Preparation of Fibrous Bi(Pb)-Sr-Ca-Cu-O Crystals and Their Superconducting Properties in a Bending State

The superconducting fibrous crystals of Bi(Pb)-Sr-Ca-Cu-O (2212 phase) have been prepared by heating a glassy melt-quenched plate in an oxygen atmosphere. The crystals show Tc(onset) at 75 K and Tc(end) at 70 K. The fibers have a single crystal nature and can be bent to a radius of curvature (R) of 0.4 mm without a decrease in the Tc value. The highest Jc is 67000 A/cm2 (63 K, zero magnetic field) in a nonbending state. It surpasses 35000 A/cm2 even in a bending state of R>1 mm and finally decreases down to 3200 A/cm2 for R=0.4 mm.