上海科技大学知识管理系统

Magnetic topological insulators and semimetals have become an import branch in the study of topological materials. Topological materials with intrinsic magnetism are superior for better quality and performances. Here we report a scanning tunneling microscopic study of CrIr2Sn10, a newly synthesized material as a candidate for magnetic topological semimetal. Sn and Cr surface terminations are identified with distinctive spectroscopic characters. Charge localization is signified by the density of states peak near -200 meV that is consistent with the flat band dispersion in density functional theory calculations. The electron correlations are further evidenced by the particle-hole asymmetry in the background of differential conductance spectrum. The inserting of Cr layers not only introduces ferromagnetism in the material, but also breaks the local inversion symmetry of Sn-Ir-Sn unit structure compared with IrSn4. The spin-orbit coupling thus induced/enhanced is essential to the band topologies. Our findings suggest that CrIr2Sn10 could be an ideal platform for exploring the symmetry-protected topological phases as well as their interplay with electron correlation and magnetism.