Heavy-ion irradiation effects in Ag-Cu alloy sheathed Bi-2223 tapes

We have investigated the magnetic properties of Ag-Cu alloy sheathed Bi-222 3 tapes with columnar defects parallel to the c-axis introduced by Xe-ion i rradiation. We found that the irreversibility line in heavy-ion irradiated Bi-2223 tapes showed the shift toward higher fields. In addition, the irrev ersibility curve of the irradiated Ag-Cu alloy sample is located in the hig her temperature side of the irradiated Ag sheathed tape even in the higher magnetic field than the matching field. (C) 2000 Elsevier Science B.V. All rights reserved.