TY - JOUR
T1 - Enhancement of critical current density of (Pb,Sn)-doped Bi-2212 superconductors at high temperature
AU - Li, Y.
AU - Kaviraj, S.
AU - Berenov, A.
AU - Perkins, G.K.
AU - Driscoll, J.
AU - Caplin, A.D.
AU - Cao, G.H.
AU - Ma, Q.Z.
AU - Wang, B.
AU - Wei, L.
AU - Zhao, Z.X.
PY - 2001/6
Y1 - 2001/6
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0035367179&partnerID=8YFLogxK
U2 - 10.1016/S0921-4534(00)01770-6
DO - 10.1016/S0921-4534(00)01770-6
M3 - Article
AN - SCOPUS:0035367179
SN - 0921-4534
VL - 355
SP - 51
EP - 58
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1-2
ER -