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

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2 Author(s)
Paasi, J. ; Lab. of Electr. & Magnetism, Tampere Univ. of Technol., Finland ; Korpela, A.

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.

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Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )