Penetration depth of MgB2 measured using Josephson junctions and SQUIDs
Penetration depth of MgB2 measured using Josephson junctions and SQUIDs
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使用约瑟夫森结和 SQUID 测量 MgB2 的穿透深度
DOI：
10.1063/1.4793194
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
T. Lemberger
中科院分区：
文献类型：
--
作者：
D. Cunnane;C. Zhuang;Ke Chen;X. Xi;J. Yong;T. Lemberger
采用两种不同机理的方法测量了MgB2的穿透深度。第一种方法使用MgB2约瑟夫森结和磁场依赖的结临界电流。第二种方法是利用MgB2微带线的电感值来计算穿透深度，该微带线用于调制MgB2直流SQUID的电压。这两种方法显示了MgB2的低温渗透深度的一致值为约40 nm。小的穿透深度值和它的温度依赖性都与MgB2在清洁极限的微观理论相一致。
The penetration depth of MgB2 was measured using two methods of different mechanisms. The first method used MgB2 Josephson junctions and the magnetic field dependence of the junction critical current. The second method deduced the penetration depth from the inductance of a MgB2 microstrip used to modulate the voltage of a MgB2 DC SQUID. The two methods showed a consistent value of the low-temperature penetration depth for MgB2 to be about 40 nm. Both the small penetration depth value and its temperature dependence are in agreement with a microscopic theory for MgB2 in the clean limit.