Electron energy loss spectroscopy determination of Ti oxidation state at the (001) LaAlO3/SrTiO3 interface as a function of LaAlO3 growth conditions
- Maurice, Jean-Luc
- Herranz, Gervasi
- Colliex, Christian
- Devos, Isabelle
- Carrétéro, Cécile
- Barthelemy, Agnès
- Bouzehouane, Karim
- Fusil, Stéphane
- Imhoff, Dominique
- Jacquet, Éric
- Jomard, François
- Ballutaud, Dominique
- Basletic, Mario
DOIAbstract
6 pagesInternational audienceAt the (001) interface between the two band-insulators LaAlO3 and 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
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