Shubnikov-de Haas oscillations in the ferromagnetic Weyl semimetal Co₃Sn₂S₂

We report the observation of Shubnikov-de Haas oscillations in high quality single crystals of the ferromagnetic Weyl semimetal Co₃Sn₂S₂ up to 45 T. The Fermi surfaces resolved in our experiments are three-dimensional and reflect an underlying trigonal crystallographic symmetry. Combined with density functional theoretical calculations, we identify that the majority of the Fermi surfaces in the system -- of both electron and hole nature -- arise from the strong energy dispersion of the mirror-protected nodal loops prior to the inclusion of spin-orbit coupling. We discuss the dependence of the Fermi surface on the ferromagnetic moment orientation. We anticipate our results to shed light on the interplay between the ferromagnetic order and topological electronic states in Co₃Sn₂S₂.