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The triangular lattice antiferromagnet (TLAF) has been the standard paradigmof frustrated magnetism for several decades. The most common magnetic orderingin insulating TLAFs is the 120 structure. However, a new triple-Q chiralordering can emerge in metallic TLAFs, representing the short wavelength limitof magnetic skyrmion crystals. We report the metallic TLAF Co1/3TaS2 as thefirst example of tetrahedral triple-Q magnetic ordering with the associatedtopological Hall effect (non-zero {\sigma}_{xy}(H=0)). We also present atheoretical framework that describes the emergence of this magnetic groundstate, which is further supported by the electronic structure measured byangle-resolved photoemission spectroscopy. Additionally, our measurements ofthe inelastic neutron scattering cross section are consistent with thecalculated dynamical structure factor of the tetrahedral triple-Q state.

Tetrahedral triple-Q magnetic ordering and large spontaneous Hall conductivity in the metallic triangular antiferromagnet Co1/3TaS2