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. 2014 Jun 2;5:3990. doi: 10.1038/ncomms4990

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Shown are the SIMS depth profiles of Pt⁻, SrO⁻, O⁻ and C⁻ for all samples. For samples B, C and D, a carbon peak is detected at the Pt/Nb:SrTiO₃ interface.