Coupling of magnetic order to planar Bi electrons in the anisotropic Dirac metals AMnBi(2) (A = Sr, Ca)

@article{Guo2014CouplingOM,
  title={Coupling of magnetic order to planar Bi electrons in the anisotropic Dirac metals AMnBi(2) (A = Sr, Ca)},
  author={Y. F. Guo and Andrew J. Princep and X. Zhang and Pascal Manuel and Dimitry D. Khalyavin and Igor I. Mazin and Y. G. Shi and Andrew T. Boothroyd},
  journal={Physical Review B},
  year={2014},
  volume={90},
  pages={075120}
}
We report powder and single-crystal neutron diffraction measurements of the magnetic order in $A{\mathrm{MnBi}}_{2}$ ($A=\mathrm{Sr}$ and Ca), two layered manganese pnictides with anisotropic Dirac fermions on a Bi square net. Both materials are found to order at ${T}_{\mathrm{N}}\ensuremath{\approx}300$ K in $\mathbf{k}=0$ antiferromagnetic structures, with ordered Mn moments at $T=10$ K of approximately $3.8 {\ensuremath{\mu}}_{\mathrm{B}}$ aligned along the $c$ axis. The magnetic structures… 

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