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, by combination of the first-principles calculations and resistivity, susceptibility and specific heat measurements, we demonstrate that La${}_3$Pt${}_3$Bi${}_4$ is a topologically nontrivial nodal-ring semimetal protected by the gliding-mirror symmetry even in the presence of spin-orbit coupling. Meanwhile, we discover bulk superconductivity with a transition temperature of $\sim$1.1 K, and an upper critical field of $\sim$0.41 T. These findings demonstrate that La${}_3$Pt${}_3$Bi${}_4$ provides a material platform for studying novel superconductivity in the nodal-ring system.

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• Nodal topological superconductivity in nodal-line semimetals
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• Localized f-electron magnetism in the semimetal Ce3Bi4Au3
• Pressure evolution of the normal- and superconducting-state properties of the line-nodal material CaSb${}_2$ revealed by ${}^{123}$Sb nuclear quadrupole resonance
• Nodal-line semimetals and their variance