Superconductivity beyond the Conventional Pauli Limit in High-Pressure CeSb2

We report the discovery of superconductivity at a pressure-induced magnetic quantum phase transition in the Kondo lattice system CeSb2, sustained up to magnetic fields that exceed the conventional Pauli limit eightfold. Like CeRh2As2, CeSb2 is locally noncentrosymmetric around the Ce site, but the evolution of critical fields and normal state properties as CeSb2 is tuned through the quantum phase transition motivates a fundamentally different explanation for its resilience to applied field.

Automated summary

We report the discovery of superconductivity in the Kondo lattice system CeSb2 at a pressure-induced magnetic quantum phase transition, which can be sustained at magnetic fields exceeding the conventional Pauli limit by eightfold. Unlike CeRh2As2, CeSb2 shows local noncentrosymmetry around the Ce site, but the evolution of critical fields and normal state properties in CeSb2 under the quantum phase transition requires a fundamentally different explanation for its resistance to applied field.