抄録
(Bi,Pb)2Sr2Ca2Cu3Oy ((Bi,Pb)2333) has high critical temperature (Tc) compared to REBa2Cu3Oy. However, (Bi,Pb)2223 tape has low critical current density (Jc) because of in-plane orientation. In addition, (Bi,Pb)2223 has a disadvantage that the Jc seriously degrades in magnetic fields. We succeeded to fabricate (Bi,Pb)2223 epitaxial thin films by pulsed laser deposition (PLD) method and post-annealing process. In addition, we tried to introduce artificial pinning center (APC) by heavy-ion irradiation to improve Jc in the magnetic field. As a result, we fabricated (Bi,Pb)2223 thin films that had high Jc in self field at 77 K of 0.4 MA/cm2. The Jc in the magnetic field of (Bi,Pb)2223 thin films after heavy-ion irradiation improved. Jc in the matching magnetic field (Bϕ) improved 20 times of (Bi,Pb)2223 before heavy-ion irradiation.
