Title :
Effect of light ion irradiation on the flux dynamics of YBa2 Cu3O7-δ thin films
Author :
Arias, D. ; Sefrioui, Z. ; Gonzalez, E.M. ; Villegas, J.E. ; Santamaria, J. ; Vicent, J.L.
Author_Institution :
Dpto. Fisica Aplicada III, Univ. Complutense de Madrid, Spain
fDate :
3/1/2001 12:00:00 AM
Abstract :
Thin films of 123 cuprates (YBa2Cu3O7 ) grown by DC sputtering are irradiated with light ion (He+ ) at 80 keV and with doses in the range 1014-1015 cm-2. The point disorder defects, due to light ion irradiation, cause a systematic decrease of the critical temperature. The effect of light ion irradiation on the vortex phase behavior is explored by critical currents from transport and magnetization loops (solid vortex phase) and resistivity (liquid state) in perpendicular fields. Although point disorder does not significantly affect dissipation in the solid state, the dissipation in the liquid is governed by plastic deformation of vortices favored by point disorder pinning
Keywords :
barium compounds; critical currents; flux pinning; high-temperature superconductors; ion beam effects; magnetisation; point defects; sputtered coatings; superconducting thin films; superconducting transition temperature; yttrium compounds; 80 keV; DC sputtering; HTSC; YBa2Cu3O7-δ thin films; YBa2Cu3O7; critical currents; critical temperature; cuprates; dissipation; flux dynamics; light ion irradiation; liquid state; magnetization loops; perpendicular fields; plastic deformation; point disorder defects; point disorder pinning; resistivity; solid vortex phase; transport; vortex phase behavior; vortices; Conductivity; Critical current; Current measurement; Helium; Magnetic fields; Solids; Sputtering; Substrates; Temperature; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
