Critical current properties under high magnetic fields up to 30 T for Y-Ba-Cu-O films by MOCVD

Author

Matsuno, S. ; Uchikawa, F. ; Yoshizaki, K. ; Kobayashi, N. ; Watanabe, K. ; Muto, Y. ; Tanaka, M.

Author_Institution

Mitsubishi Electr. Corp., Kanagawa, Japan

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

1398

Lastpage

1401

Abstract

Y-Ba-Cu-O superconducting film prepared by MOCVD (metalorganic chemical vapor deposition) was shown to have excellent critical current density of 2.7×10⁶ A/cm² at 77 K, 0 T and 2.5×10⁴ cm/2 at 77 K, 30 T respectively. The upper critical field, B_c2, for the film was estimated to be 59 T at 77 K. The activation energy U₀(B), of 1.98 eV at 21 T was determined by electrical resistance measurement under magnetic fields. The Cu composition of the film was approximately 75% over from the stoichiometry of YBa₂Cu₃O_7-x system. The J_c properties under high magnetic fields strongly depended on the Cu composition of the films. The optimum value of Cu ratio for obtaining the highest J_c was about 5.2

Keywords

CVD coatings; barium compounds; critical current density (superconductivity); electronic conduction in insulating thin films; high-temperature superconductors; stoichiometry; superconducting thin films; yttrium compounds; 30 T; 77 K; Cu composition; Y-Ba-Cu-O; activation energy; critical current density; electrical resistance measurement; high temperature superconductor; metalorganic chemical vapor deposition; stoichiometry; superconducting film; Chemical vapor deposition; Critical current; Critical current density; MOCVD; Magnetic field measurement; Magnetic fields; Magnetic films; Magnetic properties; Superconducting films; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133447

Filename

133447