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Revealing the Magnetic Structure and Properties of Mn(Co,Ge)2
Simon R Larsen1, Vitalii Shtender1, Daniel Hedlund2
1Department of Chemistry─Ångström, Uppsala University, Box 538, 751 21Uppsala, Sweden.
Abstract:
The atomic and magnetic structures of Mn(Co,Ge)2 are reported herein. The system crystallizes in the space group P63/mmc as a superstructure of the MgZn2-type structure. The system exhibits two magnetic transitions with associated magnetic structures, a ferromagnetic (FM) structure around room temperature, and an incommensurate structure at lower temperatures. The FM structure, occurring between 193 and 329 K, is found to be a member of the magnetic space group P63/mm'c'. The incommensurate structure found below 193 K is helical with propagation vector k = (0 0 0.0483). Crystallographic results are corroborated by magnetic measurements and ab initio calculations.
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