Investigation of Self- and In-field Dependent n-value of Tb-doped (Bi,Pb) - 2212 Superconductor

Abstract

Knowledge of the electric field versus current density (E-J)(E-J)characteristics is very important for the development of superconducting high-field magnets particularly for operation in the persistent mode. A systematic study of the E-JE-Jcharacteristics and the associated nn-indices has been carried out both in self and applied fields in respect of Tb-doped (Bi,Pb)-2212, a promising superconductor for high-field application. The results on nn-indices and pinning energy (Uc)(Uc) show that the flux-lines in (Bi,Pb)-2212 doped with an optimum concentration of Tb (x=0.075–0.100)(x=0.075–0.100) are in glass-state and hence the material allows maximum current to flow with minimum dissipation of energy. Further, it has been shown that the modified material is a promising candidate for persistent mode superconducting magnets.