Magnetic order in GdBiPt studied by x-ray resonant magnetic scattering
  Rare earth (R) half-Heusler compounds, RBiPt, exhibit a wide spectrum of novel ground states. Recently, GdBiPt has been proposed as a potential antiferromagnetic topological insulator (AFTI). We have employed x-ray resonant magnetic scattering to elucidate the microscopic details of the magnetic structure in GdBiPt below T_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 AFTI, where both time-reversal symmetry and lattice translational symmetry are broken, but their product is conserved. 
A. Kreyssig, M. G. Kim, J. W. Kim, S. M. Sauerbrei, S. D. March, G. R.   Tesdall, S. L. Bud'ko, P. C. Canfield, R. J. McQuee...
cond-mat.str-el cond-mat.mtrl-sci