Magnetic and superconducting phase diagram of the half-Heusler RPtBi topological semimetals (R=rare earth)

The half-Heusler RTBi (R=rare earth, T=transition metal) compounds have attracted much attention because of their topologically non-trivial band structure, which can host various topological phases. Whereas the RPdBi family has been extensively studied, where the topological crossover is driven by the atomic mass of the rare earth element, the RPtBi family has not been much investigated, although most of them are theoretically predicted to be topological semimetals. All RPtBi members are also expected to undergo magnetic or/and superconducting transitions, which would provide crucial information about the interplay among band structure, magnetism, and superconductivity. In this work, we synthesize previously overlooked RPtBi compounds and investigate low-temperature transport, magnetic, and thermodynamic properties to shed light on the topological properties of this family. We also verify that the magnetic and superconducting ground states in RPtBi are tuned by the de Gennes factor, which was proposed for a sister family, RPdBi.