Co3Sn2S2 has recently emerged as a ferromagnetic Weyl semi-metal. Theoretical investigation of the spin-split bands predicted half metalicity in the compound. Here, we report the detection of a spin polarized supercurrent through a Nb/Co3Sn2S2 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 only 50\% spin polarization at the Fermi level of Co3Sn2S2. Our theoretical calculations of electronic Density of States (DOS) reveal a spin depolarizing effect near the Fermi energy when the role of spin-orbit coupling is included. Inclusion of spin-orbit coupling also reveals particle-hole asymmetry that explains a large asymmetry observed in our experimental Andreev reflection spectra.
@article{arxiv.1906.06557,
title = {Spin-orbit driven spin depolarization in the ferromagnetic Weyl semimetal Co3Sn2S2},
author = {Sandeep Howlader and Surabhi Saha and Ritesh Kumar and Vipin Nagpal and Satyabrata Patnaik and Tanmoy Das and Goutam Sheet},
journal= {arXiv preprint arXiv:1906.06557},
year = {2020}
}