Manipulating superconducting fluctuations by the Little–Parks–de Gennes effect in ultrasmall Al loops
Manipulating superconducting fluctuations by the Little–Parks–de Gennes effect in ultrasmall Al loops
复制标题
通过超小型铝环路中的 Little-Parks-de Gennes 效应控制超导涨落
DOI：
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发表时间：
2011
影响因子：
11.1
通讯作者：
Y. Liu
中科院分区：
文献类型：
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作者：
N. Staley;Y. Liu
量子涨落对超导相位相干性的破坏以及对这些涨落的控制是一个长期感兴趣的问题，这些问题与追求高温超导性的相关性提供了最近的动力。在利特尔和帕克斯的工作基础上，德·热内斯在30多年前预测，超导性可以在超小回路中的半整数通量量子附近被破坏，导致破坏性状态，并通过添加超导侧分支来恢复，这不会影响通量量子化条件。我们报告的实验观察，这种小公园德热内效应的Al回路先进的电子束光刻制备。我们表明，效果可以用来恢复丢失的相位相干性，通过采用侧支。
The destruction of superconducting phase coherence by quantum fluctuations and the control of these fluctuations are a problem of long-standing interest, with recent impetus provided by the relevance of these issues to the pursuit of high temperature superconductivity. Building on the work of Little and Parks, de Gennes predicted more than three decades ago that superconductivity could be destroyed near half-integer-flux quanta in ultrasmall loops, resulting in a destructive regime, and restored by adding a superconducting side branch, which does not affect the flux quantization condition. We report the experimental observation of this Little–Parks–de Gennes effect in Al loops prepared by advanced e-beam lithography. We show that the effect can be used to restore the lost phase coherence by employing side branches.