ScholarWorks@성균관대학교

초록

Ordered corundum oxides introduce new prospects in the field of functional oxides thin films, complementing the more widely studied class of ABO3 perovskites. In this work, we take advantage of the layer-by-layer growth regime to fabricate epitaxial CrVO3 superlattice thin films with atomic-scale accuracy on the periodic arrangement of chromium and vanadium layers. By means of X-ray diffraction, scanning transmission electron microscopy and Raman spectroscopy, we confirm the thickness control in the sub-unit cell scale, alternating 3, 2 or 1 single atomic layers of Cr2O3 and V2O3. We stabilize the ilmenite phase of CrVO3 (space group R3¯) and compare the functional properties of the thin film with those calculated by density functional theory. This approach to the growth of ordered corundum oxides opens the path towards the stabilization of complex oxides with tailored properties by varying the composition and the superlattice period, ultimately broadening the family of functional rhombohedral oxides.

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