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

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arxiv 1906.06557 v1 pith:TBQMRVVY submitted 2019-06-15 cond-mat.supr-con cond-mat.mes-hall

Sandeep Howlader , Surabhi Saha , Ritesh Kumar , Vipin Nagpal , Satyabrata Patnaik , Tanmoy Das , Goutam Sheet This is my paper · ORCID
classification cond-mat.supr-concond-mat.mes-hall
keywords spinandreevlargereflectionspin-orbitasymmetrycouplingfermi
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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.

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  1. Electronic correlations and flattened band in magnetic Weyl semimetal candidate Co3Sn2S2

    cond-mat.mtrl-sci 2019-08 conditional novelty 6.0 of 10

    Optical spectroscopy and DFT+DMFT show intermediate electron correlations (U≈4 eV) in Co3Sn2S2 and reveal a correlation-flattened band connecting its Weyl cones, supporting the persistence of its Weyl semimetal state.

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