
Thomas, Andy
et al.

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http://nbn-resolving.de/urn:nbn:de:bsz:352-2-17ra2t5jl82l73
DOI (zitierfähiger Link)
https://doi.org/10.1103/PhysRevB.101.060406
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http://arxiv.org/abs/1909.10168v2

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CC BY 4.0

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Physik: Publikationen
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Published

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Physical Review B. American Physical Society (APS). 2019, 101(6), 060406(R). ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.101.060406

Zusammenfassung

We report a robust anomalous Nernst effect in Co2MnGa thin films in the thickness regime between 20 and 50 nm. The anomalous Nernst coefficient varied in the range of -2.0 to -3.0 uV/K at 300 K. We demonstrate that the anomalous Hall and Nernst coefficients exhibit similar behavior and fulfill the Mott relation. We simultaneously measure all four transport coefficients of the longitudinal resistivity, transversal resistivity, Seebeck coefficient, and anomalous Nernst coefficient. We connect the values of the measured and calculated Nernst conductivity by using the remaining three magneto-thermal transport coefficients, where the Mott relation is still valid. The intrinsic Berry curvature dominates the transport due to the relation between the longitudinal and transversal transport. Therefore, we conclude that the Mott relationship is applicable to describe the magneto-thermoelectric transport in Weyl semimetal Co2MnGa as a function of film thickness.

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530 Physik

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ISO 690PARK, Gyu-Hyeon, Helena REICHLOVA, Richard SCHLITZ, Michaela LAMMEL, Anastasios MARKOU, Peter SWEKIS, Philipp RITZINGER, Dominik KRIEGNER, Sebastian T. B. GOENNENWEIN, Andy THOMAS, 2019. Thickness dependence of the anomalous Nernst effect and the Mott relation of Weyl-semimetal Co2MnGa thin films. In: Physical Review B. American Physical Society (APS). 2019, 101(6), 060406(R). ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.101.060406
BibTex
@article{Park2019-09-23T05:49:59ZThick-52283,
  year={2019},
  doi={10.1103/PhysRevB.101.060406},
  title={Thickness dependence of the anomalous Nernst effect and the Mott relation of Weyl-semimetal Co<sub>2</sub>MnGa thin films},
  number={6},
  volume={101},
  issn={2469-9950},
  journal={Physical Review B},
  author={Park, Gyu-Hyeon and Reichlova, Helena and Schlitz, Richard and Lammel, Michaela and Markou, Anastasios and Swekis, Peter and Ritzinger, Philipp and Kriegner, Dominik and Goennenwein, Sebastian T. B. and Thomas, Andy},
  note={Article Number: 060406(R)}
}
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    <dcterms:abstract xml:lang="eng">We report a robust anomalous Nernst effect in Co&lt;sub&gt;2&lt;/sub&gt;MnGa thin films in the thickness regime between 20 and 50 nm. The anomalous Nernst coefficient varied in the range of -2.0 to -3.0 uV/K at 300 K. We demonstrate that the anomalous Hall and Nernst coefficients exhibit similar behavior and fulfill the Mott relation. We simultaneously measure all four transport coefficients of the longitudinal resistivity, transversal resistivity, Seebeck coefficient, and anomalous Nernst coefficient. We connect the values of the measured and calculated Nernst conductivity by using the remaining three magneto-thermal transport coefficients, where the Mott relation is still valid. The intrinsic Berry curvature dominates the transport due to the relation between the longitudinal and transversal transport. Therefore, we conclude that the Mott relationship is applicable to describe the magneto-thermoelectric transport in Weyl semimetal Co&lt;sub&gt;2&lt;/sub&gt;MnGa as a function of film thickness.</dcterms:abstract>
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