Enhancement of critical current density of (Pb,Sn)-doped Bi-2212 superconductors at high temperature

Y. Li, S. Kaviraj, A. Berenov, G.K. Perkins, J. Driscoll, A.D. Caplin, G.H. Cao, Q.Z. Ma, B. Wang, L. Wei, Z.X. Zhao

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44 Citations (Scopus)


The magnetic properties of ceramic samples of Bi(PbSn)SrCaCu O (x = 0,0.1,0.2,0.3 and 0.4) superconductors have been investigated using a vibrating sample magnetometer from 20 to 50 K and up to 8 T. Phase analysis shows that most of the (Pb,Sn) dopant enters the Bi-2212 lattice and occupies Bi sites. The current-carrying scale-length analysis has been determined from the reverse leg of the magnetization hysteresis loops and compared to the actual dimensions of the sample. Magnetization hysteresis loops of the (PbSn)-doped sample exhibit strong pinning behaviour in the higher temperature range. The effect of (Pb,Sn) doping on intragranular critical current J was found to be enhanced by one order of magnitude at 50 K. We discuss the experimental results within a model of (PbSn) cluster pinning in blocking layers. Doping by (PbSn) clusters into the Bi-O layers provides effective pinning centres, as well as a large reduction of the resistivity anisotropy.
Original languageEnglish
Pages (from-to)51-58
Number of pages8
JournalPhysica C: Superconductivity and its Applications
Issue number1-2
Publication statusPublished - Jun 2001


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