Crystal and magnetic structure of antiferromagnetic Mn2PtPd. (8th June 2018)

• Record Type: Journal Article
• Authors: Kumar, Vivek; Reehuis, Manfred; Hoser, Andreas; Adler, Peter; Felser, Claudia
• Is Part Of: Journal of physics. Volume 30:Number 26(2018)
• Publication Date: 2018-06-08
• Subjects: Heusler alloys -- antiferromagnetism -- neutron diffraction -- Hall resistance -- crystal structure -- intermetallic phases; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/aac6fb
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: We have investigated the crystal and magnetic structure of Mn2 PtPd alloy using powder x-ray and neutron diffraction experiments. This compound is believed to belong to the Heusler family having crystal symmetry I 4/ mmm (TiAl3 -type). However, in this work we found that the Pd and Pt atoms are disordered and thus Mn2 PtPd crystallizes in the L 10 structure having P 4/ 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. Mn2 PtPd 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 10 21 cm −3, respectively.