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Title
Japanese: 
English:Pulsed-laser deposition of superconducting LiTi2O4 ultrathin films 
Author
Japanese: 大島 孝仁, 丹羽 三冬, 横山 耕祐, 大友 明.  
English: T. Oshima, M. Niwa, K. Yokoyama, A. Ohtomo.  
Language English 
Journal/Book name
Japanese: 
English:Journal of Crystal Growth 
Volume, Number, Page Volume 419        Page 153-157
Published date Mar. 29, 2015 
Publisher
Japanese: 
English:Elsevier 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
DOI https://doi.org/10.1016/j.jcrysgro.2015.03.029
Abstract We report epitaxial growth, structural characterizations and thickness-dependent superconducting properties of LiTi2O4 films grown on (111) MgAl2O4 substrates by using pulsed-laser deposition. The variations of growth temperature (Tg) and excess Li composition of target materials were found to be crucial for improving the crystallinity, as verified by X-ray diffraction rocking curve and the in-plane domain configuration. The crystallinity of the desired LiTi2O4 phase improved with increasing Tg, whereas the inclusion of Li-deficient phases became more significant due to high sublimation rate of Li species. The use of the excess Li targets allowed us to elevate Tg up to 750 °C (Li/Ti=1.0) with keeping high crystallinity and phase purity. For films grown under the best condition, the superconducting transition was observed near 12 K even when thickness was as thin as 9 nm.

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