Percolative nature of current transport in polycrystalline MgB₂ wires

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• 作者：Mohammed Shahabuddin ; Nasser Saleh Alzayed ; Sangjun Oh ; Seyong Choi ; Minoru Maeda ; Muhammed Shahabuddin Shah ; Ashkan Motaman ; Md Shahriar Al Hossain ; Jung Ho Kim
• 关键词：A. Superconductors ; A. MgB2 ; D. Critical current ; D. Percolative nature
• 刊名：Solid State Communications
• 出版年：March, 2014
• 年：2014
• 卷：181
• 期：Complete
• 页码：20-23
• 全文大小：611 K

文摘

The percolation model, taking into account the percolative nature of current transport due to anisotropy, is a powerful tool for predicting the field and temperature dependences of critical current in MgB₂ superconducting wires. The critical current behaviour measured from MgB₂ wires can be obviously explained by only four fitting parameters, the anisotropy parameter, the pinning force maximum, the upper critical field along the ab-plane, and the percolation threshold. Moreover, the temperature dependence of the upper critical field is further explained by the dirty-limit two-gap theory.