Title :
High current densities in superconducting films from magnetization
Author :
McGuire, T.R. ; Gupta, A. ; Koren, G. ; Gross, R.
Author_Institution :
IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA
fDate :
9/1/1990 12:00:00 AM
Abstract :
An experimental study indicates that epitaxial thin films of YBa 2Cu3O7-x made by laser ablation have the CuO planes parallel to the film surface. In the CuO plane critical currents of Jc≈40×106 A/cm2 were found at 5 K in zero field. Multilayered films with Gd replacing Y, each 0.01 μm in thickness, have a Jc nearly equal to 140×106 A/cm2. This higher value is perhaps due to additional point defects. Perpendicular to the CuO planes, Magnetization studies indicate strong pinning effects attributed to the CuO planes acting as barriers to flux motion
Keywords :
barium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; magnetisation; point defects; superconducting epitaxial layers; yttrium compounds; 5 K; GdBa2Cu3O7-x; YBa2Cu3O7-x; critical currents; epitaxial thin films; flux motion; high temperature superconductors; laser ablation; magnetization; multilayered films; pinning effects; point defects; Critical current; Demagnetization; Laser ablation; Magnetic field measurement; Magnetization; Pulsed laser deposition; Superconducting films; Superconducting thin films; Surface emitting lasers; Time measurement;
Journal_Title :
Magnetics, IEEE Transactions on
