ThCr2Si2C: An Antiferromagnetic Metal with a Cr2C Square Lattice
Yusen Xiao1,2, Baizhuo Li1, Qingchen Duan1
1School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, P. R. China.
Abstract:
A quaternary compound, ThCr2Si2C, was synthesized by using the arc-melting technique. The compound adopts a tetragonal CeCr2Si2C-type crystal structure. The electronic resistivity and specific heat data exhibit metallic behavior, while the magnetic susceptibility displays a pronounced broad peak at around 370 K, indicating the antiferromagnetic phase transition. The first-principles calculations suggest A-type antiferromagnetic ordering of the Cr sublattice, which is confirmed by neutron diffraction experiments. By comparing the crystal structure of ThCr2Si2C with the isostructural Cr-based compounds, the magnetic state of Cr 3d orbital is discussed in terms of the band-filling effects and indirect spin exchange interaction.
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