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Two-orbital effective model for magnetic Weyl semimetal in Kagome-lattice shandite

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arxiv 1904.08148 v1 pith:ATWGJNOQ submitted 2019-04-17 cond-mat.mes-hall cond-mat.mtrl-sci

Two-orbital effective model for magnetic Weyl semimetal in Kagome-lattice shandite

classification cond-mat.mes-hall cond-mat.mtrl-sci
keywords magneticmodelshanditeweyleffectivekagome-latticeorbitalpoints
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We construct a two-orbital effective model for a ferromagnetic Kagome-lattice shandite, $\rm{{Co}_3{Sn}_2{S}_2}$, a candidate material of magnetic Weyl semimetals, by considering one $d$ orbital from Co, and one $p$ orbital from interlayer Sn. The energy spectrum near the Fermi level, and the configurations of the Weyl points, computed by using our model, are similar to those obtained by first principle calculations. We show also that nodal rings appear even with spin-orbit coupling when the magnetization points in-plane direction. Additionally, magnetic properties of $\rm{{Co}_3{Sn}_2{S}_2}$ and other shandite materials are discussed.

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