Influence of chemical doping on flux pinning of GdBa₂Cu₃O_7−z films

Abstract

Epitaxial GdBCO films with Cobalt (Co) and BaZrO 3 (BZO) doping were prepared on (00l) LaAlO 3 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 (J c ) 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 J c 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 J c -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.

Large critical current densities and pinning forces in CSD-grown superconducting GdBa2Cu3O7−x-BaHfO3nanocomposite films

“…In general, most of this work followed the well-known TFA-MOD-route [27]. This route has already shown promising properties for GdBCO films [17,[28][29][30][31][32][33], but still the effort is not comparable to YBCO and so there is room for improvement, as we will demonstrate in this work.…”

Importance of the pyrolysis for microstructure and superconducting properties of CSD-grown GdBa2Cu3O7−x-HfO2 nanocomposite films by the ex-situ approach

“…It is a scalable, versatile and low-cost technique that follows a chemical route for the growth of the films [18][19][20][21][22] and is thus suitable for the preparation of CCs. Very popular and thoroughly studied is the TFA-MOD route, which is a particular CSD technique leading to excellent superconducting properties in GdBCO films 12,[23][24][25][26][27][28][29][30][31] .…”