Insulator-to-Metal Transition at Oxide Interfaces Induced by WO3 Overlayers

Title

Insulator-to-Metal Transition at Oxide Interfaces Induced by WO3 Overlayers

 Author

Mattoni, G. (TU Delft QN/Caviglia Lab; Kavli institute of nanoscience Delft)
Baek, David J. (Cornell University)
Manca, N. (TU Delft QN/Caviglia Lab; Kavli institute of nanoscience Delft)
Verhagen, N.F. (Kavli institute of nanoscience Delft; Student TU Delft)
Groenendijk, D.J. (TU Delft QN/Caviglia Lab; Kavli institute of nanoscience Delft)
Kourkoutis, Lena F. (Cornell University)
Filippetti, Alessio (University of Cagliari; CNR-IOM)
Caviglia, A. (TU Delft QN/Caviglia Lab) ORCID 0000-0001-9650-3371

 Date

2017-12-06

 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.


 Subject

high mobility
LaAlO/SrTiO interface
metal-insulator
quantum oscillations
strong classical magnetoresistance
two-dimensional electron systems
WO overlayers

 To reference this document use:

http://resolver.tudelft.nl/uuid:5757f8cb-e964-4b40-839e-b812d2b5f246

 DOI

https://doi.org/10.1021/acsami.7b13202

 Embargo date

2018-11-07

 ISSN

1944-8244

 Source

ACS applied materials & interfaces, 9 (48), 42336-42343

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2017 G. Mattoni, David J. Baek, N. Manca, N.F. Verhagen, D.J. Groenendijk, Lena F. Kourkoutis, Alessio Filippetti, A. Caviglia
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