Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors
Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors
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DOI：
10.1103/physrevlett.104.047003
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发表时间：
2010-01-29
影响因子：
8.6
通讯作者：
Clem, John R.
中科院分区：
文献类型：
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作者：
Sadleir, John E.;Smith, Stephen J.;Clem, John R.
我们已经发现，实验上的临界电流的方形薄膜超导过渡边缘传感器（TES）指数依赖于边长L和温度T的平方根，一个行为，有一个自然的理论解释纵向邻近效应，如果TES被视为超导引线之间的薄弱环节。因此，TES的有效转变温度T-c是电流依赖性的，并且在固定的电流标度为1/L-2。我们还发现，临界电流可以显示出明确的夫琅和费样振荡在外加磁场中，类似于约瑟夫森结中发现的。我们已经观察到在这些设备中的纵向邻近效应超过非常长的长度高达290 μ m，1450倍的平均自由路径。
We have found experimentally that the critical current of a square thin-film superconducting transition-edge sensor (TES) depends exponentially upon the side length L and the square root of the temperature T, a behavior that has a natural theoretical explanation in terms of longitudinal proximity effects if the TES is regarded as a weak link between superconducting leads. As a consequence, the effective transition temperature T-c of the TES is current dependent and at fixed current scales as 1/L-2. We have also found that the critical current can show clear Fraunhofer-like oscillations in an applied magnetic field, similar to those found in Josephson junctions. We have observed the longitudinal proximity effect in these devices over extraordinarily long lengths up to 290 mu m, 1450 times the mean-free path.