Crystal and magnetic structure of antiferromagnetic Mn${}_2$PtPd

Abstract

We have investigated the crystal and magnetic structure of Mn${}_2$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$ (TiAl${}_3$-type). However, in this work we found that the Pd and Pt atoms are disordered and thus Mn${}_2$PtPd crystallizes in the $L$1${}_0$ 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. Mn${}_2$PtPd has a collinear antiferromagnetic spin structure below the Néel temperature $T$${}_N$ = 866 K, where Mn moments of $\sim$4 $\mu$${}_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}$ $\Omega$ cm and 10${}^{21}$ cm${}^{-3}$, respectively.

References in corpus (7)

• Electrical switching of an antiferromagnet
• Large anomalous Hall effect driven by non-vanishing Berry curvature in non-collinear antiferromagnetic Mn3Ge
• Heusler 4.0: Tunable Materials
• Magnetism in tetragonal manganese-rich Heusler compounds
• Room temperature tetragonal noncollinear antiferromagnet Pt${}_2$MnGa
• Antiferromagnetism in Ru2MnZ (Z=Sn, Sb, Ge, Si) full Heusler alloys: effects of magnetic frustration and chemical disorder
• Evidence for Localized Moment Picture in Mn-based Heusler Compounds

Cited by in corpus (1)

• Four-fold Anisotropic Magnetoresistance in Antiferromagnetic Epitaxial Thin Films of MnPt${}_x$Pd${}_{1-x}$