| Mg/B多层膜退火法中不同制备条件对MgB2超导薄膜性质的影响 |
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| 引用本文： | 刘亮,马小柏,聂瑞娟,姚丹,王福仁.Mg/B多层膜退火法中不同制备条件对MgB2超导薄膜性质的影响[J].物理学报,2009,58(11):7966-7971. |
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| 作者姓名： | 刘亮 马小柏 聂瑞娟 姚丹 王福仁 |
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| 作者单位： | (1)北京大学物理学院,人工微结构和介观物理国家重点实验室,北京 100871; (2)空军航空大学,长春 130022 |
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| 基金项目： | 国家重点基础研究发展计划(973)项目(批准号：2006CB601007)和国家自然科学基金(批准号：10874005)资助的课题. |
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| 摘 要： | 用Mg/B多层膜退火的方法制备了一系列MgB2超导薄膜，研究了退火温度、退火时间和薄膜厚度对于MgB2薄膜性质的影响.厚度为250 nm的Mg/B多层膜经400 ℃低温退火后已经生成超导相，此厚度薄膜750 ℃下退火20—30 min实现最佳超导转变温度（Tc）.前驱膜分层厚度相同时，随着薄膜厚度减小MgB2薄膜Tc明显降低，而且较薄的膜Tc关键词：
2超导薄膜')" href="#">MgB2超导薄膜
电子束蒸发
超导成相
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| 关 键 词： | MgB2超导薄膜 电子束蒸发 超导成相 |
| 收稿时间： | 2009-03-23 |
Properties of MgB_2 films fabricated under different conditions by ex-situ annealing of Mg/B multilayer precursor |
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| Liu Liang,Ma Xiao-Bai,Nie Rui-Juan,Yao Dan and Wang Fu-Ren.Properties of MgB_2 films fabricated under different conditions by ex-situ annealing of Mg/B multilayer precursor[J].Acta Physica Sinica,2009,58(11):7966-7971. |
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| Authors: | Liu Liang Ma Xiao-Bai Nie Rui-Juan Yao Dan and Wang Fu-Ren |
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| Abstract: | The effects of annealing temperature, annealing time and film thickness on the properties of MgB_2 thin films prepared by ex-situ annealing of Mg/B muhilayer have been studied. The films with the thickness of 250 nm annealed at temperatures as low as 400 ℃ exhibited a superconducting transition. The optimal annealing condition of 250 nm thick MgB_2 films regarding to the transition temperature, T_c, was 750 ℃ for 20-30 rain. T_c became lower as the film thickness decreased and the T_c of thinner MgB_2 films was influenced more greatly by the annealing temperature. With reducing the thickness of each single layer, we were able to fabricate the 20 nm thick MgB_2 superconducting film with a T_c~(onset) of 31 K. |
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| Keywords: | MgB2 superconducting films e-beam evaporation superconducting phase formation |
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