超伝導体-常伝導金属複合材料のフラックスピンニングと臨界電流

抄録

Composites having a very fine dispersion of Ag in a Bi₂Sr₂Ca₂Cu₃O_10-δ matrix have been studied in order to provide a very robust conductor suitable for magnets. Conductors have a rather modest critical current density of 20, 000A/cm² at 4.2K, zero magnetic field and zero bending strain but they degrade much less under bending strain having 3000A/cm² at 20K, 20T for H perpendicular to the a-b plane and under 0.7% bending strain. The samples have typically had solder leads attached and removed a half dozen times, have been bent around different bending blocks, and have been quenched into liquid nitrogen, liquid helium, or liquid hydrogen many times before the measurements are made. These are very robust conductors.