The magnetic structure of the topological semimetal Co${}_3$Sn${}_2$S${}_2$

Abstract

Co${}_3$Sn${}_2$S${}_2$ has recently been predicted to be a Weyl semimetal in which magnetic order is key to its behavior as a topological material. Here we report unpolarized neutron diffraction and spherical neutron polarimetry measurements, supported by magnetization and transport data, which probe the magnetic order in Co${}_3$Sn${}_2$S${}_2$ below $T_{\text{C}}=177$ K. The results are fully consistent with ferromagnetic order in which the spins on the Co atoms point along the crystal $c$ axis, although we cannot rule out some canting of the spins. We find no evidence for a type of long-ranged $(\text{k}=\text{0})$ in-plane 120${}^{\circ }$ antiferromagnetic order which had previously been considered as a secondary phase present at temperatures between $\sim$90 K and $T_{\text{C}}$. A discontinuous change in bulk properties and neutron polarization observed at $T=125$ K when samples are cooled in a field and measured on warming is found to be due to a sudden reduction in ferromagnetic domain size. Our results lend support to the theoretical predictions that Co${}_3$Sn${}_2$S${}_2$ is a magnetic Weyl semimetal.

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