Title :
Enhanced critical current densities in (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 2/O/sub 10/ silver-sheathed tapes by splayed columnar defects after 600 MeV proton irradiation
Author :
Hensel, B. ; Marti, F. ; Grasso, G. ; Dhalle, M. ; Flukiger, R. ; Paschoud, F. ; Victoria, M.
Author_Institution :
Dept. de Phys. de la Matiere Condensee, Geneva Univ., Switzerland
fDate :
6/1/1997 12:00:00 AM
Abstract :
Splayed columnar defects are efficient pinning centers for magnetic vortices in high-T/sub c/ superconductors. Irradiation with 600 MeV protons as primary projectiles generates heavy fission fragments in (Bi, Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ via a p-Bi nuclear reaction. The high-Z secondary projectiles are sufficiently energetic to create randomly oriented columnar defects with important effects on the magnetic and transport critical current densities of (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ Ag-sheathed tapes. These effects are discussed on the basis of the splayed defect topology.
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); crystal defects; flux pinning; high-temperature superconductors; lead compounds; magnetisation; proton effects; silver; strontium compounds; superconducting tapes; (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ Ag-sheathed tapes; (BiPb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/Ag; 600 MeV; enhanced critical current densities; heavy fission fragments; high-Z secondary projectiles; irreversibility field; magnetic vortex pinning centers; normalized magnetization; proton irradiation; randomly oriented columnar defects; splayed columnar defects; Bismuth; Critical current density; Electrons; High temperature superconductors; Magnetic analysis; Projectiles; Protons; Strontium; Superconducting magnets; Topology;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
