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Poster (Scientific congresses and symposiums)
Statistics of thermomagnetic breakdown in Nb superconducting films
Brisbois, Jérémy
201812th International Conference on Materials and Mechanisms of Superconductivity (M2S-2018)
 

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Keywords :
superconductivity; thermomagnetic instabilities; flux avalanches; magneto-optical imaging; MOI
Abstract :
[en] Superconducting materials tend to expel the magnetic field from their bulk up to a certain field, where flux lines start to penetrate the material. Unfortunately, the motion of these fluxons leads to heating, which locally destroys superconductivity and thus limits the potential applications. Under certain conditions, flux penetration is no longer smooth, but becomes abrupt and takes the form of flux avalanches propagating at ultrasonic velocities and resulting from thermomagnetic instabilities. The physics in this kind of system shows some similarities with that of dielectric breakdown, fractures propagation, snow avalanches, or earthquakes. In all these examples, the triggering of this phenomenon might have dramatic consequences, such as irreversible changes in the system. This makes the statistical study of the phenomenon very complex, since a large amount of samples replicas are required. However, avalanches in superconductors are an ideal playground to investigate the statistics of the phenomenon, since they generally do not modify the material nor its properties. Until now, theoretical predictions or experimental studies on the statistic distribution of the magnetic field necessary to trigger avalanches remain elusive. Moreover, the conditions and the parameters acting on the threshold field are unknown. In this work, we tackle these problems by performing magneto-optical imaging experiments on a rectangular Nb thin film, where nanometric heating elements are used to clean the magnetic history of the sample in a few seconds. This allows to repeat the same experiment thousands of times and get access for the first time to the investigation of the statistic distribution of the avalanche phenomenon.
Disciplines :
Physics
Author, co-author :
Brisbois, Jérémy ;  Université de Liège - ULiège > Département de physique > Département de physique
Language :
English
Title :
Statistics of thermomagnetic breakdown in Nb superconducting films
Publication date :
August 2018
Event name :
12th International Conference on Materials and Mechanisms of Superconductivity (M2S-2018)
Event place :
Beijing, China
Event date :
du 19 août au 24 août 2018
Audience :
International
Available on ORBi :
since 14 November 2018

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