Peak effect and Bose-glass transition of the heavy-ion irradiated Bi2212: Effect of the defect configuration

Abstract

Bi 2Sr 2CaCu 2O 8+ δ single crystals were irradiated with 5.8 GeV Pb-ions to introduce columnar defects (CD). The orientation of the defect structure was altered by changing the direction of incident beam. The peak effect was observed in the sample with CD|| c-axis|| B a, and it smeared gradually as CD was tilted away from the field direction. The irreversibility field H irr was scaled with the effective defect density, except for the region where the “recoupling” transition occurs.