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Thickness dependence of the anomalous Nernst effect and the Mott relation of Weyl-semimetal Co<sub>2</sub>MnGa thin films

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

Type of Publication: Journal article
Publication status: Published
URI (citable link): http://nbn-resolving.de/urn:nbn:de:bsz:352-2-17ra2t5jl82l73
Author: Park, Gyu-Hyeon; Reichlova, Helena; Schlitz, Richard; Lammel, Michaela; Markou, Anastasios; Swekis, Peter; Ritzinger, Philipp; Kriegner, Dominik; Gönnenwein, Sebastian T. B.; Thomas, Andy et al.
Year of publication: 2019
Published in: Physical Review B ; 101 (2019), 6. - 060406(R). - American Physical Society (APS). - ISSN 2469-9950. - eISSN 2469-9969
ArXiv-ID: arXiv:1909.10168v2
DOI (citable link): https://dx.doi.org/10.1103/PhysRevB.101.060406
Summary:
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.
Subject (DDC): 530 Physics
Link to License: Attribution 4.0 International
Refereed: Yes

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PARK, Gyu-Hyeon, Helena REICHLOVA, Richard SCHLITZ, Michaela LAMMEL, Anastasios MARKOU, Peter SWEKIS, Philipp RITZINGER, Dominik KRIEGNER, Sebastian T. B. GÖNNENWEIN, 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). 101(6), 060406(R). ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.101.060406

@article{Park2019-09-23T05:49:59ZThick-52283, title={Thickness dependence of the anomalous Nernst effect and the Mott relation of Weyl-semimetal Co2MnGa thin films}, year={2019}, doi={10.1103/PhysRevB.101.060406}, 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 Gönnenwein, Sebastian T. B. and Thomas, Andy}, note={Article Number: 060406(R)} }

2021-01-05T10:08:25Z Schlitz, Richard eng Lammel, Michaela Thickness dependence of the anomalous Nernst effect and the Mott relation of Weyl-semimetal Co<sub>2</sub>MnGa thin films Park, Gyu-Hyeon Swekis, Peter Gönnenwein, Sebastian T. B. 2021-01-05T10:08:25Z Markou, Anastasios Thomas, Andy We report a robust anomalous Nernst effect in Co<sub>2</sub>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<sub>2</sub>MnGa as a function of film thickness. Reichlova, Helena Kriegner, Dominik Thomas, Andy Ritzinger, Philipp Attribution 4.0 International Park, Gyu-Hyeon 2019-09-23T05:49:59Z Markou, Anastasios Reichlova, Helena Gönnenwein, Sebastian T. B. Schlitz, Richard Ritzinger, Philipp Lammel, Michaela Kriegner, Dominik Swekis, Peter

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