We report superconductivity in epitaxial PtSb(0001) thin films grown on SrF2(111). Electrical transport measurements reveal a superconducting transition at Tc=1.72 K. The field-induced broadening of the transition and the presence of finite upper critical fields are consistent with type-II superconductivity. We determine the resistively defined upper critical fields for magnetic fields applied perpendicular and parallel to the film plane and parameterize their temperature dependence using an anisotropic Ginzburg-Landau approach. For the thickest film (d=50 nm), this yields coherence lengths of ξab≈55 nm and ξc≈14 nm. Current-voltage characteristics show sizeable critical currents, with a critical current density reaching Jc≈6e4 A/cm2 at 0.5 K. These results establish epitaxial PtSb as a superconducting thin-film platform compatible with lattice-matched heterostructures in the NiAs-type materials family.
@article{arxiv.2601.06504,
title = {Superconductivity in epitaxial PtSb(0001) thin films},
author = {C. Müller and S. P. Bommanaboyena and A. Badura and T. Uchimura and F. Husstedt and B. V. Schwarze and S. Banerjee and M. Ledinský and J. Michalicka and M. Míšek and M. Šindler and T. Helm and S. Fukami and F. Krizek and D. Kriegner},
journal= {arXiv preprint arXiv:2601.06504},
year = {2026}
}