Dependence of irreversibility and vortex glass-liquid transition fields on electric field criterion in a superconducting Bi-2223 tape

摘要

It is known that the irreversibility field depends largely on the electric field criterion, E_c, for the determination of the critical current density. In addition, it was recently found that the vortex glass-liquid transition field determined by the scaling of current-voltage curves also depended on the range of electric field in the measurement. In this paper the two characteristic fields are measured for a Bi-2223 silver-sheathed tape as a function of the electric field. The obtained result of the irreversibility field is compared with the theoretical result of the flux creep-flow model. Based on the agreement with the theoretical model a standard test method of the irreversibility field is proposed.