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

Volume

26

Issue

5

fYear

1990

fDate

9/1/1990 12:00:00 AM

Firstpage

1427

Lastpage

1429

Abstract

An experimental study indicates that epitaxial thin films of YBa ₂Cu₃O_7-x made by laser ablation have the CuO planes parallel to the film surface. In the CuO plane critical currents of J_c≈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 J_c 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; GdBa₂Cu₃O_7-x; YBa₂Cu₃O_7-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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.104399

Filename

104399