Epitaxial growth process of La0.7Ca0.3MnO3 thin films on SrTiO3(001): Thickness-dependent inhomogeneity caused by excess Ti atoms

Ryota Shimizu, Takeo Ohsawa, Katsuya Iwaya, Susumu Shiraki, Taro Hitosugi

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    We report on the thickness-dependent incorporation of excess Ti atoms into La0.7Ca0.3MnO3 thin films epitaxially grown on SrTiO3(001) substrates. Using the atomically defined SrTiO 3(001)-(√13 × √13)-R33.7° substrate, the topmost surface of which is covered with excess TiO2 layer, we atomically image a gradual transition of the surface structures from (√13 × √13)-R33.7° to pseudocubic (1 × 1) periodicities, as the film thickness is increased. Our results indicate that the initial excess Ti cations on the substrate surface are dispersed into the film, and displace Mn atoms onto the MnO2-terminated film surface. Furthermore, the excess cations prefer segregation onto the film surface rather than uniform distribution inside the film. These findings indicate that more attention should be paid to the influence of the substrate surface on the film stoichiometry, and its implications for the physical properties of thin manganite films.

    Original languageEnglish
    Pages (from-to)1555-1560
    Number of pages6
    JournalCrystal Growth and Design
    Volume14
    Issue number4
    DOIs
    Publication statusPublished - 2014 Apr 2

    ASJC Scopus subject areas

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

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