Enhanced Critical Field of Superconductivity at an Oxide Interface

Abstract

The nature of superconductivity and its interplay with strong spin-orbit coupling at the KTaO3(111) interfaces remains a subject of debate. To address this problem, we grew epitaxial LaMnO3/KTaO3(111) heterostructures. We show that superconductivity is robust against the in-plane magnetic field, with the critical field of superconductivity reaching 25 T in optimally doped heterostructures. The superconducting order parameter is highly sensitive to carrier density. We argue that spin-orbit coupling drives the formation of anomalous quasiparticles with vanishing magnetic moment, providing the condensate significant immunity against magnetic fields beyond the Pauli paramagnetic limit. These results offer design opportunities for superconductors with extreme resilience against magnetic field.

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Cited by in corpus (9)

• Advances in Complex Oxide Quantum Materials Through New Approaches to Molecular Beam Epitaxy
• Coexistence of ferromagnetism and superconductivity at KTaO${}_3$ heterointerfaces
• Spin-to-charge conversion at KTaO3(111) interfaces
• Superconductivity in tin telluride films grown by molecular beam epitaxy
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• Electronic spin susceptibility in metallic strontium titanate
• Spin-dependent anisotropic electron-phonon coupling in KTaO${}_3$
• Effect of Underlayer Induced Charge Carrier Substitution on the Superconductivity of Ti40V60 Alloy Thin Films
• Superconductivity in spin-orbit coupled BaBi${}_3$ formed by in situ reduction of bismuthate films