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Synthesis, structure, magnetic and half-metallic properties of Co2- Ru MnSi (x = 0, 0.25, 0.5, 0.75, 1) compounds
H P Zhang1,2, W B Liu2, X F Dai2
1State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, People's Republic of China.
Abstract:
A series of Co2- Ru MnSi (x = 0, 0.25, 0.5, 0.75, 1) Heusler compounds were successfully synthesized. The heat-treatment conditions were crucial to make the materials form a single phase with a Heusler structure. With increasing Ru content, the half-metallic gap, lattice parameters and magnetization are continuously adjustable in a wide range. The Co2- Ru MnSi (x = 0, 0.25) compounds are rigorous half-metals and show a T 3 dependence of resistance at low temperature. The Co2- Ru MnSi (x = 0.5, 0.75, 1) Heusler compounds are the nearly half-metallic materials and show a semiconductive dependence of resistance at low temperature. The experimental magnetization is consistent with that in theory and follows the Slater-Pauling rule. The Curie temperature is higher than 750 K for all Co2- Ru MnSi Heusler compounds.
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