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Coupling of magnetic order to planar Bi electrons in the anisotropic Dirac metals<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>A</mml:mi><mml:msub><mml:mi mathvariant="normal">MnBi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi> </mml:mi><mml:mo>(</mml:mo><mml:mi>A</mml:mi><mml:mi> </mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="normal">Sr</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">Ca</mml:mi><mml:mo>)</mml:mo></mml:math>
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 …