Magnetic Shielding Analysis of Oxide Superconducting Rectangular Plates

Abstract

The magnetic shielding analysis of oxide superconducting plates must consider a condition of the plates to be in a mixed state of superconductivity. In this paper, the magnetic shielding characteristic is analyzed by using the shielding current flowing within a superconductor. In this analysis, the shielding current is limited by the critical current density obtained by the four-probe electrical resistance method or the susceptibility method to consider the mixed state. The results of magnetic shielding experiments agree approximately with the analysis results, when the shielding current is limited by the susceptibility method. When the shielding current is limited by the four-probe electrical resistance method, on the other hand, the superconducting plates shield the magnetic field core effectively in the analysis than observed in shielding experiments.