Coexistence of Topological Surface States and Superconductivity in Dirac Semimetal NiTe2

The coexistence of topological bands around the Fermi level (EF) and superconductivity provides a fundamental platform for exploring their interplay. However, few materials inherently display both properties. In this Letter, we demonstrate the coexistence of topological surface states at the EF and superconductivity in NiTe2 single crystals, a material hitherto not recognized as superconducting. Quasiparticle interference measurements performed via scanning tunneling microscopy suggest the presence of topological surface states at the EF, which is further corroborated by density functional theory simulations. Experimental evidence for superconductivity is provided via electronic transport measurements and specific heat capacity analyses. Our results suggest that NiTe2 represents a promising platform for investigating the rich interplay between topological states and superconductivity.