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.

References in corpus (9)

• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Discovery of two-dimensional anisotropic superconductivity at KTaO${}_3$ (111) interfaces
• Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid
• Electric field control of disorder-tunable superconductivity and the emergence of quantum metal at an oxide interface
• Observation of two-dimensional superconductivity at the LaAlO3/KTaO3(110) heterointerface
• Order-Disorder Ferroelectric Transition of Strained SrTiO3
• Band Structure and Spin-Orbital Texture of the (111)-KTaO3 Two-Dimensional Electron Gas
• Possible signatures of mixed-parity superconductivity in doped polar SrTiO3 films
• Novel metal-insulator-transition at the SrTiO3/SmTiO3 interface

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