Abstract
We evaluated the microstructure, superconducting, and flux pinning properties of La‐doped (Bi,Pb)‐2212 bulk sample by varying its sintering temperature (Tsinter) between 846° and 860°C. Significant variations in microstructure, self‐ and in‐field JCs at 64 K and flux pinning properties have been observed for La‐substituted samples with respect to Tsinter. The sample sintered at 858°C shows best self‐field JC while that sintered at 846°C shows the best in‐field JC due to the changes in microstructure. The activation energy of flux motion (pinning potential Uo) is estimated from the field dependent resistivity–temperature curves, and the flux pinning force (FP) from the field‐dependent JC values. It is found that the La‐doped samples, sintered at 846°C show maximum FP and Uo of 463 kN/m3 and 0.380±0.001 eV as against 93.6 k/Nm3 and 0.140±0.001 eV, respectively, for the sample sintered at 858°C. The undoped (Bi,Pb)‐2212 shows a maximum FP and Uo of 12.7 k/Nm3 and 0.074±0.001 eV, respectively. The origin of these enhanced properties is mainly from the normal‐like defects introduced by optimum La‐doping at the Sr‐site, at an optimum sintering temperature.
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