| 用两带Ginzburg-Landau理论分析MgB_2的能隙 |
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| 引用本文： | 刘敏霞,徐永钊.用两带Ginzburg-Landau理论分析MgB_2的能隙[J].东莞理工学院学报,2009,16(5):23-26. |
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| 作者姓名： | 刘敏霞 徐永钊 |
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| 作者单位： | 东莞理工学院,电子工程学院,广东东莞,523808 |
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| 摘 要： | 两带GL理论被应用于MgB_2的转变温度和能隙。理论结果和实验结果在高温区拟合得较好,在低温区,大能隙的理论结果和实验差距较大,这主要是由于GL理论只在T_c附近适用。同时,耦合的加入不仅使超导体实际的转变温度高于σ带和π带的本征转变温度,还增大了σ带和π带的本征能隙。
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| 关 键 词： | GL理论 MgB_2 能隙 两带超导体 |
The Two-band Ginzburg-Landau Theory Based Analysis on the Gaps of the Superconductor MgB_2 |
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| LIU Min-xia,XU Yong-zhao.The Two-band Ginzburg-Landau Theory Based Analysis on the Gaps of the Superconductor MgB_2[J].Journal of Dongguan Institute of Technology,2009,16(5):23-26. |
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| Authors: | LIU Min-xia XU Yong-zhao |
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| Institution: | LIU Min-xia XU Yong-zhao (College of Electronic Engineering,Dongguan University of Technology,Dongguan 523808,China) |
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| Abstract: | The gaps in two-band superconductor MgB_2 are calculated using the two-band GL theory.The theoretical result is in agreement with the experimental result in high temperature condition,but in low temperature condition,for the larger gap,the theoretical result deviates from the experimental result.The reason is that the GL theory can only be used in high temperature condition.The interband interaction not only can enhance the critical temperature,but also can increase the gap. |
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| Keywords: | MgB2 |
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