Strong electronic correlation and strain effects at the interfaces between polar and nonpolar complex oxides

Abstract

The interface between the polar LaAlO${}_3$ and nonpolar SrTiO${}_3$ layers has been shown to exhibit various electronic and magnetic phases such as two dimensional electron gas, superconductivity, magnetism and electronic phase separation. These rich phases are expected due to the strong interplay between charge, spin and orbital degree of freedom at the interface between these complex oxides, leading to the electronic reconstruction in this system. However, until now all of these new properties have been studied extensively based on the interfaces which involve a polar LaAlO${}_3$ layer. To investigate the role of the A and B cationic sites of the ABO${}_3$ polar layer, here we study various combinations of polar/nonpolar oxide (NdAlO${}_3$/SrTiO${}_3$, PrAlO${}_3$/SrTiO${}_3$ and NdGaO${}_3$/SrTiO${}_3$) interfaces which are similar in nature to LaAlO${}_3$/SrTiO${}_3$ interface. Our results show that all of these new interfaces can also produce 2DEG at their interfaces, supporting the idea that the electronic reconstruction is the driving mechanism for the creation of the 2DEG at these oxide interfaces. Furthermore, the electrical properties of these interfaces are shown to be strongly governed by the interface strain and strong correlation effects provided by the polar layers. Our observations may provide a novel approach to further tune the properties of the 2DEG at the selected polar/nonpolar oxide interfaces.

5 pages, 4 figures

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Cited by in corpus (15)

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• Oxide spin-orbitronics: spin-charge interconversion and topological spin textures
• Persistent photoconductivity in 2-dimensional electron gases at different oxide interfaces
• Accumulation, inversion, and depletion layers in SrTiO${}_3$
• The Conducting Channel at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Evolution of variable range hopping in strongly localized two dimensional electron gas at NdAlO3/SrTiO3 (100) heterointerfaces
• Tuning the superconducting transition of SrTiO${}_3$-based 2DEGs with light
• Anomalous conductivity, Hall factor, magnetoresistance, and thermopower of accumulation layer in ${\text{SrTiO}}_3$
• Conducting LaAlO3/SrTiO3 heterointerfaces on atomically flat substrates prepared by deionized-water
• Electron gas induced in SrTiO${}_3$
• Spin-Orbit Interaction and Kondo Scattering at the PrAlO${}_3$/SrTiO${}_3$ Interface: Effects of Oxygen Content
• Tunable Magnetic Properties in Sr${}_2$FeReO${}_6$ Double-Perovskite
• High-mobility two-dimensional electron gas in $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$ heterostructures
• Anomalous Thermodynamic Properties of Electron Accumulation Layer in SrTiO${}_3$