Abstract
The effect of Zr and Sn addition on the critical current density (Jc) and the microstructure of filamentary SmBa2Cu3Oy (Sm123) has been investigated. Samples with additions fabricated by a solution spinning method were partially melted under an atmosphere gas containing 0.1-3.0% O2. After heat-treatment, homogeneous dispersion of fine Sm2BaCuO5 (Sm211) particles was observed in the Zr-doped sample. The 0.2 at% Zr-doped Sm123 showed the depressed Jc value of 1.8 × 104 at 77 K and self-field compared with the undoped sample. From the Jc measurement in magnetic fields, Jc value higher than 103 A/cm2 at 77 K was maintained up to 8 T. On the other hand, 0.2 at% Sn-added sample showed high Jc value of 5.0 × 104 A/cm2 at 77 K and self-field, and the Jc value higher than 103 A/cm2 is maintained up to 17 T. A small amount of Sn doping was found to be effective in increasing the Jc under high magnetic field and the irreversibility field of Sm123 filaments.
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