Ray optics behavior of flux avalanche propagation in superconducting films
Mikheenko, P., Johansen, T. H., Chaudhuri, S., Maasilta, I., & Galperin, Y. M. (2015). Ray optics behavior of flux avalanche propagation in superconducting films. Physical Review B, 91(6), Article 060507. https://doi.org/10.1103/PhysRevB.91.060507
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Physical Review BDate
2015Copyright
© 2015 American Physical Society. Published in this repository with the kind permission of the publisher.
Experimental evidence of wave properties of dendritic flux avalanches in superconducting films is reported.
Using magneto-optical imaging the propagation of dendrites across boundaries between a bare NbN film and
areas coated by a Cu layer was visualized, and it was found that the propagation is refracted in full quantitative
agreement with Snell’s law. For the studied film of 170 nm thickness and a 0.9 μm thick metal layer, the refractive
index was close to n = 1.4. The origin of the refraction is believed to be caused by the dendrites propagating as
an electromagnetic shock wave, similar to damped modes considered previously for normal metals. The analogy
is justified by the large dissipation during the avalanches raising the local temperature significantly. Additional
time-resolved measurements of voltage pulses generated by segments of the dendrites traversing an electrode
confirm the consistency of the adopted physical picture.
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American Physical SocietyISSN Search the Publication Forum
1098-0121Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/24602379
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