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A comparative study on field, temperature, and strain dependences of the critical current for doped and undoped MgB2 wires based on the percolation model

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posted on 2024-11-16, 08:19 authored by Sangjun Oh, Jung Ho KimJung Ho Kim, Kyuhwan Cho, Chulhee Lee, Chan-Joong Kim, Shi DouShi Dou, M Rindfleisch, Mike Tomsic, Jung-Ho Ahn
Field, temperature, and strain dependences of the critical current for a SiC doped multifilamentary in situ MgB2 wire have been studied. Measurement results were compared with that of the undoped wire, and the origin of the difference in the critical current is discussed. The critical current can be calculated with the percolation model considering the effect of anisotropy. The temperature dependence of the fitting parameters, the upper critical field along the ab-plane, and c-axis is compared with the dirty-limit two-gap theory. To assess the validity of the fitting parameters, resistive transition has been measured especially to extract the upper critical field directly. It is shown that even the resistive broadening can be well explained by a simple parallel path model using the fitting parameters obtained from the critical current analysis.

Funding

Current limiting mechanisms in magnesium diboride superconductors

Australian Research Council

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History

Citation

Oh, S., Kim, J., Cho, K., Lee, C., Kim, C., Dou, S. Xue., Rindfleisch, M., Tomsic, M. Ahn, J. (2009). A comparative study on field, temperature, and strain dependences of the critical current for doped and undoped MgB2 wires based on the percolation model. Journal of Applied Physics, 106 (6), 063912-1-063912-5.

Journal title

Journal of Applied Physics

Volume

106

Issue

6

Pagination

063912-1-063912-5

Language

English

RIS ID

31384

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