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The topographic and electronic structure of cleaved SrTiO3(001) surfaces werestudied, employing samples that either had or had not been coated with Ti ontheir outer surfaces prior to fracture. In both cases, SrO- and TiO2-terminatedterraces were present on the cleavage surface, enabling in situ studies oneither termination. However, the samples coated with Ti prior to fracture werefound to yield a rougher morphology on TiO2-terminated terraces as well as ahigher density of oxygen vacancies during an annealing (outgassing) stepfollowing the coating. The higher density of oxygen vacancies in the bulk ofthe Ti-coated samples also provides higher conductivity which, in turn,improves a sensitivity of the spectroscopy and reduces the effect oftip-induced band bending. Nonetheless, similar spectral features, unique toeach termination, were observed for samples both with and without the Ticoating. Notably, with moderate-temperature annealing following fracture, astrong discrete peak in the conductance spectra, arising from oxygen vacancies,was observed on the SrO-terminated terraces. This peak appears at slightlydifferent voltages for coated and uncoated samples, signifying a possibleeffect of tip-induced band bending.

Topographic and electronic structure of cleaved SrTiO3(001) surfaces