Article (Scientific journals)
Tunable domino effect of thermomagnetic instabilities in superconducting films with multiply-connected topological structures
Jiang, Lu; Xue, Cun; Marinkovic, Stefan et al.
2022In New Journal of Physics, 24 (8), p. 083017
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Keywords :
General Physics and Astronomy
Abstract :
[en] Abstract Topology is a crucial ingredient for understanding the physical properties of superconductors. Magnetic field crowds to adopt the form of topologically-protected quantum flux lines which can lose this property when moving at high velocities. These extreme conditions can be realized when superconductors undergo a thermomagnetic instability for which the sample topology come also into play. In this work, utilizing the magneto-optical imaging technique, we experimentally study magnetic flux avalanches in superconducting films with multiply-connected geometries, including single and double rings. We observe a domino effect in which avalanches triggered at the outer ring, stimulate avalanches at the inner ring thus impairing the expected magnetic shielding resulting from the outer ring and gap. We implement numerical simulations in order to gain more insight into the underlying physical mechanism and demonstrate that such event is not caused by the heat conduction, but mainly attributed to the local current distribution variation near the preceding flux avalanche in the outer ring, which in turn has a ripple effect on the local magnetic field profile in the gap. Furthermore, we find that the domino effect of thermomagnetic instabilities can be switched on/off by the environmental temperature and the gap width between the concentric rings. These findings provide new insights on the thermomagnetic instability in superconducting devices with complex topological structures, such as the superconductor–insulator–superconductor multilayer structures of superconducting radio-frequency cavities.
Disciplines :
Physics
Author, co-author :
Jiang, Lu
Xue, Cun 
Marinkovic, Stefan  ;  Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés
Fourneau, Emile  ;  Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Xu, Tie-Quan 
Cai, Xin-Wei 
Nguyen, Ngoc Duy  ;  Université de Liège - ULiège > Complex and Entangled Systems from Atoms to Materials (CESAM)
Silhanek, Alejandro  ;  Université de Liège - ULiège > Département de physique
Zhou, You-He
Language :
English
Title :
Tunable domino effect of thermomagnetic instabilities in superconducting films with multiply-connected topological structures
Publication date :
01 August 2022
Journal title :
New Journal of Physics
ISSN :
1367-2630
Publisher :
IOP Publishing
Volume :
24
Issue :
8
Pages :
083017
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
NSCF - National Natural Science Foundation of China [CN]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
CSC - China Scholarship Council [CN]
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since 24 August 2022

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