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利用两步原位电子束蒸发技术,在Si(111)衬底上制备了MgB2-B-MgB2超导SNS约瑟夫森夹心结.夹心硼(B)层厚度从10nm到80nm范围内MgB2-B-MgB2/Si(111)薄膜表现出明显的SNS约瑟夫森结特性,而在5nm和100nm处薄膜分别是整体超导和正常金属特性.在同一温度下,随着硼层厚度的增加,临界结电流减小,对同一厚度下,临界结电流随着温度的增加而减小.同时,实验指出,夹心硼SNS超导MgB2约瑟夫森结的电流-电压(I-V)曲线具有回滞现象,符合SM模型.

参考文献

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[3] Alexander Brinkman;Dick Veldhuis;Dragana Mijatovic;Guus Rijnders;Dave H. A. Blank;Hans Hilgenkamp;Horst Rogalla .Superconducting quantum interference device based on MgB_(2) nanobridges[J].Applied physics letters,2001(15):2420-2422.
[4] Ke Chen;Y. Cui;Qi Li;X. X. Xi .Study of Planar MgB{sub}2/TiB{sub}2/MgB{sub}2 Josephson Junctions Using the Proximity Effect SNS Model[J].IEEE Transactions on Applied Superconductivity: A Publication of the IEEE Superconductivity Committee,2007(2 Pt.1):955-958.
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