Abstract
The irreversibility lines of silver-sheathed (Bi,Pb) 2Sr 2Ca 2Cu 3O 10 (Bi-2223), (Tl,Pb,Bi)(Sr,Ba) 2Ca 2Cu 3O 9 (Tl-1223) and (Tl,Pb)Sr 2Ca 3Cu 4O 11 (Tl-1234) superconducting tapes were investigated and compared with those of other superconducting systems. We have demonstrated that the shape of the irreversibility lines of Tl-1223 and Tl-1234 superconducting tapes are similar in behavior to those of YBa 2Cu 3O 7 (Y-123) and (Tl,Pb)Sr 2(Ca,Y)Cu 2O 7 (Tl-1212) systems and better than those of Tl 2Ba 2Ca 2Cu 3O 10 (Tl-2223) and (Bi,Pb) 2Sr 2Ca 2Cu 3O 10 (Bi-2223) superconductors. This means that the flux pinning ability of Tl-1223 and Tl-1234 superconducting tapes was stronger than that of Bi-2223 and Tl-2223 superconductors. The possible reason for controlling flux pinning can be attributed to the intrinsic crystal structure difference in the materials.
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