Coexistence of superconductivity and weak anti-localization at KTaO3 (111) interfaces

Abstract

The intersection of two-dimensional superconductivity and topologically nontrivial states hosts a wide range of quantum phenomena, including Majorana fermions. Coexistence of topologically nontrivial states and superconductivity in a single material, however, remains elusive. Here, we report on the observation of two-dimensional superconductivity and weak anti-localization at the TiOx/KTaO3(111) interfaces. A remnant, saturating resistance persists below the transition temperature as superconducting puddles fail to reach phase coherence. Signatures of weak anti-localization are observed below the superconducting transition, suggesting the coexistence of superconductivity and weak anti-localization. The superconducting interfaces show roughly one order of magnitude larger weak anti-localization correction, compared to non-superconducting interfaces, alluding to a relatively large coherence length in these interfaces.

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Cited by in corpus (6)

• Enhanced Critical Field of Superconductivity at an Oxide Interface
• Molecular Beam Epitaxy of KTaO${}_3$
• Superconductivity at epitaxial LaTiO3-KTaO3 interfaces
• Spin-to-charge conversion at KTaO3(111) interfaces
• Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures
• Violation of Pauli Limit at KTaO3(110) Interfaces