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14 Jan 2013

Volume 102, Issue 2, Articles (02xxxx)

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Appl. Phys. Lett. 102, 023901 (2013); http://dx.doi.org/10.1063/1.4773526 (4 pages)

Yoshihiro Gohda and Shinji Tsuneyuki
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Nanosecond voltage pulses from dendritic flux avalanches in superconducting NbN films

P. Mikheenko, A. J. Qviller, J. I. Vestgården, S. Chaudhuri, I. J. Maasilta, Y. M. Galperin, and T. H. Johansen

Appl. Phys. Lett. 102, 022601 (2013); http://dx.doi.org/10.1063/1.4775693 (3 pages)

Online Publication Date: 15 January 2013

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Combined voltage and magneto-optical study of magnetic flux flow in superconducting NbN films is reported. The nanosecond-scale voltage pulses appearing during thermomagnetic avalanches have been recorded in films partially coated by a metal layer. Simultaneous magneto-optical imaging and voltage measurements allowed the pulses to be associated with individual flux branches penetrating the superconductor below the metal coating. From detailed characteristics of pulse and flux branches, the electrical field in the superconductor is found to be in the range of 5-50 kV/m, while the propagation speed of the avalanche during its final stage is found to be close to 5 km/s.
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74.78.-w Superconducting films and low-dimensional structures
78.20.Ls Magneto-optical effects
74.25.Wx Vortex pinning (includes mechanisms and flux creep)
74.25.fg Thermoelectric effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
74.25.Gz Optical properties
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