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MA: Fachverband Magnetismus
MA 15: Magnetic Heuslers, Half-metals and Oxides (jointly with TT)
MA 15.1: Vortrag
Montag, 20. März 2017, 15:00–15:15, HSZ 403
Giant anomalous Hall effect in Heusler compounds — •Kaustuv Manna1, Rolf Stinshoff1, Ting-Hui Kao1, Nitesh Kumar1, Chandra Shekhar1, Jayita Nayak1, Sunil Wilfred DSouza1, Sanjay Singh1, Gerhard H. Fecher1, Stuart S. P. Parkin2, and Claudia Felser1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany
The Co-Based Heusler compounds have drawn considerable interest in last few years for the spintronics application due to the prediction of large anomalous Hall effect (AHE) as well as spin Hall effect [1]. For many of the samples like Co2MnAl, Co2MnGa etc. formation of the Weyl points near Fermi energy was proposed to be the origin for such fascinating behaviour [2]. Here we report the giant anomalous Hall effect in Co2MnGa single crystals. The sample crystallizes with Fm3m which hold the inversion symmetry and the AHE observed 1200 S cm−1 at 2 K. The ferromagnetic moment found 4.23 µB/fu. On the contrary, for the systems where the inversion symmetry is broken, like Mn2CoGa [F43m], there is no Weyl point in the band structure. Interestingly we don’t observe any AHE at 2 K though the system possess ferromagnetic moment of 2.27 µB/fu.
[1]Jen-Chuan Tung and Guang-Yu Guo, New J. Phys. 15, 033014 (2013).
[2]J. Kubler and C. Felser, Europhys. Lett. 114, 47005 (2016).