Friday, 2D-07, 4:10-4:20

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

Masashi Miura

Takeharu Kato³, Masateru Yoshizumi¹, Yutaka Yamada¹, Teruo Izumi¹, Tsukasa Hirayama³, and Yuh Shiohara¹

¹ Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13, Shinonome Koto-ku, Tokyo 135-0062, Japan +81-3-3536-5711; fax:+81-3-3536-5717; e-mail: m_miura@istec.or.jp
² Japan Society for the Promotion of Science, 8 Ichibancho, Chiyoda-ku, Tokyo 102-8472, Japan
³ Materials R&D Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atuta-ku, Nagoya 456-8587, Japan

In order to enhance the critical current density (J_c) under the magnetic fields, we prepared Y1-xRExBa2Cu3Oy (RE: Gd, Sm) coated conductors (CCs) with artificial pinning centers by the trifluoroacetates (TFA)-metal organic deposition (MOD) of the Ba-poor (deficient from the stoichiomtric ratio) starting solution containing Zr. According to microstructural observation, BaZrO₃ (BZO) nanoparticles were uniformity dispersed in the film. High J_c values in the magnetic fields and isotropic magnetic field angular dependence of J_c for YSmBCO+BZO and YGdBCO+BZO CCs were realized since BZO nanoparticles pin the fluxons of all applied magnetic field orientations. Especially, YGdBCO+BZO CCs showed the highest self-field J_c (J_c^s.f.) =4 MA/cm² and J_c,min=0.64 MA/cm² at 77K and 1 T, which were 3.36 times higher than these of YBCO CCs. Moreover, the YGdBCO+BZO CCs using a growth rate controlled process showed a high I_c^s.f. value of 760 A/cm-w for 1.9 μm thick film. Additionally, this film revealed extremely high superconducting performance of I_c,min=115 A/cm-w under 1T and 35 A/cm-w under 3T at 77 K.

This work was supported by the NEDO as Collaborative Research and Development project of Fundamental Technologies for Superconductivity Applications and the project of Development of Material & Power application of Coated Conductors, M-PACC. Part of this work was supported by the Japan Society for the Promotion of Science KAKENHI (20-4011).

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