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  Kumar, V.; Reehuis, M.; Hoser, A.; Adler, P.; Felser, C.: Crystal and magnetic structure o antiferromagnetic Mn₂PtPd. Journal of Physics: Condensed Matter 30 (2018), p. 265803/1-6

10.1088/1361-648X/aac6fb
Open Access Version

Abstract:
We have investigated the crystal and magnetic structure of Mn2PtPd alloy using powder x-ray and neutron diffraction experiments. This compound is believed to belong to the Heusler family having crystal symmetry I4/mmm (TiAl3-type). However, in this work we found that the Pd and Pt atoms are disordered and thus Mn2PtPd crystallizes in the L10 structure having P4/mmm symmetry (CuAu-I type) like MnPt and MnPd binary alloys. The lattice constants are a = 2.86 Å and c = 3.62 Å at room temperature. Mn2PtPd has a collinear antiferromagnetic spin structure below the Néel temperature TN = 866 K, where Mn moments of ~4 μB lie in the ab-plane. We observed a strong change in the lattice parameters near TN. The sample exhibits metallic behaviour, where electrical resistivity and carrier concentration are of the order of 10−5 Ω cm and 1021 cm−3, respectively.