First-principles investigation of magnetic and transport properties in hole-doped shandite compounds Co${}_3$In${}_x$Sn${}_{2-x}$S${}_2$

Abstract

Co-based shandite Co${}_3$Sn${}_2$S${}_2$ is a representative example of magnetic Weyl semimetals showing rich transport phenomena. We thoroughly investigate magnetic and transport properties of hole-doped shandites Co${}_3$In${}_x$Sn${}_{2-x}$S${}_2$ by first-principles calculations. The calculations reproduce nonlinear reduction of anomalous Hall conductivity with doping In for Co${}_3$Sn${}_2$S${}_2$, as reported in experiments, against the linearly decreased ferromagnetic moment within virtual crystal approximation. We show that a drastic change in the band parity character of Fermi surfaces, attributed to the nodal rings lifted energetically with In-doping, leads to strong enhancement of anomalous Nernst conductivity with reversing its sign in Co${}_3$In${}_x$Sn${}_{2-x}$S${}_2$.

arXiv comment7 pages, 4 figures

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