Abstract
The magnetic properties of polycrystalline Bi 2−xT xSr 2CaCu 2O 8+y (T = Pb, Nb) have been investigated. It is found that flux pinning in Pb0.3 and Pb0.4 has been improved over Bi2212. However, Pb0.2 and Nb0.2 samples show rather weak flux pinning. The irreversibility temperature (T irr) scale with extrinsic property such as flux pinning and not with T c.
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