Abstract
Magnetization measurements have been performed on Bi(Pb)2212 single crystals with various electromagnetic anisotropies $({\ensuremath{\gamma}}^{2}=1.2\ifmmode\times\else\texttimes\fi{}{10}^{3}\ensuremath{\sim}4.4\ifmmode\times\else\texttimes\fi{}{10}^{4})$ before and after introducing columnar defects by Ta ion irradiation. The irreversibility fields of these crystals increased systematically with decreasing ${\ensuremath{\gamma}}^{2}$ at various reduced temperatures ${t=T/T}_{\mathrm{c}},$ indicating that the smaller anisotropy makes the columnar defects substantially more effective in flux pinning. The record-high irreversibility field and critical current density for single crystals of the Bi2212 phase was observed in our oxygen-overdoped Bi(Pb)2212 with columnar defects. This study experimentally reveals the reduction of the electromagnetic anisotropy and the introduction of pinning centers work cooperatively in high-${T}_{c}$ superconductor compounds.
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