Abstract
The peak effect in heavily Pb-doped Bi 2Sr 2CaCu 2O 8+ δ single crystals was studied by measuring the magnetisation hysteresis ( M– H) loop. In contrast to the weak peak effect in pure single crystals, the Pb-doped crystals showed a very strong peak effect in a very wide temperature range, from 20 K up to T c. The peak field, H peak, was as high as 0.4 T. The effect of annealing on the peak effect was also studied. Oxygen overdoping enhances the peak effect more than the underdoping. A comparison study of the peak effect was done for pure, Pb-doped Bi2212 crystals and Y123 samples. A novel method was used to characterise the peak effect. Results showed that the peak effect in the Pb-doped Bi2212 is even stronger than in Y123.
Published Version
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