Abstract
We discuss the recent proposal by Klie et al. [Phys. Rev. B 68, 214101 (2003)] that a Thomas-Fermi screening model provides a better description of grain-boundary potentials in acceptor-doped $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ than the established double-Schottky-barrier model. We point out several inconsistencies between the model predictions and experimental observations.
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