Fabrication of Magnetic Shielding with High-Tc Superconducting Films

Abstract

A superconducting tube has been developed for a magnetic shielding. This tube was composed of 22 pieces of Bi(Pb)-Sr-Ca-Cu-O ring disks prepared by a doctor blade method. As the magnetic field was applied parallel to the axis of the tube, the magnetic flux density was shielded up to 21 gauss by the tube. Then, the decay of the trapped magnetic flux density for the tube showed logarithmic dependence in time. The activation energy estimated from Anderson's flux creep model was about 0.3eV.