Abstract
Magnetic properties of Te-doped Bi1.4Pb0.6Sr2Ca2Cu3TexOy superconductors were studied. The sample with x=0.05∼0.2 fired at 850°C for 50 h in air showed zero resistsnce above 100 K. The volume fraction of the superconducting phases was increased by the doping of Te and was maximum at x=0.1. By measuring the hysteresis loops at 77 K, it was observed that residual magnetization for the sample with x=0.1 was much larger than that with x=0. The critical current density for Te-doped sample was improved at high magnetic filed. These results suggest that the doping of Te was effective in increasing the pinning force. WDX analysis indicates that 0.6 at% Te was contained in high Tc phase.
