Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Magnetism Poster A
MA 15.69: Poster
Dienstag, 2. April 2019, 10:00–13:00, Poster E
Spin-resolved ACAR measurements of Co2MnGa — •Josef Ketels1, Michael Leitner2, Kaustuv Manna3, Rolf Stinshoff3, Claudia Felser3, and Christoph Hugenschmidt1,2 — 1Physik Department E21, Technische Universität München, Garching, Germany — 2Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany — 3Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany
The ferromagnetic compound Co2MnGa crystallizes in the full Heusler L21 structure. This material is expected to be a half-semimetal due to a small Fermi surface in the minority spin channel. The spin polarization was experimentally determined to be close to 4.0 µB/formula unit [1]. Furthermore this Heusler compound was one of the first materials to show the anomalous Nernst effect beyond the magnetization scaling relation due to the large net Berry curvature close to the Fermi energy originating from Weyl points and nodal lines [2]. The measurement of the angular correlation of positron annihilation radiation (ACAR) is a very powerful tool to investigate the bulk electronic structure. Based on the spin polarization of the positrons from a Na22 source, the minority and majority spin-channels can be determined separately. Here we present the first spin-resolved ACAR experiments showing the anisotropy of the Fermi surface of Co2MnGa.
[1] Kolbe, M. et al., Phys. Rev. B 86, 024422 (2012)
[2] Guin, S.N. et al., arXiv:1806.06753 [cond-mat.mtrl-sci], (2018)