Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 51: Magnetic Shape Memory Alloys (Joint Session with MM)
MA 51.2: Talk
Friday, March 20, 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 Hugenschmidt1,3 — 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.