Electron energy loss spectroscopy determination of Ti oxidation state at the (001) LaAIO3/SrTiO3 interface as a function of LaAIO3 growth conditions

J.-L. Maurice; G. Herranz; C. Colliex; I. Devos; C. Carrétéro; A. Barthélémy; K. Bouzehouane; S. Fusil; D. Imhoff; É. Jacquet; F. Jomard; D. Ballutaud; M. Basletic

doi:10.1209/0295-5075/82/17003

All issues

Volume 82 / No 1 (April 2008)

EPL, 82 1 (2008) 17003

Abstract

Issue		EPL Volume 82, Number 1, April 2008


Article Number		17003
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/82/17003
Published online		05 March 2008

EPL, 82 (2008) 17003

Electron energy loss spectroscopy determination of Ti oxidation state at the (001) LaAIO₃/SrTiO₃ interface as a function of LaAIO₃ growth conditions

J.-L. Maurice¹, G. Herranz¹, C. Colliex², I. Devos³, C. Carrétéro¹, A. Barthélémy¹, K. Bouzehouane¹, S. Fusil¹, D. Imhoff², É. Jacquet¹, F. Jomard⁴, D. Ballutaud⁴ and M. Basletic¹

¹ Unité mixte de physique CNRS/Thales and Université Paris-Sud-XI - Route départementale 128, 91767 Palaiseau cedex, France, EU
² Laboratoire de physique des solides CNRS UMR8502, Université Paris-Sud-11 - 91405 Orsay cedex, France, EU
³ Institut d'électronique, de microélectronique et de nanotechnologie, Unité Mixte de Recherche CNRS 8520 avenue Poincaré, BP 69, 59652 Villeneuve d'Ascq cedex, France, EU
⁴ GEMaC-UMR 8635, CNRS - 1 place Aristide Briand, 92195 Meudon cedex, France, EU

Corresponding author: jean-luc.maurice@thalesgroup.com

Received: 1 December 2007
Accepted: 5 February 2008

Abstract

After the epitaxy of LaAlO₃ on a TiO₂-terminated {100} surface of SrTiO₃, a high-mobility electron gas may appear, which has been the object of numerous works over the last four years. Its origin is a subject of debate between the interface polarity and unintended doping. Here we use electron energy loss “spectrum images”, recorded in cross-section in a scanning transmission electron microscope, to analyse the Ti³⁺ ratio, characteristic of extra electrons. We find an interface concentration of Ti³⁺ that depends on growth conditions.

PACS: 73.61.Ng – Insulators / 73.20.-r – Electron states at surfaces and interfaces / 79.20.Uv – Electron energy loss spectroscopy

© EPLA, 2008

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