Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetic Shape Memory Alloys (Joint Session with MM)

MA 51.2: Vortrag

Freitag, 20. März 2015, 09:45–10:00, H 0112

Spin polarized Fermi surface and conduction electron polarization in the Heusler Cu₂MnAl meausred with 2D ACAR — •Josef Andreas Weber¹, Andreas Bauer¹, Peter Böni¹, Hubert Ceeh¹, Stephen Dugdale², Michael Leitner³, Christian Pfleiderer¹, and Christoph Hugenschmidt^1,3 — ¹Technische Universität München, Physik Department, Lehrstuhl E21/E51, James-Franck-Straße, D-85748 Garching, Germany — ²H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK — ³Technische Universität München, Forschungs-Neutronenquelle Heinz Maier-Leibnitz, Lichtenbergstraße 1, D-85748 Garching, Germany

Although a conceptual understanding for the so-called Heusler systems exists, the nature of the electronic interactions is known to be rather delicate. Especially if it is required to tailor special features, a deep insight into these interactions is necessary. We want to contribute to the knowledge about this class of materials by the investigation of the prototypical Heusler alloy Cu₂MnAl with the two Dimensional Angular Correlation of positron electron Annihilation Radiation (2D-ACAR) technique. In order to extract the spin polarized Fermi surface, a refined reconstruction method is introduced. Furthermore, a comparison of the measurements with ab-initio calculations additionally to a procedure to extract the sign of the conduction electron polarization is presented.