Abstract
We have investigated the magnetic properties of Ag-Cu alloy sheathed Bi-2223 tapes where Hf impurities are included in the pristine alloy We introduced columnar defects in the tapes parallel to the aligned c-axis (normal to the tape surface) by Xe-ion irradiation. We found that the irreversibility line in the heavy-ion irradiated tapes showed the shift toward higher fields. Moreover, the irreversibility curve of the irradiated sample is located in the higher temperature side of the irradiated Ag-sheathed tape (without Hf impurities in the tape) even in the higher magnetic field than the matching field. In addition, the improved irreversibility line is observed in the configuration of the field parallel to the tape (i.e., perpendicular to the columnar defects).
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