Nontrivial Topological Properties and Synthesis of SnCoS with L2 Structure.

We synthesize SnCoS in experiment and study its topological properties in theory. By first-principles calculations, we study the band structure and surface state of SnCoS with L2 structure. It is found that the material has type-II nodal line in the Brillouin zone and clear drumhead-like surface state when the spin-orbit coupling is not considered.