Title :
Magnetic flux distribution in polycrystalline Bi,Pb-Sr-Ca-Cu-O superconductors in a cyclic state
Author :
Paasi, J. ; Polak, M. ; Lahtinen, M. ; Eriksson, J.-T. ; Plechacek, V.
Author_Institution :
Lab. of Electr. & Magnetism, Tampere Univ. of Technol., Finland
fDate :
3/1/1993 12:00:00 AM
Abstract :
The authors have studied magnetic flux distribution in polycrystalline (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10+x/ superconductors at 77 K at different stages of an external magnetic field cycle using a movable miniature Hall sensor. The measured magnetic field profiles are compared to profiles achieved by numerical field calculations. The existence of both inter- and intragranular currents causes deviations to the field profiles predicted by classical critical state models, leading to incorrect critical current density estimations, when using standard magnetization measurements.<>
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); flux-line lattice; high-temperature superconductors; lead compounds; strontium compounds; (BiPb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10+x/; critical current density; critical state; external magnetic field cycle; high temperature superconductor; magnetic field profiles; magnetic flux distribution; movable miniature Hall sensor; Critical current density; High temperature superconductors; Magnetic field measurement; Magnetic flux; Magnetic sensors; Measurement standards; Predictive models; State estimation; Strontium; Superconductivity;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
