Unusual Fluorination Effects on Superconducting Films
In this paper we extend our previous fluorination work presenting an unusual fluorination effect in growing device quality superconducting film directly on sapphire. The superiority of the film quality is attributed to the fact that fluorine plays a significant role in the control of nucleation and in the enhancement of the growth rate of the superconducting film in the basal plane, therefore, an “epitaxial” film is obtained. Furthermore, the high quality fluorinated film can be grown at a lower temperature. As a result, the grain boundary weak link effect and the interface diffusion between the superconducting film and the substrate are minimized. The superconducting film with a high critical current density and a very smooth surface is achieved. With our technique, we believe that device quality superconducting film could be grown not only on sapphire but on other flexible inexpensive continuous substrates for high field applications which could lead to a major technological advancement.
KeywordsCritical Current Density Laser Ablation System High Critical Current Density High Field Application YBaCuO Film
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