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Vacancy defect and carrier distributions in the high mobility electron gas formed at ion-irradiated SrTiO3 surfaces

Using a combination of advanced characterization tools (positron annihilation spectroscopy, conductive-tip atomic force microscopy and high-field magnetotransport), we have studied the extension, origin and properties of the high mobility electron gas (HMEG) generated by etching the SrTiO3 surfaces with Ar+ ions. Contrary to previous assumptions, we show that this HMEG is not confined to nanometric thickness, but extends to a few μ m from the surface. We discuss this unanticipated large spatial extension in terms of the striking large diffusion of oxygen vacancy-related defects.

positron annihilation; vacancies; ion radiation effects; magnetotransport

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