  Superconducting and topological states are two distinct quantum states of
matter. Superconductors with topologically nontrivial electronic states provide
a platform to study the interplay between them. Recent study revealed that a
bulk superconductor PdTe2 is a topological Dirac semimetal with type-II Dirac
fermions. However, the Dirac fermions in PdTe2 have no contribution to the
superconducting pair because the Dirac points reside far below the Fermi level
(EF). Here, we show that in the isostructural compounds (Ir1-xPtx)Te2, the
type-II Dirac points can be adjusted to EF by element substitution at x ~ 0.1,
for which the bulk superconductivity appears near 2 K. The (Ir1-xPtx)Te2
superconductor with the Dirac points at EF paves the way for studying the
relevant exotic physical phenomena such as topological superconductivity in
Dirac semimetals.

Materials Science;Mesoscale and Nanoscale Physics