Direct Determination of the Power Threshold Value of Vortex Avalanche in YBa2Cu3O7-x Thin Films Triggered by a Laser Pulse

Wang, Cunhong; Liu, Cong; Zhang, Xingyi; Zhou, Youhe

doi:10.1007/s11340-021-00727-4

Cited by 3 publications

(1 citation statement)

References 41 publications

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“…These authors used a discontinuous double exposure pump-probe technique to reveal the propagation of flux avalanches with speeds over 180 km s −1 [45]. More recently, a closed ultrahigh-speed measurement system based on a picosecond-pulse laser and multiple-exposure optical path have been established [46,47]. By using this method, Zhou et al [48] not only realized full control of the nucleation position of flux avalanches, but also provided direct evidence for the chaotic dynamics of these events.…”

Section: Introductionmentioning

confidence: 99%

Tunable magnetic flux avalanches triggered by a focalized laser spot

Li¹,

Jiang²,

Zhou³

et al. 2022

Supercond. Sci. Technol.

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Magnetic flux avalanches caused by thermomagnetic instabilities are a common phenomenon occuring in type II superconducting films. The unpredictability of these catastrophic events threaten the application of superconducting thin film equipment, such as high-temperature superconducting magnets. In the present work, through the fast Fourier transform method, we numerically investigate artificially triggered flux avalanches in superconducting films by a focalized laser, unveiling new features beyond naturally occurring avalanches. The numerical modeling is validated by reproducing previous experimental results. We investigate the effects of laser irradiation on the nucleation and evolution of flux avalanches for different cases, namely varying the laser irradiation position, laser power, laser-spot size, ramping rate of applied magnetic field and working temperature. We find that the laser irradiation can control and guide the position of flux avalanche at applied magnetic fields with small ramping rate, while the similar guidance effect cannot be observed at high ramping field. We demonstrate that such phenomenon can be tuned by environmental temperature, and the mechanism can be revealed by current crowding and local temperature around the laser spot. Furthermore, by considering a pair of laser spots, we observe two tunable scenarios by the laser power, (i) single flux avalanche triggered at one of laser spots and (ii) double flux avalanches triggered at both laser spots.

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Section: Introductionmentioning

confidence: 99%

Tunable magnetic flux avalanches triggered by a focalized laser spot

Li¹,

Jiang²,

Zhou³

et al. 2022

Supercond. Sci. Technol.

Self Cite

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Suppression of flux avalanches in YBCO superconducting thin films by coating metal investigated using magneto-optical imaging

Ran,

Jing,

Shen

et al. 2024

Superconductivity

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Dependence of thermomagnetic instability on strong nonlinear <i>E</i>-<i>J</i> models in superconducting films

Wang¹,

Jiang²,

Zhou³

et al. 2022

Acta Phys. Sin.

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The <inline-formula><tex-math id="M4">\begin{document}$ E-J $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="20-20220285_M4.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="20-20220285_M4.png"/></alternatives></inline-formula> relationship in conventional conductor generally satisfies linear Ohm's law. However, the <inline-formula><tex-math id="M5">\begin{document}$ E-J $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="20-20220285_M5.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="20-20220285_M5.png"/></alternatives></inline-formula> model in superconductors presents strong nonlinear characteristics, which is significantly different from that of conventional conductor.With the nonlinear <inline-formula><tex-math id="M6">\begin{document}$ E-J $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="20-20220285_M6.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="20-20220285_M6.png"/></alternatives></inline-formula> power law of superconducting materials by using the fast Fourier transform method (FFT), we quantitatively investigate the relationship between the magnetic-thermal stability and the nonlinear constitutive relation of superconducting films at different temperature, magnetic field ramp rate and critical current density. We find that the strong nonlinear electromagnetic constitutive model plays a crucial role in the onset and morphology (tree-like and finger-like) of the magneto-thermal instability of superconducting thin films. In addtion, the reason why similar magneto-thermal instabilities cannot be observed in conventional conductors is also explained. It can be found that the magnetic field on the border of the superconducting film increases rapidly for a larger creep exponent due to the enhancement of diamagnetism, which results in a large magnetic pressure and easily trigger flux avalanches. Therefore, the threshold field of flux avalanches in superconducting film decreases with flux creep exponent. Finally, we present the curves that can clearly divide the <inline-formula><tex-math id="M7">\begin{document}$ n_0-j_{c0} $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="20-20220285_M7.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="20-20220285_M7.png"/></alternatives></inline-formula> plane and <inline-formula><tex-math id="M8">\begin{document}$ n_0-\dot {H}_a $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="20-20220285_M8.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="20-20220285_M8.png"/></alternatives></inline-formula> plane into magneto-thermal stability region and magneto-thermal stability regions for superconducting thin film with different levels of nonlinearity.

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Direct Determination of the Power Threshold Value of Vortex Avalanche in YBa2Cu3O7-x Thin Films Triggered by a Laser Pulse

Cited by 3 publications

References 41 publications

Tunable magnetic flux avalanches triggered by a focalized laser spot

Tunable magnetic flux avalanches triggered by a focalized laser spot

Suppression of flux avalanches in YBCO superconducting thin films by coating metal investigated using magneto-optical imaging

Dependence of thermomagnetic instability on strong nonlinear <i>E</i>-<i>J</i> models in superconducting films

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