Observation of two-dimensional superconductivity at the LaAlO3/KTaO3(110) heterointerface

Abstract

We report on the observation of a Tc ~0.9 K superconductivity at the interface between LaAlO3 film and the 5d transition-metal oxide KTaO3(110) single crystal. The interface shows a large anisotropy of the upper critical field, and its superconducting transition is consistent with a Berezinskii-Kosterlitz-Thouless transition. Both facts suggest that the superconductivity is two-dimensional (2D) in nature. The carrier density measured at 5 K is ~7 time 10^13 cm-2. The superconducting layer thickness and coherence length are estimated to be ~8 and ~30 nm, respectively. Our result provides a new platform for the study of 2D superconductivity at oxide interfaces.

10 pages, 4 figures for main text; plus 6 pages, 8 figures for supplemental materials

References in corpus (3)

• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• High-temperature interface superconductivity between metallic and insulating cuprates
• High Tc superconductivity at the interface between the CaCuO2 and SrTiO3 insulating oxides

Cited by in corpus (44)

• Spin-charge interconversion in KTaO${}_3$ two-dimensional electron gases
• Tunable superconductivity at the oxide-insulator/KTaO${}_3$ interface and its origin
• Superfluid stiffness of a KTaO3-based two-dimensional electron gas
• Ferroelectric, quantum paraelectric or paraelectric? Calculating the evolution from BaTiO${}_3$ to SrTiO${}_3$ to KTaO${}_3$ using a single-particle quantum-mechanical description of the ions
• Spontaneous rotational symmetry breaking in KTaO${}_3$ heterointerface superconductors
• Orientation-dependent electron-phonon coupling in interfacial superconductors LaAlO3/KTaO3
• Theory of superconductivity in doped quantum paraelectrics
• Coexistence of ferromagnetism and superconductivity at KTaO${}_3$ heterointerfaces
• Gate-tunability of the superconducting state at the $EuO/KTa{O}_3(111)$ interface
• Nanoscale control of the metal-insulator transition at LAO/KTO (110) and LAO/KTO (111) interfaces
• Large nonlinear Hall effect and Berry curvature in KTaO3 based two-dimensional electron gas
• Coexistence of superconductivity and weak anti-localization at KTaO3 (111) interfaces
• Tunable Ferromagnetism in LaCoO3 Epitaxial Thin Films
• Anisotropic Electronic Structure of the Two-Dimensional Electron Gas at the AlOx/KTaO3(110) interface
• Electronic subbands in the a-LaAlO${}_3$/KTaO${}_3$ interface revealed by quantum oscillations in high magnetic fields
• Ferroelectric tuning of superconductivity and band topology in a two-dimensional heterobilayer
• Observation of surface superconductivity in a three-dimensional Dirac material
• Ionic modulation at the LaAlO${}_3$/KTaO${}_3$ interface for extreme high-mobility two-dimensional electron gas
• Superconductivity at epitaxial LaTiO3-KTaO3 interfaces
• Emergence of high-temperature superconductivity at the interface of two Mott insulators
• Spin-to-charge conversion at KTaO3(111) interfaces
• Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures
• Superconducting quantum oscillations and anomalous negative magnetoresistance in a honeycomb nanopatterned oxide interface superconductor
• Non-collinear and strongly asymmetric polar moments at back-gated SrTiO3 interfaces
• Anisotropic Rashba coupling to polar modes in KTaO3
• Rashba spin-orbit coupling in infinite-layer nickelate films on SrTiO3(001) and KTaO3(001)
• Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces
• Surface charge writing and non-volatile control of superconductivity in LaAlO3/KTaO3(111) heterostructure
• Mechanism for Switchability in Electron-Doped Ferroelectric Interfaces
• Universally enhanced superconductivity and coexisting ferroelectricity at oxide interfaces
• Violation of Pauli Limit at KTaO3(110) Interfaces
• Competing electronic states emerging on polar surfaces
• Superconductivity from the Slater mode: Application to KTaO3 heterostructures
• Orbital and Spin Edelstein Effects in KTaO${}_3$(110) Two-Dimensional Electron Gases
• KTaO3(001) Preparation Methods in Vacuum: Effects on Surface Stoichiometry, Crystallography, and in-gap States
• Exciton-Enhanced Superconductivity in Monolayer Films of Aluminum
• Spin-dependent anisotropic electron-phonon coupling in KTaO${}_3$
• Absence of localized $5d^1$ electrons in KTaO${}_3$ interface superconductors
• Observation of Quantum-Criticality-Class Crossover at the LaAlO${}_3$/KTaO${}_3$ (111) Interface
• A strong polarizing field in thin-film paraelectrics
• Superconductivity in spin-orbit coupled BaBi${}_3$ formed by in situ reduction of bismuthate films
• Orientation-dependent superconductivity and electronic structure of the rare-earth metal/KTaO3 interfaces
• Percolative Pathway to Stripe Order in KTaO3-Based Superconductivity
• Geometric Control of Pairing: Universal Scaling of Superconductivity at KTaO3 Interfaces