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Wu, Kuan Ting
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article
Heteroepitaxial Hexagonal (00.1) CuFeO2 Thin Film Grown on Cubic (001) SrTiO3 Substrate Through Translational and Rotational Domain Matching
Abstract
<p>Heteroepitaxy of complex oxide thin films is a significant challenge when a large mismatch in the lattice parameters (>8%) and difference in the crystallographic symmetry coexist between the film and substrate. Herein, the heteroepitaxial growth of a hexagonal delafossite CuFeO<sub>2</sub> thin film with (00.1) orientation on a cubic perovskite (001) SrTiO<sub>3</sub> substrate through translational and rotational domain matching epitaxy is reported. The rotational in-plane domain orientation relationships are CuFeO<sub>2</sub> [11.0]//SrTiO<sub>3</sub> [110] and CuFeO<sub>2</sub> [2 (Formula presented.).0]//SrTiO<sub>3</sub> [110] with about 10% in-plane lattice mismatch. The 14.8 nm-thick (00.1) CuFeO<sub>2</sub> thin film shows high-crystalline quality with a full width at half maximum of rocking curve of about 0.24° and exhibits a possible indirect optical bandgap of 1.43 eV or direct optical bandgap of 1.94 eV. Herein, not only a model system demonstrating translational and rotational domain matching heteroepitaxy of complex oxides is reported, but also a way to thin-film heterostructures integrating hexagonal delafossite with cubic perovskite materials for functional oxide devices is opened.</p>