Strong spin depolarization in the ferromagnetic Weyl semimetal Co3Sn2S2 : Role of spin-orbit coupling

${\mathrm{Co}}₃{\mathrm{Sn}}₂{\mathrm{S}}₂$ has recently emerged as a ferromagnetic Weyl semimetal. Theoretical investigation of the spin-split bands predicted half metallicity in the compound. Here, we report the detection of a spin-polarized supercurrent through a $\mathrm{Nb}/{\mathrm{Co}}₃{\mathrm{Sn}}₂{\mathrm{S}}₂$ point contact where Andreev reflection is seen to be large, indicating a large deviation from half metallicity. In fact, analysis of the Andreev reflection spectra reveals very small spin polarization at different points with the degree of spin polarization ranging from 20% to 50% at the Fermi level of ${\mathrm{Co}}₃{\mathrm{Sn}}₂{\mathrm{S}}₂$. Our theoretical calculations of electronic density of states reveal a spin-depolarizing effect near the Fermi energy when the role of spin-orbit coupling is included. The inclusion of spin-orbit coupling also reveals particle-hole asymmetry that explains a large asymmetry observed in our experimental Andreev reflection spectra.