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At the (001) interface between the two band-insulators LaAlO3 and SrTiO3, ahigh-mobility electron gas may appear, which has been the object of numerousworks over the last four years. Its origin is a subject of debate between theinterface polarity and unintended doping. Here we use electron energy loss'spectrum images', recorded in cross-section in a scanning transmissionelectron microscope, to analyse the Ti3+ ratio, characteristic of extraelectrons. We find an interface concentration of Ti3+ that depends on growthconditions.

Electron energy loss spectroscopy determination of Ti oxidation state at the (001) LaAlO3/SrTiO3 interface as a function of LaAlO3 growth conditions