fig5

Figure 5. (A) Schematic of the four “rotational” domains (RX, RY, RX’, and RY’) in the tetragonal variant of SrRuO₃, where octahedra within the lattice rotate around the [001] axis by 0°, 90°, 180°, or 270°; (B) Tendency of the SrRuO₃ to align the in-phase (+) rotation axis with that of GdScO₃ during growth. This figure is quoted with permission^[70]; (C) Structure of monoclinic SrIrO₃; (D) HAADF-STEM image of a 3-bilayer SrIrO₃ film capped with five bilayers of SrTiO₃; (E) FFT diffraction pattern indicating consistency of the SrTiO₃/SrIrO₃ heterostructure with the underlying SrTiO₃ substrate. This figure is quoted with permission^[71]; (F) XRD 2θ-θ scan of SR heterostructures; (G) Cross-sectional HAADF image of B-SRO (20 nm); (H) Pseudocubic atomic model of SRO and LCO crystals; (I) Octahedral rotations between SRO and LCO represented using Glazer notation. This figure is quoted with permission^[72]. HAADF-STEM: High-angle annular dark-field scanning transmission electron microscopy; FFT: fast Fourier transform; XRD: X-ray diffraction; SRO: SrRuO₃; LCO: LaCoO₃.