Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 66: Magnetic Heusler Materials, Semimetals und Oxides
(Joint session of MA and TT organized by MA)

TT 66.8: 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 Hugenschmidt^1,3 — ¹Physik-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).