Topological Kagome magnet Co3Sn2S2 thin flakes with high electron mobility and large anomalous Hall effect

TL;DR

This paper reports the synthesis of high-quality Co3Sn2S2 thin flakes with high electron mobility and large anomalous Hall effect, advancing the study of magnetic Weyl semimetals in two-dimensional materials.

Contribution

It demonstrates a simple method to produce large, high-quality Co3Sn2S2 thin flakes with record electron mobility and significant topological transport properties.

Findings

Largest electron mobility (~2,600 cm2V-1s-1) among magnetic topological semimetals

Large anomalous Hall conductivity (~1,400 Ω-1cm-1)

Anomalous Hall angle (~32 %) from Berry curvature

Abstract

Magnetic Weyl semimetals attract considerable interest not only for their topological quantum phenomena but also as an emerging materials class for realizing quantum anomalous Hall effect in the two-dimensional limit. A shandite compound Co3Sn2S2 with layered Kagome-lattices is one such material, where vigorous efforts have been devoted to synthesize the two-dimensional crystal. Here we report a synthesis of Co3Sn2S2 thin flakes with a thickness of 250 nm by chemical vapor transport method. We find that this facile bottom-up approach allows the formation of large-sized Co3Sn2S2 thin flakes of high-quality, where we identify the largest electron mobility (~2,600 cm2V-1s-1) among magnetic topological semimetals, as well as the large anomalous Hall conductivity (~1,400 {\Omega}-1cm-1) and anomalous Hall angle (~32 %) arising from the Berry curvature. Our study provides a viable platform for studying high-quality thin flakes of magnetic Weyl semimetal and stimulate further research on unexplored topological phenomena in the two-dimensional limit.