Flux-periodicity crossover from h/2e to h/e in aluminium nano-loops

Flux-periodicity crossover from h/2e to h/e in aluminium nano-loops
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铝纳米环中从 h/2e 到 h/e 的通量周期交叉

DOI:
10.1088/1742-6596/969/1/012063
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发表时间:
2018
期刊:
Journal of Physics: Conference Series
影响因子:
--
通讯作者:
Y. Yeshurun
Y. Yeshurun
中科院分区:
--
文献类型:
--
作者:
C. Espy;O. J. Sharon;J. Braun;R. Garreis;F. Strigl;A. Shaulov;P. Leiderer;E. Scheer;Y. Yeshurun

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我们研究了铝的“双网络”的磁阻形成的纳米环的顶点连接相对较长的导线,创建两个交错的子网络的小和大的循环(SL和LL,分别)。远低于临界温度,Aharonov-Bohm量子干涉效应观察到的LL和SL子网络。当接近Tc时,两者都表现出通常的Little-Parks振荡,超导通量量子的周期为Φ 0= h/2 e。对于一个具有相对大的相干长度的样本,在非常接近Tc的温度下,SL的Φ 0周期性消失,并且第一周期的波形与最近针对大小为a<λ的环预测的波形一致,指示到2Φ 0周期性的交叉。
We study the magnetoresistance of aluminium'double-networks' formed by connecting the vertexes of nano-loops with relatively long wires, creating two interlaced subnetworks of small and large loops (SL and LL, respectively). Far below the critical temperature, Aharonov-Bohm like quantum interference effects are observed for both the LL and the SL subnetworks. When approaching T c, both exhibit the usual Little-Parks oscillations, with periodicity of the superconducting flux quantum Φ 0= h/2e. For one sample, with a relatively large coherence length, ξ, at temperatures very close to T c, the Φ 0 periodicity of the SL disappears, and the waveform of the first period is consistent with that predicted recently for loops with a size a< ξ, indicating a crossover to 2Φ 0 periodicity.
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