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

Abstract

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 in the compound. Here, we report the detection of a spin polarized supercurrent through a Nb/Co${}_3$Sn${}_2$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 only 50\% spin polarization at the Fermi level of Co${}_3$Sn${}_2$S${}_2$. 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.

arXiv commentSupplemental not included

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• Spin-polarized supercurrent through the van der Waals Kondo lattice ferromagnet Fe${}_3$GeTe${}_2$
• Field Orientation Dependent Magnetic Phases In Weyl Semimetal Co3Sn2S2