Itinerant G-type antiferromagnetic order in SrCr${}_2$As${}_2$

Abstract

Neutron diffraction and magnetic susceptibility studies of a polycrystalline SrCr${}_2$As${}_2$ sample reveal that this compound is an itinerant G-type antiferromagnet below the N$\acute{\mathrm{e}}$el temperature $T_{\text{N}}$ = 590(5) K with the Cr magnetic moments aligned along the tetragonal $c$ axis. The system remains tetragonal to the lowest measured temperature ($\sim$12 K). The lattice parameter ratio $c/a$ and the magnetic moment saturate at about the same temperature below $\sim$ 200 K, indicating a possible magnetoelastic coupling. The ordered moment, $\mu =1.9(1){\mu }_{\mathrm{B}}$/Cr, measured at $T=12$ K, is significantly reduced compared to its localized value ($4{\mu }_{\mathrm{B}}$/Cr) due to the itinerant character brought about by the hybridization between the Cr $3d$ and As $4p$ orbitals.

6 pages, 5 figures

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