Robust Superconductivity Beyond the Pauli Limit at KTaO₃ Interfaces

The nature of superconductivity and its interaction with the strong spin–orbit coupling at KTaO3 interfaces remains a topic of debate. To explore this relationship we synthesized high-quality epitaxial LaMnO₃/KTaO₃(111) and LaMnO₃/KTaO₃(110) heterostructures using molecular beam epitaxy. Our results reveal that superconductivity in these systems is remarkably robust against in-plane magnetic fields, with the critical field reaching up to 25 T in optimally doped samples. The superconductivity exhibits record violation of the Pauli limit with Hc2/Hp ~ 9. We propose that strong spin–orbit coupling leads to the formation of anomalous quasiparticles with nearly vanishing magnetic moments. In conjunction with spin-orbit scattering, this effect gives rise to a superconducting condensate exceptionally resistant to magnetic pair-breaking effects beyond the conventional Pauli paramagnetic limit. These findings open new pathways for designing superconductors with extraordinary resilience to magnetic fields.