Superconductivity in compounds whose crystal structure lacks inversion symmetry are known to display intriguing properties that deviate from conventional BCS superconducting behavior. Here we report magnetization, resistivity, and heat capacity measurements on polycrystalline samples of ThCoC 2 , which has been reported to crystallize in the non-centrosymmetric CeNiC 2 prototype structure, and show clear evidence of bulk superconductivity in ThCoC 2 with a critical temperature of T c = 2.65 K. From the specific heat data we find a Sommerfeld coefficient of γ = 8.38 mJ mol −1 K −2 and a Debye temperature of D = 449 K. Interestingly the H c2 superconducting phase diagram displays positive curvature, and the specific heat at low temperature deviates from conventional exponential temperature dependence, which is suggestive of possible unconventional superconducting behavior in ThCoC 2 , similar to that seen in the isostructural and isoelectronic non-centrosymmetric superconductor LaNiC 2 .

In this work, we report superconductivity in the new ternary Ta 1−x Hf x B system. We also show clearly evidence that appropriate amounts of Hf substitution at the Ta site induce the stabilization of the orthorhombic FeB prototype structure in this system. Bulk superconductivity is confirmed by magnetization, electronic transport and specific heat measurements. The Hall signal has temperature dependence and the specific heat data at low temperature deviate from the conventional exponential temperature dependence in Ta 0.7 Hf 0.3 B. These results suggest multiband superconductivity in this compound.