Dissipative Flux Motion and Flux Flow Resistivity Analysis in LaaDoped (Bi, Pb)a2212 Superconducting Ceramics

The dissipation below Tc and the thermally activated energy are analyzed in detail for La-doped (Bi, Pb)-2212 superconductor as a typical case with two analytical methods. The first one is a conventional and generally used Arrhenius method, and the second, a consistent description of vortex glass theory. In the second method, a modified vortex glass correlation length is introduced to give the consistent description of the field and temperature dependence of the resistivity in the vortex liquid regime and this method takes into account both thermal energy kBT and the characteristic mean pinning energy U0(B, T) for the analysis of the resistivity data. The results are parameterized in the frame work of flux flow, and the largest activation energy is obtained for the optimally doped (Bi, Pb)-2212. The scaling behavior between the normalized resistivity, rho (B, T)/ rho n, and the scaled temperature, T(Tc-Tg)/Tg(Tc-T)-1, in the regime of Tg