Fluxoid quantization in the critical current of a niobium superconducting loop far below the critical temperature

Sebastien Michotte; Damien Lucot; Dominique Mailly

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Fluxoid quantization in the critical current of a niobium superconducting loop far below the critical temperature

机译：远低于临界温度的铌超导回路的临界电流中的助焊剂量化

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The critical current of a niobium type II superconducting loop has been measured far below the critical temperature using contacts applied symmetrically or asymmetrically around the loop. The magnetic field dependence of the critical current allows a direct observation of the circulating current resulting from the fluxoid quantization and presents a saw-tooth behavior. The periodicity is given by a flux quantum through the outer area of the loop. Despite the presence of many vortices at high magnetic fields, the circulating current finds its way in between them and still has an impact on the total critical current of the loop. Macroscopic quantum coherence effects in such a niobium loop allow observing single quanta changes of the fluxoid up to a magnetic field of 1.2 T.

机译：使用对称或不对称施加在环路周围的触点，已测量出II型铌超导环路的临界电流，使其远低于临界温度。临界电流的磁场依赖性使得可以直接观察由磁通量量化产生的循环电流，并呈现出锯齿状。周期性由通过环路外部区域的通量量子给出。尽管在强磁场中存在许多涡流，但循环电流仍在它们之间，并且仍然会对环路的总临界电流产生影响。在这样的铌环中，宏观的量子相干效应使得可以观察到最大磁通量为1.2 T的磁通量的单个量子变化。

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来源
《Physical review》 |2010年第10期|p.100503.1-100503.4|共4页
作者
Sebastien Michotte; Damien Lucot; Dominique Mailly;
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作者单位

Unite de Physico-Chimie et de Physique des Materiaux (PCPM), Universite Catholique de Louvain, Place Croix du Sud 1,B-1348 Louvain-la-Neuve, Belgium;

Laboratoire de Photonique et de Nanostructures (LPN-CNRS), route de Nozay, 91460 Marcoussis, France;

Laboratoire de Photonique et de Nanostructures (LPN-CNRS), route de Nozay, 91460 Marcoussis, France;

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正文语种 eng
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关键词
mesoscopic and nanoscale systems; critical currents;

机译：介观和纳米系统;临界电流;

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Fluxoid quantization in the critical current of a niobium superconducting loop far below the critical temperature

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