A non-destructive characterization of silver sheathed 2223 BSCCO tapes by magnetization cycles in the temperature range (40 ≤ T ≤ 80 K) have been performed. From the amplitude of magnetization cycles, Δm(Hdc), different Jcfunctional have been calculated using the amplitude of critical current density Jcat T = 77 K, given by the manufactured company. Many physical considerations with the exponential intra-grain behaviour have been derived. These analyses for Hdc= 0 T show a clear collective pinning behaviour in the range studied. At low amplitude of the applied magnetic field, to explain higher Jcvalues from the exponential behaviour, the grain boundary effect as power-law in magnetic field with temperature dependence have been considered. At high amplitude of Hdcflux flow processes have been considered, but for high temperature also an "enhancement" thermally activated process must be taken into account to explain the shift to lower values from expected exponential behaviour. © 2002 Elsevier Science B.V. All rights reserved.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering