Abstract
Recently, the antiferromagnet YbMnSb${}_{2}$ has been predicted to be a topological semimetal driven by time-reversal symmetry breaking, where the magnetic order is key to its behavior as a topological material. Depending on the magnetic order, YbMnSb${}_{2}$ can have Weyl, nodal-line, or Dirac topological features. In this Letter, the authors use a combination of unpolarized and polarized neutron diffraction to determine unambiguously the magnetic structure of YbMnSb${}_{2}$ and the topology of the electronic bands.
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