Controlling interface intermixing and properties of SrTiO3-based superlattices

Teruyasu Mizoguchi, Hiromichi Ohta, Hak Sung Lee, Nobuaki Takahashi, Yuichi Ikuhara

    Research output: Contribution to journalArticlepeer-review

    20 Citations (Scopus)

    Abstract

    By combining state-of-the-art microscopy, spectrosccopy, and first-principles calculations, atomic-scale intermixing behavior at heterointerfaces in SrTiO3-based superlattices is investigated. It is found that Nb is confined to a unit-cell thickness without intermixing, whereas Ba diffuses only to the adjoining Nb-doped SrTiO3 layer. It is revealed that the intermixing behaviors at the heterointerfaces are determined by not only the migration energy, but also by the vacancy-formation energy and the Fermi energy of each layer. Based on these results, we find a method to control the atomic-scale intermixing at the nonpolar heterointerfaces and clearly demonstrate the property improvements obtained by constructing an abrupt heterointerface.

    Original languageEnglish
    Pages (from-to)2258-2263
    Number of pages6
    JournalAdvanced Functional Materials
    Volume21
    Issue number12
    DOIs
    Publication statusPublished - 2011 Jun 21

    Keywords

    • electronic structures/ processes/mechanisms
    • nanostructures
    • structure-property relationships
    • thin films

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics

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