Applicability of oxide superconductor to magnetic shielding

Author

Okada, T. ; Takahata, K. ; Nishijima, S. ; Yoshida, S. ; Hanasaka, T.

Author_Institution

ISIR Osaka Univ., Japan

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

2270

Lastpage

2272

Abstract

Magnetic shielding capability has been investigated on the Y-B-Cu-O oxide superconductor, aiming at a practical use of oxide superconductors. Critical-transport-current density and magnetization were measured using the four-terminal and electromagnetic methods at temperatures of 77 K and 4.2 K. The results indicated that the critical-current density by the transport measurement was two orders of magnitude lower than that by the magnetization. This means that the larger shielding currents were found to be induced in the grain. The magnetic field behind the disk-shaped specimen was measured using a magnetic sensor. The shielding capability does not depend upon the critical-current density derived from magnetization but the critical-transport-current density. The applicability of oxide superconductors to magnetic shielding is discussed

Keywords

barium compounds; critical current density (superconductivity); high-temperature superconductors; magnetic shielding; magnetisation; yttrium compounds; 4.2 K; 77 K; Y-B-Cu-O; critical-current density; high temperature superconductors; magnetic shielding; magnetization; oxide superconductor; shielding currents; Critical current density; Current density; Current measurement; Density measurement; Electromagnetic measurements; Magnetic field measurement; Magnetic sensors; Magnetic shielding; Magnetization; Temperature;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92760

Filename

92760