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

Journal Article · Fri Jul 07 00:00:00 EDT 2017 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.96.014411 · OSTI ID:1374740

Das, Pinaki ^[1]; Sangeetha, N. S. ^[1]; Lindemann, George R. ^[1]; Heitmann, T. W. ^[2]; Kreyssig, Andreas ^[1]; Goldman, Alan I. ^[1]; McQueeney, Robert J. ^[1]; Johnston, David C. ^[1]; Vaknin, David ^[1]

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1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
2. Univ. of Missouri, Columbia, MO (United States)

Here, neutron-diffraction and magnetic susceptibility studies of polycrystalline SrCr₂As₂ reveal that this compound is an itinerant G-type antiferromagnet below the Néel temperature T_N = 590(5) K with the Cr magnetic moments aligned along the tetragonal c axis. The system remains tetragonal to the lowest measured temperature (~12 K). The lattice parameter ratio c/a and the magnetic moment saturate at about the same temperature below ~200 K, indicating a possible magnetoelastic coupling. The ordered moment μ = 1.9(1)μ_B/Cr, measured at T = 12 K, is significantly reduced compared to its localized value (4μ_B/Cr) due to the itinerant character brought about by hybridization between the Cr 3d and As 4p orbitals.

• Research Organization: Ames Lab. (AMES), Ames, IA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-07CH11358
• OSTI ID: 1374740
• Report Number(s): IS-J--9412
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 96; ISSN 2469-9950; ISSN PRBMDO
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English