Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 12: Spincaloric transport

MA 12.1: Vortrag

Montag, 1. April 2019, 17:15–17:30, H53

Magneto-thermoelectronic properties of Weyl semimetal Co2MnGa thin films — •H. Reichlova1, R. Schlitz1, S. Beckert1, P. Swekis1,2, A. Markou2, Y. C. Cheng2, D. Kriegner2, S. Fabretti1, G. H. Park3,4, A. Niemann3, S. Sudheendra3, A. Thomas3, K. Nielsch3,4, C. Felser2, and S. Goennenwein11Institut für Festkörper- und Materialphysik, Technische Universität Dresden, Germany — 2MPI CPfS, Dresden, Germany — 3IFW Dresden, Institute for Metallic Materials, Germany — 4Technische Universität Dresden, Institute of Materials Science, Germany

The non-trivial topology of the band structure of Weyl semimetals leads to unexpected magneto-thermoelectronic transport phenomena. A promising Weyl semimetal is the ferromagnetic Heusler compound Co2MnGa with the Fermi energy in the vicinity of the Weyl nodes. Here we report the observation of a record large anomalous Nernst coefficent -2µV/K in Co2MnGa thin films [1]. We will discuss the procedure for the quantitative determination of the thermal gradient and address potential artifacts potentially impacting the anomalous Nernst coefficient. Comparing the magnitude of the anomalous Nernst coefficient in Co2MnGa films of different thickness, we conclude that the microscopic origin of the anomalous Nernst effect in Co2MnGa is complex and contains contributions from the intrinsic Berry phase and surface states. [1] Reichlova et al., APL 113, 212405 (2018)

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