Metallic and insulating interfaces of amorphous SrTiO3-based oxide heterostructures

Abstract

The conductance confined at the interface of complex oxide heterostructures provides new opportunities to explore nanoelectronic as well as nanoionic devices. Herein we show that metallic interfaces can be realized in SrTiO3-based heterostructures with various insulating overlayers of amorphous LaAlO3, SrTiO3 and yttria-stabilized zirconia films. On the other hand, samples of amorphous La7/8Sr1/8MnO3 films on SrTiO3 substrates remain insulating. The interfacial conductivity results from the formation of oxygen vacancies near the interface, suggesting that the redox reactions on the surface of SrTiO3 substrates play an important role.

17 pages, 4 figures

References in corpus (6)

• Magnetic effects at the interface between nonmagnetic oxides
• The role of oxygen vacancies in SrTiO3 at the LaAlO3/SrTiO3 interface
• Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
• Profiling the interface electron gas of LaAlO3/SrTiO3 heterostructures by hard X-ray photoelectron spectroscopy
• Two-dimensional quantum oscillations of the conductance at LaAlO3/SrTiO3 interfaces
• Charge writing at the LaAlO3/SrTiO3 surface

Cited by in corpus (77)

• A high-mobility two-dimensional electron gas at the heteroepitaxial spinel/perovskite complex oxide interface of γ-Al2O3/SrTiO3
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Origin of the two-dimensional electron gas at LaAlO3/SrTiO3 interfaces: The role of oxygen vacancies and electronic reconstruction
• LaAlO3 stoichiometry found key to electron liquid formation at LaAlO3/SrTiO3 interfaces
• High mobility conduction at (110) and (111) LaAlO3/SrTiO3 interfaces
• Oxide spin-orbitronics: spin-charge interconversion and topological spin textures
• Universal Fabrication of Two-Dimensional Electron Systems in Functional Oxides
• Origin of two-dimensional electron gases at oxide interfaces: insights from theory
• Nanoscale Phenomena in Oxide Heterostructures
• Unexpected Anisotropic Two Dimensional Electron Gas at the LaAlO3/SrTiO3 (110) Interface
• Defect engineering in oxide heterostructures by enhanced oxygen surface exchange
• Control of a two-dimensional electron gas on SrTiO3(111) by atomic oxygen
• Mixed Dimensionality of Confined Conducting Electrons in the Surface Region of SrTiO${}_3$
• Creation of high mobility two-dimensional electron gases via strain induced polarization at an otherwise nonpolar complex oxide interface
• Visible light enhanced field effect at LaAlO3/SrTiO3 interface
• Room temperature formation of high-mobility two-dimensional electron gases at crystalline complex oxide interfaces
• Electronic reconstruction at the isopolar LaTiO3/LaFeO3 interface: An x-ray photoemission and density functional theory study
• Phase separation from electron confinement at oxide interfaces
• Persistent photoconductivity in 2-dimensional electron gases at different oxide interfaces
• Giant tunability of the two-dimensional electron gas at the interface of gamma-Al2O3/SrTiO3
• Evidence of weak superconductivity at the room-temperature grown LaAlO${}_3$/SrTiO${}_3$ interface
• Creating Two-Dimensional Electron Gas in Nonpolar Oxide Interface via Polarization Discontinuity: First-Principles Analysis of CaZrO3/SrTiO3 Heterostructure
• The Effect of Polar Fluctuation and Lattice Mismatch on Carrier Mobility at Oxide Interfaces
• Direct demonstration of the emergent magnetism resulting from the multivalence Mn in a LaMnO3 epitaxial thin film system
• Oxygen Electromigration and Energy Band Reconstruction Induced by Electrolyte Field Effect at Oxide Interfaces
• Absence of Superconductivity in Nd${}_{0.8}$Sr${}_{0.2}$NiO${}_x$ Thin Films without Chemical Reduction
• High-Mobility Two-Dimensional Electron Gases at Oxide Interfaces: Origins and Opportunities
• Photoresponse dynamics in amorphous-LaAlO${}_3$/SrTiO${}_3$ interfaces
• Tuning the two-dimensional electron liquid at oxide interfaces by buffer-layer-engineered redox reactions
• Large band offset as driving force of 2-dimensional electron confinement: the case of SrTiO${}_3$/SrZrO${}_3$ interface
• Bandgap Controlling of the Oxygen-Vacancy-Induced Two-Dimensional Electron Gas in SrTiO3
• Dominant role of oxygen vacancies in electrical properties of unannealed LaAlO3/SrTiO3 interfaces
• Critical influence of target-to-substrate distance on conductive properties of LaGaO3/SrTiO3 interfaces deposited at 10-1 mbar oxygen pressure
• Origin of interfacial conductivity at complex oxide heterointerfaces: possibility of electron transfer from water chemistry at surface oxygen vacancies
• Suppressed carrier density for the patterned high mobility two-dimensional electron gas at gamma-Al2O3/SrTiO3 heterointerfaces
• Evolution of the SrTiO${}_3$ surface electronic state as a function of LaAlO${}_3$ overlayer thickness
• SrTiO${}_3$ termination control: A method to tailor the oxygen exchange kinetics
• Patterning of high mobility electron gases at complex oxide interfaces
• Metallicity of the SrTiO3 surface induced by room temperature evaporation of alumina
• Infrared ellipsometry study of the confined electrons in a high-mobility $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$ heterostructure
• Two-dimensional electron-gas-like charge transport at magnetic Heusler alloy-SrTiO${}_3$ interface
• 2D surprises at the surface of 3D materials: confined electron systems in transition metal oxides
• A two-dimensional electron gas based on a 5s oxide with high room-temperature mobility and strain sensitivity
• Characteristic Lengths of Interlayer Charge-Transfer in Correlated Oxide Heterostructures
• Understanding Leakage Currents through $A{l}_2{O}_3$ on $SrTi{O}_3$
• Anisotropic electronic transport of the two-dimensional electron system in Al2O3/SrTiO3 heterostructures
• Universality of Electron Mobility in LaAlO${}_3$/SrTiO${}_3$ and bulk SrTiO${}_3$
• Ionic modulation at the LaAlO${}_3$/KTaO${}_3$ interface for extreme high-mobility two-dimensional electron gas
• Gate-tunable superconductivity at SrTiO3 surface realized by Al layer evaporation
• Conducting interfaces between amorphous oxide layers and SrTiO3(110) and SrTiO3(111)
• Observation of strontium segregation in LaAlO${}_3$/SrTiO${}_3$ and NdGaO${}_3$/SrTiO${}_3$ oxide heterostructures by X-ray photoemission spectroscopy
• Controlling the electronic interface properties of AlO${}_x$/SrTiO${}_3$ heterostructures
• Scalable $\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3-\mathrm{Ti}{\mathrm{O}}_2$ Conductive Oxide Interfaces as Defect Reservoirs for Resistive Switching Devices
• Band offsets at amorphous-crystalline $A{l}_2{O}_3-SrTi{O}_3$ oxide interfaces
• Infrared study of the quasi-two-dimensional electron system at the interface between SrTiO${}_3$ and crystalline or amorphous LaAlO${}_3$
• Effect of Sr-doping of LaMnO3 spacer on modulation-doped two-dimensional electron gases at oxide interfaces
• Nature of electrons from oxygen vacancies and polar catastrophe at LaAlO3/SrTiO3 interfaces
• Spin-Orbit Interaction and Kondo Scattering at the PrAlO${}_3$/SrTiO${}_3$ Interface: Effects of Oxygen Content
• Electronic Reconstruction Enhanced Tunneling Conductance at Terrace Edges of Ultrathin Oxide Films
• Enhancement of electron mobility at oxide interfaces induced by WO3 overlayers
• Gate voltage control of the $Al{O}_x$/$SrTi{O}_3$ interface electrical properties
• Hard x-ray angle-resolved photoemission from a buried high-mobility electron system
• Inhomogeneous superconductivity and quasilinear magnetoresistance at amorphous LaTiO3/SrTiO3 interfaces
• Growth-Temperature Dependence of Conductivity at the LaCrO${}_3$/SrTiO${}_3$ (001) Interface
• Current-induced nonuniform enhancement of sheet resistance in Ar+ irradiated SrTiO3
• Anisotropic electronic transport and Rashba effect of the two-dimensional electron system in (110) SrTiO${}_3$-based heterostructures
• Interplay between density and superconducting quantum critical fluctuations
• Room temperature charge-to-spin conversion from q-2DEG at SrTiO3-based interfaces
• Two-Dimensional Charge Localization at the Perovskite Oxide Interface
• Spin-Hall Current and Nonlocal Transport in Ferromagnet-Free Multi-band models for SrTiO3-Based Nanodevices in the presence of impurities
• Non-van der Waals Heterostructures
• Leveraging high fluence and low pressure for pulsed laser deposition of high-mobility $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$ heterostructure growth
• Temperature dependent giant resistance anomaly in LaAlO3/SrTiO3 nanostructures
• Lithography-free patterning of SrTiO${}_3$-based two-dimensional electron gases using direct atomic layer processing
• Extreme mobility enhancement of two-dimensional electron gases at oxide interfaces via charge transfer induced modulation doping
• Superfluid response of two-dimensional filamentary superconductors
• Coupling between tilts and charge carriers at polar-nonpolar perovskite interfaces