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MA: Fachverband Magnetismus
MA 14: Poster Ib: Magnetic Materials (1-14); Micro Magnetism/Computational Mag. (15-17); Surface Magnetism (18-22); Spin Structures/Phase Transitions (23-25)
MA 14.9: Poster
Tuesday, March 24, 2009, 10:15–13:00, P1B
Rh2MnGe: a Heusler compound with 4d valence electrons. — •Lubna Basit, Jan Thoene, Stanislav Chadov, Gerhard H. Fecher, and Claudia Felser — Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg - University, 55099 Mainz
We report on the structural and magnetic properties of Rh2MnGe Heusler alloy. Polycrystalline samples of Rh2MnGe have been prepared and the bulk properties were charaterized by bulk techniques (X-ray diffraction and magnetization). Rh2MnGe is L21 ordered. The magnetic properties of Rh2MnGe were measured by means of SQUID magnetometry. Rh2MnGe is a candidate for ferromagnetic alloys with a saturation moment of 3.6 µB in the primitive cell at 5 K. The magnetic moments are considerably more localized for Rh2MnGe in comparison to the isoelectronic compound Co2MnGe. In spite of the localization of the Mn moment, the Heisenberg model fails to describe the temperature dependence correctly, which might be due to the remaining itinerant character of the Rh moment. In addition, we have studied the electronic properties of Rh2MnGe by ab-initio calculations using the fully-relativistic spin-polarized Korringa-Kohn-Rostoker (SPR-KKR) Green’s function method. Computational results agree with experiment by predicting this compound as metallic with the low degree of the spin-polarization. However the calculated magnetic moment (4 µB) obeys the Slater-Pauling rule closely. The authors gratefully acknowledge financial support by the DfG (Research Unit 559).