Superconductivity and magnetic order in the noncentrosymmetric half-Heusler compound ErPdBi

We report superconductivity at T_c = 1.22\ \text{K} and magnetic order at T_N = 1.06\ \text{K} in the semimetallic noncentrosymmetric half-Heusler compound ErPdBi. The upper critical field, B_c2, has an unusual quasi-linear temperature variation and reaches a value of 1.6 T for T \rightarrow 0 . Magnetic order is found below T_c and is suppressed at B{_M} \sim 2.5\ \text{T} for T \rightarrow 0 . Since T_c \simeq T_N , the interaction of superconductivity and magnetism is expected to give rise to a complex ground state. Moreover, electronic-structure calculations show that ErPdBi has a topologically nontrivial band inversion and thus may serve as a new platform to study the interplay of topological states, superconductivity and magnetic order.