Dependence of critical current properties on growth temperature and doping level of nanorods in PLD-YBa2Cu3Oy films

• We fabricated Y123 films with Ba–Nb–O nanorods at various growth temperatures.
• Irreversibility lines depended on growth temperature and doping level of Ba–Nb–O.
• Nanorod morphology was drastically changed by growth temperature (Ts).
• Its Ts dependence of the matching field was different from that for Er123 + Ba–Nb–O.

The vortex-Bose-glass-like irreversibility lines (ILs) emerged for 2.5 and 5.0 at.% Ba–Nb–O (BNO)-doped YBa2Cu3Oy films deposited by PLD using Nd:YAG-laser. The ILs strongly depended on growth temperature (Ts) in addition to the doping level of BNO. The vortex glass region was expanded with increasing Ts or doping level of BNO. Drastic change of the nanorod morphology from short and bended nanorods to long and linear nanorods with increasing Ts was clarified. Moreover, it was found that Ts-dependent ILs were quite different from our previous results in BNO-doped ErBa2Cu3Oy films.