Multi-band superconductivity and nanoscale inhomogeneity at oxide interfaces

Abstract

The two-dimensional electron gas at the LaTiO3/SrTiO3 or LaAlO3/SrTiO3 oxide interfaces becomes superconducting when the carrier density is tuned by gating. The measured resistance and superfluid density reveal an inhomogeneous superconductivity resulting from percolation of filamentary structures of superconducting "puddles" with randomly distributed critical temperatures, embedded in a non-superconducting matrix. Following the evidence that superconductivity is related to the appearance of high-mobility carriers, we model intra-puddle superconductivity by a multi-band system within a weak coupling BCS scheme. The microscopic parameters, extracted by fitting the transport data with a percolative model, yield a consistent description of the dependence of the average intra-puddle critical temperature and superfluid density on the carrier density.

arXiv comment7 pages with 3 figures + supplemental material (4 pages and 5 figures)

References in corpus (19)

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Cited by in corpus (32)

• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Phase separation from electron confinement at oxide interfaces
• Evidence of weak superconductivity at the room-temperature grown LaAlO${}_3$/SrTiO${}_3$ interface
• Spectroscopic evidence for strong correlations between local superconducting gap and local Altshuler-Aronov density-of-states suppression in ultrathin NbN films
• Unconventional multi-band superconductivity in bulk SrTiO${}_3$ and LaAlO${}_3$/SrTiO${}_3$ interfaces
• Competition between electron pairing and phase coherence in superconducting interfaces
• Phase diagrams of voltage-gated oxide interfaces with strong Rashba coupling
• Spectromicroscopy of electronic phase separation in K${}_x$Fe${}_{2-y}$Se${}_2$ superconductor
• Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO${}_3$/SrTiO${}_3$ interface
• Effect of disorder on superconductivity and Rashba spin-orbit coupling in LaAlO3/SrTiO3 interfaces
• Theory of superconductivity mediated by Rashba coupling in incipient ferroelectrics
• Negative electronic compressibility and nanoscale inhomogeneity in ionic-liquid gated two-dimensional superconductors
• Multi-band theory of superconductivity at the LaAlO${}_3$/SrTiO${}_3$ interface
• Inhomogeneous multi-carrier superconductivity at LaXO3/SrTiO3 (X=Al or Ti) oxide interfaces
• Pseudo-gap in tunneling spectra as a signature of inhomogeneous superconductivity in oxide interfaces
• High magnetic field superconductivity in a two-band superconductor
• Protected superconductivity at the boundaries of charge-density-wave domains
• Charge-Density Waves vs. Superconductivity: Some Results and Future Perspectives
• Anomalous transport near the Lifshitz transition at the LaAlO${}_3$/SrTiO${}_3$ interface
• Flux-flow instability across Berezinskii Kosterlitz Thouless phase transition in KTaO${}_3$ (111) based superconductor
• Effect of Cu doping on superconductivity in TaSe${}_3$: Relationship between superconductivity and induced charge density wave
• Cuprate Twistronics for Quantum Hardware
• Possible mechanisms of electronic phase separation in oxide interfaces
• Density inhomogeneities and Rashba spin-orbit coupling interplay in oxide interfaces
• Ionic liquid gating of SrTiO${}_3$ lamellas fabricated with a focused ion beam
• Phase separation and long wave-length charge instabilities in spin-orbit coupled systems
• Coexistence of high electron-mobility, unpaired spins, and superconductivity at high carrier density SrTiO${}_3$-based interfaces
• Interplay between density and superconducting quantum critical fluctuations
• Influence of the vicinal substrate miscut on the anisotropic two-dimensional electronic transport in Al2O3-SrTiO3 heterostructures
• Density driven fluctuations in a two-dimensional superconductor
• Quasi-${\Phi }_0$-periodic supercurrent at quantum Hall transitions
• Superfluid response of two-dimensional filamentary superconductors