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Co$_3$Sn$_2$S$_2$ has recently emerged as a ferromagnetic Weyl semi-metal.Theoretical investigation of the spin-split bands predicted half metalicity inthe compound. Here, we report the detection of a spin polarized supercurrentthrough a Nb/Co$_3$Sn$_2$S$_2$ point contact where Andreev reflection is seento be large indicating a large deviation from half metallicity. In fact,analysis of the Andreev reflection spectra reveals only 50\% spin polarizationat the Fermi level of Co$_3$Sn$_2$S$_2$. Our theoretical calculations ofelectronic Density of States (DOS) reveal a spin depolarizing effect near theFermi energy when the role of spin-orbit coupling is included. Inclusion ofspin-orbit coupling also reveals particle-hole asymmetry that explains a largeasymmetry observed in our experimental Andreev reflection spectra.

Spin-orbit driven spin depolarization in the ferromagnetic Weyl semimetal Co3Sn2S2