Superconductivity in the nodal-line compound La_{3}Pt_{3}Bi_{4}

Abstract

Owing to the specific topological states in nodal-line semimetals, novel topological superconductivity is expected to emerge in these systems. In this Letter, we demonstrate that La_{3}Pt_{3}Bi_{4} is a topologically nontrivial nodal-ring semimetal protected by the gliding-mirror symmetry using first-principles calculations. Meanwhile, we discover bulk superconductivity with a transition temperature of ∼1.1 K and an upper critical field of ∼0.41 T by means of resistivity, susceptibility, and specific heat measurements. These findings demonstrate that La_{3}Pt_{3}Bi_{4} provides a material platform for studying novel superconductivity in the nodal-ring system.