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Ti- and Sr-rich surfaces of SrTiO3 studied by grazing incidence x-ray diffraction

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8 Author(s)
Fragneto, A. ; CNR-INFM Coherentia, Complesso Monte S. Angelo, via Cinthia, 80126 Napoli, Italy ; De Luca, G.M. ; Di Capua, R. ; Scotti di Uccio, U.
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The structure of SrTiO3 (100) (STO) single crystal surfaces has been investigated by grazing incidence x-ray diffraction. The authors found that chemically etched STO is composed ∼75% of an ideal TiO2 surface layer and ∼25% of SrO and it is very stable when annealed in ultrahigh vacuum or in O2 at high temperatures. A monolayer of SrO, epitaxially grown by pulsed laser deposition, is found to cover only a fraction of the TiO2 layers and exhibits a 2×2 reconstruction with strong structural changes after annealing in conditions typically used for the deposition of oxides.

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Applied Physics Letters  (Volume:91 ,  Issue: 10 )