Transport and magnetization currents in BSCCO/Ag tapes

Author

McHenry, M.E. ; Kung, P.J. ; Maley, M.P. ; Willis, J.O. ; Coulter, J.Y.

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1143

Lastpage

1146

Abstract

A (Bi,Pb)SrCaCuO-2223/Ag tape has been produced by thermomechanical processing. Transport critical current densities, J/sub c/´s, have been measured between H=0 and 7 T and T=7 to 75 K. Magnetization currents have been determined for similar temperatures and fields (0 to 5 T) oriented parallel and orthogonal to the thickness of the tape. Dimensional scaling arguments show that flux penetrates most quickly along the tape thickness direction (for fields parallel to the tape plane and therefore the ab planes of the textured BSCCO grains). This implies that the anisotropy ratio of J/sub c/ and J/sub ab/ is reduced in tapes as compared with single crystals, which is consistent with predictions of the brick wall model. The H dependence of the magnetization currents and effective pinning potentials were also measured for similar field orientations. Fast magnetic relaxation causes an exponential field dependence of transport and magnetization currents. Temperature dependences for H/sub 0/ for transport and magnetization measurements are interpreted in terms of different time scales (or voltage criteria).<>

Keywords

bismuth compounds; calcium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; lead compounds; magnetic field effects; magnetic relaxation; silver; strontium compounds; thermomechanical treatment; Ag-(BiPb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10+y/; BSCCO/Ag tapes; HTSC; brick wall model; critical current densities; magnetic relaxation; magnetization currents; pinning potentials; thermomechanical processing; transport; voltage criteria; Anisotropic magnetoresistance; Bismuth compounds; Critical current density; Current measurement; Density measurement; Magnetic field measurement; Magnetization; Temperature; Thermomechanical processes; Thickness measurement;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233352

Filename

233352