Electrical transport characteristics of superconducting MgB2–MgO composite near continuous percolation

Superconducting MgB2–MgO composite with about 75% mole concentration of MgO was synthesized in situ by a single-replacement reaction. The resistance versus temperature curve shows that the composite has a high superconducting transition temperature to 38.0 K and metallic transport behavior with low...

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Bibliographic Details
Published in:Journal of applied physics 2010-06, Vol.107 (12)
Main Authors: Zhang, Yi Bing, Zhou, Di Fan, Lv, Zhen Xing, Deng, Zhen Yan, Cai, Chuan Bing, Zhou, Shi Ping
Format: Article
Language:English
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Summary:Superconducting MgB2–MgO composite with about 75% mole concentration of MgO was synthesized in situ by a single-replacement reaction. The resistance versus temperature curve shows that the composite has a high superconducting transition temperature to 38.0 K and metallic transport behavior with low resistivity and highly residual resistance ratio comparable to a pure MgB2 sample. These characteristics are explained by using the statistical percolation model and a conductivity expression with temperature for the metal–insulator MgB2 composite is given in this paper. The results indicate that MgB2 superconductor can tolerance a high content of insulating contamination and this metal–insulator MgB2–MgO composite can be utilized for the superconducting fault current limiter.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3437037