Evidence of unconventional superconductivity on the surface of the nodal semimetal CaAgPdP.

Surface states of topological materials provide extreme electronic states for unconventional superconducting states. CaAgPdP is an ideal candidate for a nodal-line Dirac semimetal with drumhead surface states and no additional bulk bands. Here, we report that CaAgPdP has surface states that exhibit unconventional superconductivity (SC) around 1.