Magnetic and Superconducting Ordering at LaAlO3/SrTiO3 Interfaces

Abstract

We formulate a model for magnetic and superconducting ordering at LaAlO3/SrTiO3 interfaces containing both localized magnetic moments and itinerant electrons. Though these both originate in Ti 3d orbitals, the former may be due to electrons more tightly-bound to the interface while the latter are extended over several layers. Only the latter contribute significantly to metallic conduction and superconductivity. In our model, the interplay between the two types of electrons, which is argued to be ferromagnetic, combined with strong spin-orbit coupling of the itinerant electrons, leads to magnetic ordering. Furthermore, we propose a model for interfacial superconductivity, consisting of random superconducting grains in the bulk STO driven, via coupling to the interface conduction band, towards long-ranged or quasi-long-ranged order. Most interestingly, the magnetic order and strong spin orbit coupling can lead in this manner to unconventional interfacial superconductivity, yielding a possible realization of Majorana physics.

11 pages, 7 figures

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Cited by in corpus (34)

• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• A polarity-induced defect mechanism for conductivity and magnetism at polar-nonpolar oxide interfaces
• Nanoscale Phenomena in Oxide Heterostructures
• Room-Temperature Electronically-Controlled Ferromagnetism at the LaAlO3/SrTiO3 Interface
• A Gate-tunable Polarized Phase of Two-Dimensional Electrons at the LaAlO3/SrTiO3 Interface
• Topological superconductivity and unconventional pairing in oxide interfaces
• Origin and Transport Signatures of Spin-Orbit Interactions in One- and Two-Dimensional SrTiO${}_3$-Based Heterostructures
• Double perovskite heterostructures: Magnetism, Chern bands, and Chern insulators
• Evidence of weak superconductivity at the room-temperature grown LaAlO${}_3$/SrTiO${}_3$ interface
• Competition Between Kondo Screening and Magnetism at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Nanoscale Electrostatic Control of Oxide Interfaces
• Route to Topological Superconductivity via Magnetic Field Rotation
• Topological superconductivity and Majorana bound states at the LaAlO${}_3$/SrTiO${}_3$ interface
• Superconducting quantum point contact with split gates in the two dimensional LaAlO3/SrTiO3 superfluid
• Anomalous Transport in Sketched Nanostructures at the LaAlO3/SrTiO3 Interface
• Superconducting LaAlO3/SrTiO3 Nanowires
• Evolution of topological superconductivity by orbital selective confinement in oxide nanowires
• Multi-band theory of superconductivity at the LaAlO${}_3$/SrTiO${}_3$ interface
• Tunable spin and orbital Edelstein effect at (111) LaAlO${}_3$/SrTiO${}_3$ interface
• Oxygen vacancies and hydrogen doping in LaAlO3/SrTiO3 heterostructures: electronic properties and impact on surface and interface reconstruction
• The mechanism of spin-orbit coupling in a 2D oxide interface
• Magnetic and nematic orders of the 2DEG at oxide (111) surfaces and interfaces
• Dislocation Majorana zero modes in perovskite oxide 2DEG
• Quantized critical supercurrent in SrTiO${}_3$-based quantum point contacts
• Hidden Order as a Source of Interface Superconductivity
• Phase segregation of superconductivity and ferromagnetism at LaAlO${}_3$/SrTiO${}_3$ interface
• Anomalous transport near the Lifshitz transition at the LaAlO${}_3$/SrTiO${}_3$ interface
• Spin-orbital polarization of Majorana edge states in oxides nanowires
• Strain-induced topological phase transition at (111) SrTiO${}_3$-based heterostructures
• Anisotropic Magnetoresistance in Multiband Systems: 2DEGs and Polar Metals at Oxide Interfaces
• Torque magnetometry of an amorphous-alumina/strontium-titanate interface
• Domain wall nature of sketched LaAlO3/SrTiO3 nanowires
• A comparative DMFT study of the eg-orbital Hubbard model in thin films