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(a) HAADF-STEM overview image of the sample. The surface structure of the PbTiO3 film and the SrRuO3 nanowires of ∼5 × 120 nm size is distinct. (b) Colored elemental map with Ti (blue), Ru (light-blue), and Sc (red). (c) Magnified image of a nanowire ending showing the a and c domains in the PbTiO3 film. Domain walls in the film (white dashed-lines) occur (mostly) at the end of the nanowires. The horizontal dashed-line indicates the bending of an atomic plane through ac-domains.
(a) High resolution HAADF-STEM image taken shows two dark bands in both PbTiO3/SrRuO3 and SrRuO3/DyScO3 interfaces indicated by arrows. (b) Line profiles across a SrRuO3 nanowire indicate the atomic sequence in both interfaces (regions 1 and 2) with alternating Pb-Sr-Dy (blue) and Ti-Ru-Sc (red). Line profiles in a region without nanowire (regions 3) show alternating Pb-Dy (blue) and Ti-Sc (red). The insets 1, 2, and 3 in (a) indicate the simulated images.
((a), (b)-left) Elemental maps of Dy-L2,3, Sc-L2,3, Ru-M4,5, and Ti-L2,3 edges (gray scaled) together with the corresponding color map with Dy (green), Sc (red), Ru (light-blue), and Ti (blue) from (a) region 1, 2 and (b) region 3. (c) Atomic elemental line profiles with Dy (green), Sc (red), Ru (light-blue), Sr (pink), and Ti (blue) crossing the interfaces.
EELS spectra of Ti-L2,3, Sc-L2,3, and O K edges across the SrRuO3 nanowire. Subtle changes are observed as a result of an electronic-structure reconstruction at the PbTiO3/SrRuO3 and SrRuO3/DyScO3 interfaces.
3D model of the growth system: (a) Perovskite building blocks of DyScO3, SrRuO3, PbTiO3, and SrTiO3. AO and BO2 layers are shown in a distinct color. (b) SrRuO3 grows preferentially on Sc-terminated DyScO3 substrate steps. (c) Epitaxial growth of the PbTiO3 film inducing an unexpected 3 unit cells of SrTiO3.
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