Insulator-to-Metal Transition at Oxide Interfaces Induced by WO<sub>3</sub> Overlayers

Journal article (2017)

Authors

G. Mattoni Kavli institute of nanoscience Delft, QN/Caviglia Lab - AS
David J. Baek Cornell University
N. Manca Kavli institute of nanoscience Delft, QN/Caviglia Lab - AS
N.F. Verhagen Kavli institute of nanoscience Delft, Student
D.J. Groenendijk Kavli institute of nanoscience Delft, QN/Caviglia Lab - AS
Lena F. Kourkoutis Cornell University
Alessio Filippetti CNR-IOM, University of Cagliari
A. Caviglia QN/Caviglia Lab - AS
Research Group
QN/Caviglia Lab (AS) (TU Delft)
Copyright: © 2017 G. Mattoni, David J. Baek, N. Manca, N.F. Verhagen, D.J. Groenendijk, Lena F. Kourkoutis, Alessio Filippetti, A. Caviglia
DOI
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https://doi.org/10.1021/acsami.7b13202
High mobility LaAlO/SrTiO interface Metal-insulator Quantum oscillations Strong classical magnetoresistance Two-dimensional electron systems WO overlayers
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Published Date

06-12-2017

Language

English

Reuse Rights

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Caviglia Lab

Abstract

Interfaces between complex oxides constitute a unique playground for two-dimensional electron systems (2DESs), where superconductivity and magnetism can arise from combinations of bulk insulators. The 2DES at the LaAlO3/SrTiO3 interface is one of the most studied in this regard, and its origin is determined by the polar field in LaAlO3 as well as by the presence of point defects, like oxygen vacancies and intermixed cations. These defects usually reside in the conduction channel and are responsible for a decrease of the electronic mobility. In this work, we use an amorphous WO3 overlayer to obtain a high-mobility 2DES in WO3/LaAlO3/SrTiO3 heterostructures. The studied system shows a sharp insulator-to-metal transition as a function of both LaAlO3 and WO3 layer thickness. Low-temperature magnetotransport reveals a strong magnetoresistance reaching 900% at 10 T and 1.5 K, the presence of multiple conduction channels with carrier mobility up to 80 000 cm2 V-1 s-1, and quantum oscillations of conductance.

Files

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