From Laboratory Press to Spins with Giant Effects

Parallelly aligned spins in Co-Kagome nets have provided several reasons for researchers to celebrate: Liu et al. and Wang et al. have reported discoveries of unique combinations of properties: Sn₂ Co₃ S₂ =Co₃ Sn₂ S₂ =SnCo_3/2 S exhibits giant anomalous Hall effects that exceed those of known materials by orders of magnitude. For this laboratory curiosity, a specific electronic topology has been discovered in the predicted half-metal ferromagnetic S= $$ state that makes it a fascinating example of the novel group of magnetic Weyl semimetals. We present a chemical view on this compound that was little understood for a long time, but that is now also studied with respect to skyrmion lattices and thermoelectrics.