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Horiba, Koji
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article
Highly oriented epitaxial CaFe<sub>2</sub>O<sub>4</sub> thin films on TiO<sub>2</sub> substrates grown by pulsed-laser deposition
Abstract
CaFe2O4 (CFO) is an oxide semiconductor being usable for a photocathode, but its single crystal is so far grown only by a high-pressure bulk synthesis method. Using pulsed-laser deposition, we have obtained the (010)-oriented CFO films on TiO2 (100) substrates. The epitaxial structure included twin domains with 1.5° tilting fromthe surface normal and sixfold domainswith in-plane rotations of±70° with respect to the b axis of TiO2,whichwas explained by taking a number of probable arrangements between FeO6 and TiO6 octahedra into account. X-ray absorption spectroscopy and ultra-violet-visible-near-infrared spectroscopy measurements revealed the electronic properties similar to those of bulk and thus the CFO films would be suitable to the investigation of photocathodic performance.