Superconductivity and magnetic order in the non-centrosymmetric Half Heusler compound ErPdBi

Abstract

We report superconductivity at $T_c=1.22$ K and magnetic order at $T_N=1.06$ K in the semi-metallic 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 $T\to 0$. Magnetic order is found below $T_c$ and is suppressed at $B{}_M\sim 2.5$ T for $T\to 0$. 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 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.

6 pages, 5 figures; accepted for publication in Europhysics Letters

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