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Schematic illustration of TiO6 octahedra in cubic SrTiO3 and orthorhombic CaTiO3. Octahedral rotations in CaTiO3 are highlighted by the Ti-O-Ti angle lower than 180°.
(a) 20 μm × 20 μm AFM image of a LaAlO3 (5 nm)/CaTiO3 (10 nm)/SrTiO3 structure. (b) Out-of-plane θ-2θ scans of LaAlO3 (5 nm)/SrTiO3 (50 nm)/SrTiO3, LaAlO3 (5 nm)/Sr0.5Ca0.5TiO3 (50 nm)/SrTiO3, and LaAlO3 (5 nm)/CaTiO3 (25 nm)/SrTiO3 structures. The arrow indicates the peak position of bulk (002) p CaTiO3. (c) (101) in-plane phi scan of the LaAlO3 (5 nm)/CaTiO3 (25 nm)/SrTiO3 structure.
(a) HRTEM image of a LaAlO3/CaTiO3/SrTiO3 structure. The inset is the FFT diffraction patterns from the CaTiO3 layer. (b) and (c) HRTEM images of LaAlO3/CaTiO3 and CaTiO3/SrTiO3 interfaces showing the sharp interface indicated by red arrows. (d)SAED pattern of the LaAlO3/CaTiO3/SrTiO3 structure. (e) and (f) HRTEM images and SAED pattern of a LaAlO3/Sr0.5Ca0.5TiO3/SrTiO3 structure.
(a) Typical I-V curves of LaAlO3 (5 nm)/SrxCa1−xTiO3 (10 nm)/SrTiO3 structures. For comparison, I-V curves of LaAlO3/SrTiO3 and bulk SrTiO3 are presented. (b) Current at 5 V and sheet conductance of the LaAlO3/SrxCa1−xTiO3/SrTiO3 structures as a function of Sr content.
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