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Ray optics behavior of flux avalanche propagation in superconducting films

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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), 060507. doi:10.1103/PhysRevB.91.060507
Published in
Physical Review B
Authors
Mikheenko, P. |
Johansen, T. H. |
Chaudhuri, Saumyadip |
Maasilta, Ilari |
Galperin, Y. M.
Date
2015
Discipline
Fysiikka
Copyright
© 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.
Publisher
American Physical Society
ISSN Search the Publication Forum
1098-0121
Keywords
superconducting films dendrites flux avalanches
DOI
10.1103/PhysRevB.91.060507
URI

http://urn.fi/URN:NBN:fi:jyu-201602081494

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