Superconductivity and Magnetic Order in half-Heusler series Y_1-xYb_xPtBi

The noncentrosymmetric Half Heusler series RPtBi (R = rare earth) hosts a range of exotic phases, including unconventional superconductivity, nontrivial topological band structures, and magnetic order. Notably, YPtBi exhibits superconductivity below T_c = 0.8 K with an unusually high critical field (H_c2 = 1.5 T), while YbPtBi demonstrates heavy fermion behavior and undergoes an antiferromagnetic transition at T_N = 0.44 K. Additionally, YPtBi is a low-carrier semimetal (n ≈ 2 ×10¹⁸ cm^-3) with evidence of j = 3/2 electronic states. To investigate the interplay between magnetism, strong correlations, and superconductivity, we present a study of the single-crystal solid solution series Y_1-xYb_xPtBi, reporting transport, magnetic susceptibility and heat capacity measurements aimed at studying the evolution of properties from light- to heavy-fermion end members.