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Optically triggered chaotic vortex avalanches in superconducting YBa2Cu3O7−xfilms
Physical Review Applied ( IF 4.6 ) Pub Date : You-He Zhou, Cunhong Wang, Cong Liu, Huadong Yong, and Xingyi Zhang
Physical Review Applied ( IF 4.6 ) Pub Date : You-He Zhou, Cunhong Wang, Cong Liu, Huadong Yong, and Xingyi Zhang
Flux avalanche is commonly found in type-II superconductors, and this event is always featured as unpredictable and ultra-fast development with time. It is difficult to be captured dynamically by any experimental method available today. In this letter, we firstly propose a hypervelocity magnetic-optical system with two optical branches; one branch can trigger a dendritic flux avalanche in a superconducting film, and the other is capable of producing continuous multiexposure} to record the lightning avalanche process In contrast with some traditional trigger models, the present method realizes control of the position where the flux avalanche takes place. Second, we study the sensitive dependence on initial conditions} (SDIC) of the present flux avalanche for the first time and find series of positive Lyapunov exponents} between two adjacent trajectories which could be considered direct evidence for the chaotic dynamics in this kind of avalanche. Moreover, we reveal that whether the laser spot is in the Meissner state or the mixed state, avalanches always penetrate from the edge of the superconducting film to the Meissner region instead of occurring around the laser spot. This behavior clearly demonstrates the presented avalanche is driven by the magnetic pressure force}, suggesting that the optically triggered vortex avalanche possesses a new mechanism other than the thermomagnetic avalanches that are commonly found in superconducting films.
中文翻译:
超导YBa2Cu3O7-x薄膜中的光触发混沌涡流雪崩
助焊剂雪崩常出现在II型超导体中,并且该事件始终具有随时间变化而难以预测且超快发展的特点。很难通过当今可用的任何实验方法来动态捕获。在这封信中,我们首先提出了具有两个光学分支的超高速磁光系统。一个分支可以触发超导膜中的树枝状助焊剂雪崩,而另一分支则能够产生连续多次曝光以记录雷电雪崩过程。与某些传统触发模型相比,本方法实现了对助焊剂雪崩发生位置的控制。地点。第二,我们首次研究了当前通量雪崩对初始条件的敏感性依赖性(SDIC),并在两个相邻轨迹之间找到一系列正Lyapunov指数,这可以被视为这种雪崩中混沌动力学的直接证据。此外,我们揭示了无论激光斑处于迈斯纳状态还是混合状态,雪崩总是从超导膜的边缘穿透到迈斯纳区域,而不是在激光斑周围发生。这种行为清楚地表明了所提出的雪崩是由磁压力驱动的,这表明光学触发的涡流雪崩具有超导薄膜中常见的热磁雪崩以外的其他机制。
更新日期:2020-01-16
中文翻译:
超导YBa2Cu3O7-x薄膜中的光触发混沌涡流雪崩
助焊剂雪崩常出现在II型超导体中,并且该事件始终具有随时间变化而难以预测且超快发展的特点。很难通过当今可用的任何实验方法来动态捕获。在这封信中,我们首先提出了具有两个光学分支的超高速磁光系统。一个分支可以触发超导膜中的树枝状助焊剂雪崩,而另一分支则能够产生连续多次曝光以记录雷电雪崩过程。与某些传统触发模型相比,本方法实现了对助焊剂雪崩发生位置的控制。地点。第二,我们首次研究了当前通量雪崩对初始条件的敏感性依赖性(SDIC),并在两个相邻轨迹之间找到一系列正Lyapunov指数,这可以被视为这种雪崩中混沌动力学的直接证据。此外,我们揭示了无论激光斑处于迈斯纳状态还是混合状态,雪崩总是从超导膜的边缘穿透到迈斯纳区域,而不是在激光斑周围发生。这种行为清楚地表明了所提出的雪崩是由磁压力驱动的,这表明光学触发的涡流雪崩具有超导薄膜中常见的热磁雪崩以外的其他机制。