Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 10: Magnetic Materials
MA 10.7: Vortrag
Montag, 25. Februar 2008, 16:45–17:00, H 1028
Electronic, magnetic, and transport properties of quaternary (Cu,Ni)MnSb Heusler alloys — •Josef Kudrnovsky1, Vaclav Drchal1, Peter Weinberger2, and Patrick Bruno3 — 1Institute of Physics AS CR, Prague — 2Computational Materials Science Center, Vienna — 3Max-Planck Institut, Halle
Heusler alloy NiMnSb is ferromagnetic halfmetal while its counterpart CuMnSb is the antiferromagnet. The concentration dependence of the the total magnetic moment (resistivity) exhibits a dramatic decrease (increase) with increasing Cu-concentration starting from about 70% of Cu. On the other hand, the Curie temperature decreases monotonically with the Cu-content. We present the first-principles study of the concentration dependence of magnetic moments, Curie temperatures, and residual resistivities. Results are in a fair agreement with available experimental data. The electronic origin of the observed concentration trends will be also discussed.