Abstract
We report a combined high-temperature scanning tunneling microscopy, ion scattering spectroscopy, and photoelectron spectroscopy study of bare lanthanum aluminate [LaAlO3(LAO)] and of the initial stages of anatase TiO2 growth on LAO(001). LAO(001) exhibits mixed La–O and Al–O2 surface terminations at 400°C. Heteroepitaxial TiO2, grown by evaporating Ti metal in O2, nucleates near step edges, growing out to cover both upper and lower terraces uniformly, regardless of termination, indicating that the substrate cations and perovskite surface polarity play little direct role in controlling the morphology of this single-metal oxide heteroepitaxy. TiO2 films of 1.5nm in thickness exhibit a surface reconstruction similar to the bulk anatase (1×4).
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