Critical Current in YBCO Coated Conductors in the Presence of a Macroscopic Defect

Author

Polak, Milan ; Barnes, Paul N. ; Mozola, Pavol ; Levin, George A.

Author_Institution

Inst. of Electr. Eng., Slovak Acad. of Sci., Bratislava, Slovakia

Volume

19

Issue

3

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

2921

Lastpage

2924

Abstract

We have studied the effects of localized defects in the YBCO coated conductors on the critical current. The artificial defects were introduced into 4, 10 and 12 mm wide tapes as cuts of various lengths made either by laser ablation or mechanical means. Transport measurements were carried out in an external variable magnetic field to obtain the I-V characteristics of the damaged areas. The distribution of the magnetic field in the vicinity of the defects has been mapped as well. The reduction of the critical current by the defects, with and without an external DC magnetic field are discussed and compared with existing theories. A criterion for determining the critical current in the area containing a defect is suggested.

Keywords

barium compounds; critical currents; high-temperature superconductors; laser ablation; magnetisation; superconducting tapes; yttrium compounds; I-V characteristics; YBa₂Cu₃O_7-x; critical current; external DC magnetic field; laser ablation; macroscopic localized defects; magnetization; tapes; transport measurements; Coated conductors; HTS; YBCO; defects;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2009.2019090

Filename

5153215