Conducting LaAlO3/SrTiO3 heterointerfaces on atomically flat substrates prepared by deionized-water

Abstract

We have investigated how the recently-developed water-leaching method for atomically-flat SrTiO3 (STO) substrates affects the transport properties of LaAlO3 (LAO) and STO heterointerfaces. Using pulsed laser deposition at identical growth conditions, we have synthesized epitaxial LAO thin-films on two different STO substrates, which are prepared by water-leaching and buffered hydrofluoric acid (BHF) etching methods. The structural, transport, and optical properties of LAO/STO heterostructures grown on water-leached substrates show the same high-quality as the samples grown on BHF-etched substrates. These results indicate that the water-leaching method can be used to grow complex oxide heterostructures with atomically well-defined heterointerfaces without safety concerns.

arXiv comment10 pages, 4 figures

References in corpus (19)

• Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
• The role of oxygen vacancies in SrTiO3 at the LaAlO3/SrTiO3 interface
• High Mobility in LaAlO3/SrTiO3 Heterostructures: Origin, Dimensionality and Perspectives
• Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
• Coexistence of superconductivity and ferromagnetism in two dimensions
• Electrostatic carrier doping of GdTiO3/SrTiO3 interfaces
• Polar Discontinuity Doping of the LaVO_3/SrTiO_3 Interface
• Nonlinear Hall effect and multichannel conduction in LaTiO3/SrTiO3 superlattices
• Shubnikov-de Haas oscillations in SrTiO3\LaAlO3 interface
• Thickness dependence of the mobility at the LaAlO_3 / SrTiO_3 interface
• Multiple conducting carriers generated in LaAlO3/SrTiO3 heterostructures
• Optical Study of the Free Carrier Response of LaTiO3/SrTiO3 Superlattices
• Strong electronic correlation and strain effects at the interfaces between polar and nonpolar complex oxides
• Unintentional F doping of the surface of SrTiO3(001) etched in HF acid -- structure and electronic properties
• Charge states and magnetic ordering in LaMnO3/SrTiO3 superlattices
• Growth-induced electron mobility enhancement at the LaAlO${}_3$/SrTiO${}_3$ interface
• Low-temperature dependence of the thermo-magnetic transport properties of the SrTiO3/LaAlO3 interface
• Two components for one resistivity in LaVO3/SrTiO3 heterostructures
• Influence of gas ambient on charge writing at the LaAlO3/SrTiO3 heterointerface