Rare Earth Substitution Effects and Magnetic Field Dependence of Critical Current in Y1-xRExBa₂Cu₃OyCoated Conductors with Nanoparticles (RE=Sm, Gd)

In order to enhance the J c characteristics under the magnetic fields, we prepared Y 1- x RE x Ba 2 Cu 3 O y coated conductors (CCs) with artificial pinning centers by using the starting solution containing Zr-salt, where RE is Gd or Sm, in the trifluoroacetates-metal organic deposition. From microstructure observation, BaZrO 3 (BZO) nanoparticles were uniformly dispersed in these films. High J c in the magnetic fields and significant enhancement of J c for all applied magnetic field angles were achieved. Especially, YGdBCO+BZO CCs showed the highest self-fields J c values ( J c sf ) of 4 MA/cm 2 and its minimum value of 0.64 MA/cm 2 at 77 K and 1 T.