Magnetic order in GdBiPt studied by x-ray resonant magnetic scattering

ORAL

Abstract

Rare earth ($R$) half-Heusler compounds, $R$BiPt, exhibit a wide spectrum of novel ground states.[1] We have employed x-ray resonant magnetic scattering to elucidate the microscopic details of the magnetic structure in GdBiPt below $T_{\textrm{N}}$ = 8.5\,K. Experiments at the Gd $L_{2}$ absorption edge show that the Gd moments order in an antiferromagnetic stacking along the cubic diagonal [1\,1\,1] direction satisfying the requirement for an antiferromagnetic topological insulator as proposed previously[2] where both time-reversal symmetry and lattice translational symmetry are broken, but their product is conserved. \\ The work at the Ames Laboratory was supported by US DOE, Office of Basic Energy Sciences, DMSE, contract DE-AC02-07CH11358. \\ \,[1] P. C. Canfield et al., J. Appl. Phys. \textbf{70}, 5800 (1991). \\ \,[2] R. S. K. Mong et al., Phys. Rev. B \textbf{81}, 245209 (2010).

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Authors

  • A. Kreyssig

    • Ames Lab and Dept. Phys. Astron., Iowa State Univ, Ames, IA 50011
    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames, IA
    • Iowa State University

  • M.G. Kim

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames, IA

  • J.W. Kim

    • Advanced Photon Source, ANL, Argonne, IL

  • S.M. Sauerbrei

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames, IA

  • S.D. March

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames, IA

  • G.R. Tesdall

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames, IA

  • S.L. Bud'ko

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames, IA

  • P.C. Canfield

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames, IA

  • R.J. McQueeney

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames, IA

  • A.I. Goldman

    • Ames Laboratory, Dept. of Physics and Astronomy, Iowa State University, Ames, IA