Dresden 2009 – wissenschaftliches Programm

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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

Dienstag, 24. März 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 µ_B 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 µ_B) obeys the Slater-Pauling rule closely. The authors gratefully acknowledge financial support by the DfG (Research Unit 559).