Influence of microcracks and anisotropic conductivity on critical current and exponent n in silver-sheathed HTS tapes

Author

Paasi, J. ; Korpela, A.

Author_Institution

Lab. of Electr. & Magnetism, Tampere Univ. of Technol., Finland

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

2215

Lastpage

2218

Abstract

The influence of filament non-uniformities (microcracks) and anisotropic conductivity on critical current and exponent n of the current-voltage characteristic of HTS/Ag tape conductors was studied numerically by the means of the finite element method. According to the results, non-uniformities reduce the critical current of the conductor, the reduction by a crack being higher in the cases of anisotropic than isotropic conductivity, but their influence on exponent n is negligible. The result suggests that the low n-values of HTS/Ag conductors are due to intrinsic effects such as thermally activated flux creep.

Keywords

critical current density (superconductivity); flux creep; high-temperature superconductors; microcracks; silver; superconducting tapes; Ag-sheathed HTS tapes; anisotropic conductivity; critical current; current-voltage characteristic; finite element method; high temperature superconductor; microcracks; thermally activated flux creep; Anisotropic magnetoresistance; Conductivity; Conductors; Creep; Critical current; Current density; High temperature superconductors; Superconducting magnets; Superconducting materials; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.784909

Filename

784909