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Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 42: Magnetic Heuslers, Half-Metals and Oxides (jointly with TT)

MA 42.8: Vortrag

Donnerstag, 10. März 2016, 11:30–11:45, H34

Contributions from conduction electrons and localized moments to the magnetization in Cu2MnAl as separated by spin polarized measurements — •Josef Andreas Weber1, Andreas Bauer1, Peter Böni1, Hubert Ceeh1, Stephen Dugdale2, Atsuo Kawasuso4, Michael Leitner3, Christian Pfleiderer1, and Christoph Hugenschmidt1,31Physik-Department, Technische Universität München, James-Franck Straße, 85748 Garching, Germany — 2H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, UK — 3Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstraße 1, 85748 Garching, Germany — 4Advanced Science Research Center, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan

The distinction between localized and itinerant ferromagnetism is for some systems still a contentious issue. In Mn based Heusler systems it is usually assumed, that all the magnetic moments are localized at the Mn atoms. However it was shown, that in Cu2MnAl there exist different Fermi surfaces for the majority and minority spin channel and therefore also the conduction electrons contribute substantially to the the total magnetic moment [1]. Here we report our results obtained by comparing spin polarized 2D-ACAR measurements with recent magnetic Compton scattering measurements and with spin polarized positron lifetime experiments.

[1] J. A. Weber et al., Phys. Rev. Lett. 115 206404 (2015).

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