Abstract
Flux pinning and anomalous magnetization peak of heavily overdoped Bi2−xPbxSr2CaCu2−yCryO8+δ [Cr-doping (Bi, Pb)-2212] single crystals are investigated by means of magnetization measurements with the magnetic field parallel to the c axis. Compared with undoped Bi2Sr2CaCu2O8+δ (Bi-2212) and Pb-doping Bi2−xPbxSr2CaCu2O8+δ [(Bi, Pb)-2212] single crystals, the irreversibility line of Cr-doping (Bi, Pb)-2212 single crystals is pronouncedly shifted to high temperatures. The anomalous magnetization peak H2p with maximum peak field near 8000 G is observed. The H2p exhibits strong temperature dependence from 0.19 to 0.93Tc. The temperature dependence of H2p can be explained according to vortex decoupling theory. The improved flux pinning may originate from reduced anisotropy due to Pb doping and a sufficient number of effective pinning centers due to the random Cr substitution on the Cu site.
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