Title :
Magneto-optical investigations as a tool to improve quality of (Pb,Bi)-2223 tapes
Author :
Koblischka, M.R. ; Wang, W.G. ; Seifi, B. ; Skov-Hansen, P. ; Vase, P. ; Andersen, N.H.
Author_Institution :
Nordic Superconductor Technol. AS, Brondby, Denmark
fDate :
3/1/2001 12:00:00 AM
Abstract :
Flux distributions of multifilamentary (Pb,Bi)-2223 tapes are investigated by magneto-optic (MO) imaging at T=10 K and in different field orientations. This enables one to study differences between the individual filaments in a direct way. To our knowledge we have for the first time applied the field perpendicular to a cross section of an intact tape, i.e. The external field is aligned along the individual filaments. This geometry of the MO experiments enables the study of the superconducting properties of the filaments as a function of position in the tape. The flux patterns reveal the shielding properties (=critical current density) of the filaments; and the studies clearly show differences in the superconducting properties between the different filaments. Our observations provide, therefore, important information for further development of the (Pb,Bi)-2223 tapes
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); flux-line lattice; high-temperature superconductors; lead compounds; magneto-optical effects; multifilamentary superconductors; strontium compounds; superconducting tapes; (BiPb)2Sr2Ca2Cu3O 10; (Pb,Bi)-2223 tapes; 10 K; critical current density; filaments; flux distributions; flux patterns; magneto-optic imaging; magneto-optical investigations; multifilamentary (Pb,Bi)-2223 tapes; quality; shielding properties; Chemical technology; Critical current density; Geometry; Laboratories; Magnetic fields; Multifilamentary superconductors; Physics; Spatial resolution; Superconducting filaments and wires; Superconducting films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
