Bi-BASED SUPERCONDUCTING FIBERS WITH HIGH CRITICAL PARAMETERS

Superconducting fibers of Bi(Pb)-Sr-Ca-Cu-O high Tc superconducting materials have been prepared by means of the laser-heated pedestal growth (LHPG) method. The highest zero resistance temperature T c0 reached is 114 K, and the highest critical current density J c (77 K, 0 T) is greater than 5000 A/cm 2 . As-grown superconducting fibers were successfully fabricated without post-growth heat treatment. Amorphous materials were used for the first time to make high quality fibers. The influence of growth conditions, thermal treatment and the composition of the fibers were discussed.