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ABSTRACT
Epitaxial GdBCO films with Cobalt (Co) and BaZrO3 (BZO) doping were prepared on (00l) LaAlO3 substrate by a self-developed fluorine-free polymer-assisted metal-organic deposition (FF-PA-MOD) approach. The effect of different doping ways on structure and properties of GdBCO films was investigated. Our results show that in-field critical current density (Jc) values of doped films have been distinctly improved compared to the pure film. It is noted that Co-doped film has much larger in-field Jc values than BZO-doped film, especially at higher temperatures. Furthermore, Co-doped GdBCO film shows significantly enhanced surface smoothness and grain connectivity. It is suggested that obviously enhanced Jc–B properties of the film may be attributed to improved surface morphologies and effective flux pinning centres by dilute Co doping. This study may offer another simple and efficient way to obtain the GdBCO-based coated conductors with high current densities.
Acknowledgements
The authors are grateful for the financial support of the National Science Foundation of China under grant no. 51102199 and 51072168; the National Magnetic Confinement Fusion Science Program under grant no. 2013GB110001; the Program of International S&T Cooperation under grant no. 2013DFA51050 and the 863 Program under grant no. 2014AA032701.
Disclosure statement
No potential conflict of interest was reported by the authors.