Evidence of weak superconductivity at the room-temperature grown LaAlO${}_3$/SrTiO${}_3$ interface

Abstract

The two-dimensional electron gas at the crystalline LaAlO${}_3$/SrTiO${}_3$ (c-LAO/STO) interface has sparked large interest due to its exotic properties including an intriguing gate-tunable superconducting phase. While there is growing evidence of pronounced spatial inhomogeneity in the conductivity at STO-based interfaces, the consequences for superconductivity remain largely unknown. We study interfaces based on amorphous LAO top layers grown at room temperature (a-LAO/STO) and demonstrate a superconducting phase similar to c-LAO/STO, however, with a gate-tunable critical temperature of $460\mathrm{mK}$, higher than any previously reported values for c-LAO/STO. The dependence of the superconducting critical current on temperature, magnetic field and backgate-controlled doping is found to be consistently described by a model of a random array of Josephson-coupled superconducting domains.

6 pages, 5 figures

References in corpus (10)

• Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Tunable Supercurrent Through Semiconductor Nanowires
• Universal self-field critical current for thin-film superconductors
• Magnetic and Superconducting Ordering at LaAlO3/SrTiO3 Interfaces
• Evidence for charge-vortex duality at the LaAlO${}_3$/SrTiO${}_3$ interface
• Patterning of high mobility electron gases at complex oxide interfaces
• Pseudo-gap in tunneling spectra as a signature of inhomogeneous superconductivity in oxide interfaces
• Evidence for Superconducting Phase Coherence in the Metallic/Insulating Regime of the LaAlO3-SrTiO3 Interface Electron System
• Origin of Hysteresis in a Proximity Josephson Junction

Cited by in corpus (22)

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• Tuning the two-dimensional electron liquid at oxide interfaces by buffer-layer-engineered redox reactions
• Negative electronic compressibility and nanoscale inhomogeneity in ionic-liquid gated two-dimensional superconductors
• Correlation between Superconductivity, Band Filling and Electron Confinement at the LaAlO${}_3$-SrTiO${}_3$ Interface
• Universality of Electron Mobility in LaAlO${}_3$/SrTiO${}_3$ and bulk SrTiO${}_3$
• Gate-tunable superconductivity at SrTiO3 surface realized by Al layer evaporation
• Charge-Density Waves vs. Superconductivity: Some Results and Future Perspectives
• Quantized critical supercurrent in SrTiO${}_3$-based quantum point contacts
• Superconducting magic-angle twisted trilayer graphene hosts competing magnetic order and moiré inhomogeneities
• Effect of Cu doping on superconductivity in TaSe${}_3$: Relationship between superconductivity and induced charge density wave
• Density inhomogeneities and Rashba spin-orbit coupling interplay in oxide interfaces
• Effect of Sr-doping of LaMnO3 spacer on modulation-doped two-dimensional electron gases at oxide interfaces
• Ionic liquid gating of SrTiO${}_3$ lamellas fabricated with a focused ion beam
• Coexistence of high electron-mobility, unpaired spins, and superconductivity at high carrier density SrTiO${}_3$-based interfaces
• Inhomogeneous superconductivity and quasilinear magnetoresistance at amorphous LaTiO3/SrTiO3 interfaces
• Quantum oscillations in an optically-illuminated two-dimensional electron system at the LaAlO${}_3$/SrTiO${}_3$ interface
• Study and characterization of SrTiO3 surface
• Density-tuned isotherms and dynamic change at phase transition in a gate-controlled superconducting system
• Superfluid response of two-dimensional filamentary superconductors
• Lithography-free patterning of SrTiO${}_3$-based two-dimensional electron gases using direct atomic layer processing