In the last few years, Mn3Sn has shown a large interest in condensed matter physics community due to the Weyl Semimetallic nature of this compound. Due to the emergent Berry flux from the Weyl points, Mn3Sn shows interesting properties like Anomalous Hall Effect, Chiral magnetic effect, and other non-local transport properties.
Along with exotic transport properties, this material shows temperature-dependent magnetic structure. To understand the connection between Weyl properties with the magnetic structure we have performed single crystal neutron diffraction of Mn3.17Sn sample at the HEiDi instrument at FRM II. Our diffraction experiment confirms that between 274 K < T < 420 K (TN) Mn moment order in an inverse triangular antiferromagnetic structure in the a-b plane. In the temperature range 50 to 274 K, Mn moments order in a spiral magnetic structure. The same spiral magnetic structure persists below 50 K down to 4 K where a spin-glass state was reported. The direct correlation between the magnetic structure and the Anomalous Hall Effect (AHE) is still unclear. As few groups claimed that in the incommensurate region (50 K to 190 K)1 no AHE was observed but other groups found AHE in this region2. We have observed AHE in the incommensurate region with amplitude compare to the published report.
1. N. H. Sung et al. Applied Physics Letter 112, 132406 (2018).
2. S. Nakatsuji et al. Nature 527, 212 (2015).