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Crystal and magnetic structure of antiferromagnetic Mn2PtPd
Vivek Kumar1, Manfred Reehuis, Andreas Hoser
1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, D-01187 Dresden, Germany.
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 T N = 866 K, where Mn moments of ~4 µ B lie in the ab-plane. We observed a strong change in the lattice parameters near T N. 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.
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