Nonlinear pressure dependence of the transport critical current density in BSCCO- 2223 tapes

Abstract

The transport critical current density (J c) in Bi-2223 tapes with J c(77K) ∼ 10 4 A/cm 2 was studied under hydrostatic pressure up to 14 kbar. The pressure dependence of the critical current density in Bi-2223 tapes is qualitatively different from that in YBCO ceramics and thin films. In Bi-2223 tapes J c increases in the initial pressure range with pressure derivatives d(In J c)/dP in the range 0.06–0.1 kbar −1. At P ∼8–12 kbar J c(P) turns to saturation, while the superconducting transition temperature increases linearly under pressure with dT c/dP ∼ 0.16–19 K/kbar in the entire v pressure range.