Electronic Reconstruction at the Interface Between Band Insulating Oxides: The LaAlO3/SrTiO3 System

Salluzzo, M.

doi:10.1007/978-3-319-14478-8_10

Cited by 6 publications

(10 citation statements)

References 90 publications

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“…5 ). Electronic conduction of STO can be easily tuned, among other oxides, by chemical doping of a small amount of dopants or by increasing oxygen vacancy concentrations 26 27 28 29 30 . The most likely reason for the higher conductivities of the STO:SDC vertical interfaces is a higher concentration of oxygen vacancies along the vertical interfaces by structural mismatch of the two materials (STO: perovskite, c =0.3905, nm, SDC: fluorite, c =0.5430, nm) than that of the bulk STO part, leading to higher carrier densities along the vertical interfaces 20 ( Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Self-assembled oxide films with tailored nanoscale ionic and electronic channels for controlled resistive switching

et al. 2016

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Resistive switches are non-volatile memory cells based on nano-ionic redox processes that offer energy efficient device architectures and open pathways to neuromorphics and cognitive computing. However, channel formation typically requires an irreversible, not well controlled electroforming process, giving difficulty to independently control ionic and electronic properties. The device performance is also limited by the incomplete understanding of the underlying mechanisms. Here, we report a novel memristive model material system based on self-assembled Sm-doped CeO2 and SrTiO3 films that allow the separate tailoring of nanoscale ionic and electronic channels at high density (∼1012 inch−2). We systematically show that these devices allow precise engineering of the resistance states, thus enabling large on–off ratios and high reproducibility. The tunable structure presents an ideal platform to explore ionic and electronic mechanisms and we expect a wide potential impact also on other nascent technologies, ranging from ionic gating to micro-solid oxide fuel cells and neuromorphics.

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Section: Resultsmentioning

confidence: 99%

Self-assembled oxide films with tailored nanoscale ionic and electronic channels for controlled resistive switching

et al. 2016

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“…Bhattacharya et al [46] review magnetic phenomena at oxide interfaces. There are several reviews that focus on the LaAlO 3 / SrTiO 3 system [42,[50][51][52][53][54], and there is a recent review by Pai et al [55] on magnetism at the LaAlO 3 /SrTiO 3 interface [55]. Pentcheva and Pickett [56], Chen, Kolpak and Ismail-Beigi [51] and Bjaalie et al [45] have written reviews of this system from the perspective of first-principles theory.…”

Section: Outlinementioning

confidence: 99%

“…Using x-ray photoemission spectroscopy (XPS) [336,384] and cross-sectional scanning-tunneling microscopy (STM) [331], the band bending of the conduction band could be observed in LaAlO 3 / SrTiO 3 either by the shifts in the core levels of the Ti (XPS) or by the electron tunneling energy as the interface is approached (STM). Additionally, x-ray magnetic circular dichroism (XMCD) measurements [52,237,385] reveal that the conduction band is dominantly composed of Ti d xy electrons.…”

Section: Other Techniquesmentioning

confidence: 99%

Physics of SrTiO₃-based heterostructures and nanostructures: a review

et al. 2018

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1 Overview 1 1.1 Introduction 1 1.1.1 Oxide growth techniques are rooted in search for high-Tc superconductors 2 1.1.2 First reports of interface conductivity 2 1.2 2D physics 2 1.3 Emergent properties of oxide heterostructures and nanostructures 3 1.4 Outline 3 2 Relevant properties of SrTiO3 3 2.1 Structural properties and transitions 3 2.2 Ferroelectricity, Paraelectricity and Quantum Paraelectricity 4 2.3 Electronic structure 5 2.4 Defects 6 2.4.1 Oxygen vacancies 6 2.4.2 Terraces 7 2.5 Superconductivity 7 3 SrTiO3-based heterostructures and nanostructures 8 3.1 Varieties of heterostructures 8 3.1.1 SrTiO3 only 9 3.1.2 LaAlO3/SrTiO3 9 3.1.3 Other heterostructures formed with SrTiO3 10 3.2 Thin-film growth 10 3.2.1 Substrates 10 3.2.2 SrTiO3 surface treatment 11 3.2.3 Pulsed Laser Deposition 11 3.2.4 Atomic Layer Deposition 13 3.2.5 Molecular Beam Epitaxy 14 3.2.6 Sputtering 15 3.3 Device Fabrication 15 3.3.1 "Conventional" photolithography - Thickness Modulation, hard masks, etc. 15 3.3.2 Ion beam irradiation 16 3.3.3 Conductive-AFM lithography 16 4 Properties and phase diagram of LaAlO3/SrTiO3 16 4.1 Insulating state 16 4.2 Conducting state 17 4.2.1 Confinement thickness (the depth profile of the 2DEG) 17 4.3 Metal-insulator transition and critical thickness 18 4.3.1 Polar catastrophe ( electronic reconstruction) 18 4.3.2 Oxygen Vacancies 19 4.3.3 Interdiffusion 20 4.3.4 Polar Interdiffusion + oxygen vacancies + antisite pairs 20 4.3.5 Role of surface adsorbates 21 4.3.6 Hidden FE like distortion - Strain induced instability 21 4.4 Structural properties and transitions 21 4.5 Electronic band structure 22 4.5.1 Theory 22 4.5.2 Experiment 23 4.5.3 Lifshitz transition 24 4.6 Defects, doping, and compensation 25 4.7 Magnetism 25 4.7.1 Experimental evidence 25 4.7.2 Two types of magnetism 27 4.7.3 Ferromagnetism 27 4.7.4 Metamagnetism 28 4.8 Superconductivity 28 4.9 Optical properties 29 4.9.1 Photoluminesce experiments 29 4.9.2 Second Harmonic Generation 29 4.10 Coexistence of superconductivity and magnetism 30 4.11 Magnetic and conducting phases 30 5 Quantum transport in LaAlO3/SrTiO3 heterostructures and microstructures 31 5.1 2D transport 31 5.2 Inhomogeneous Transport 31 5.3 Anisotropic Magnetoresistance 32 5.4 Spin-orbit coupling 32 5.5 Anomalous Hall Effect 34 5.6 Shubnikov-de Haas (SdH) Oscillation 35 5.7 Quantum Hall Effect 37 5.8 Spintronic Effects 38 6 Quantum transport in LaAlO3/SrTiO3 nanostructures 39 6.1 Quasi-1D Superconductivity 39 6.2 Universal conductance fluctuations 40 6.3 Dissipationless Electronic Waveguides 40 6.4 Superconducting Quantum Interference Devices (SQUID) 41 6.5 Electron pairing without superconductivity 41 6.6 Tun...

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“…At this stage it is not even agreed that all samples consistently exhibits magnetic signatures [68,69] and, for those who do, one needs to clarify the role played by the fabrication technique, and in particular the issue of annealing [70]. Review papers by Salluzzo [71] and by Sulpizio et al [72] discuss various experimental aspects related to this point.…”

Section: Bulk and Interface Superconductivitymentioning

confidence: 99%

Interface superconductivity

Gariglio

Gabay

Mannhart

et al. 2015

Physica C: Superconductivity and its Applications

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Low dimensional superconducting systems have been the subject of numerous studies for many years. In this article, we focus our attention on interfacial superconductivity, a field that has been boosted by the discovery of superconductivity at the interface between the two band insulators LaAlO 3 and SrTiO 3 .We explore the properties of this amazing system that allows the electric field control and on/off switching of superconductivity. We discuss the similarities and differences between bulk doped SrTiO 3 and the interface system and the possible role of the interfacially induced Rashba type spin-orbit. We also, more briefly, discuss interface superconductivity in cuprates, in electrical double layer transistor field effect experiments, and the recent observation of a high T c in a monolayer of FeSe deposited on SrTiO 3 .

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Electronic Reconstruction at the Interface Between Band Insulating Oxides: The LaAlO3/SrTiO3 System

Cited by 6 publications

References 90 publications

Self-assembled oxide films with tailored nanoscale ionic and electronic channels for controlled resistive switching

Self-assembled oxide films with tailored nanoscale ionic and electronic channels for controlled resistive switching

Physics of SrTiO₃-based heterostructures and nanostructures: a review

Interface superconductivity

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Electronic Reconstruction at the Interface Between Band Insulating Oxides: The LaAlO3/SrTiO3 System

Cited by 6 publications

References 90 publications

Self-assembled oxide films with tailored nanoscale ionic and electronic channels for controlled resistive switching

Self-assembled oxide films with tailored nanoscale ionic and electronic channels for controlled resistive switching

Physics of SrTiO3-based heterostructures and nanostructures: a review

Interface superconductivity

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Physics of SrTiO₃-based heterostructures and nanostructures: a review