Isotropic Magnetic Field Angular Dependence of Critical Current of
Nanoparticles Dispersed
Y_1-xRE_xBa₂Cu₃O_y Coated Conductors

Masashi Miura, Masateru Yoshizumi, Yutaka Yamada,
Teruo Izumi, Yuh Shiohara, Takeharu Kato, Tsukasa Hirayama

Abstract — In order to enhance the J_c characteristics under the magnetic fields, we prepared Y_1-xRE_xBa₂Cu₃O_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, BaZrO₃ (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^s.f.) of 4 MA/cm² and its minimum value of 0.64 MA/cm² at 77 K and 1 T. Moreover, using a growth rate control technique for YGdBCO+BZO films, we have achieved the extremely high J_c^s.f. value on a metal substrate of 4.0 MA/cm² at 77 K for a 1.9 µm thick film, the I_c value was 760 A/cm-width.

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