Title :
Surface columnar defects on melt textured Y-Ba-Cu-O
Author :
Gozzelino, L. ; Chiodoni, A. ; Gerbaldo, R. ; Ghigo, G. ; Minetti, B. ; Mezzetti, E. ; Krabbes, G. ; Rovelli, A.
Author_Institution :
Politecnico di Torino, Italy
fDate :
3/1/2001 12:00:00 AM
Abstract :
In this paper we report on the effect of columnar defects created only in a surface sheet of high quality melt textured YBCO by means of 2 GeV gold ions. The ion tracks implant in a few percent fraction of the full sample thickness. Maps of the trapped field at 77 K in a large size pellet, before and after irradiation, are shown. A full magnetic characterization of small size samples in the high temperature regime is also presented. The data point coherently to the conclusion that in this region some correlated disorder, artificially created only in a small fraction of the sample, can extend its benefits to the whole sample
Keywords :
barium compounds; critical current density (superconductivity); crystal defects; flux pinning; high-temperature superconductors; ion beam effects; magnetic susceptibility; melt texturing; surface structure; yttrium compounds; 77 K; YBa2Cu3O7; YBa2Cu3O7:Au; correlated disorder; gold ions; high quality melt textured YBCO; ion tracks; irradiation; large size pellet; magnetic characterization; melt textured Y-Ba-Cu-O; small size samples; surface columnar defects; surface sheet; trapped field; Creep; Critical current density; Gold; Implants; Magnetic flux; Scanning electron microscopy; Superconducting magnets; Surface texture; Temperature distribution; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
