Avalanches injecting flux into the central hole of a superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>ring

Olsen, Å. A. F.; Johansen, T. H.; Shantsev, D. V.; Choi, Eun-Mi; Lee, Hyun Sook; Kim, Hyun Jung; Lee, Sung‐Ik

doi:10.1103/physrevb.76.024510

Cited by 11 publications

(5 citation statements)

References 37 publications

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“…ring geometry. 29 Note that for small fields Φ h is close to, but not exactly zero. The reason is the creation of two additional flux fronts: one positive towards the flux-free region and one negative towards the edge, as also seen in Fig.…”

Section: Strip With a Circular Holementioning

confidence: 96%

Flux distribution in superconducting films with holes

et al. 2008

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Flux penetration into type-II superconducing films is simulated for transverse applied magnetic field and flux creep dynamics. The films contain macroscopic, non-conducting holes and we suggest a new method to introduce the holes in the simulation formalism. The method implies reconstruction of the magnetic field change inside the hole. We find that in the region between the hole and the edge the current density is compressed so that the flux density is slightly reduced, but the traffic of flux is significantly increased. The results are in good agreement with magneto-optical studies of flux distributions in YBa2Cu3Ox films.

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Section: Strip With a Circular Holementioning

confidence: 96%

Flux distribution in superconducting films with holes

et al. 2008

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“…Flux avalanches have been observed in films ofYBa 2 Cu 3 O 7-x , MgB 2 , Nb 3 Sn etc by magneto-optical imaging [5][6][7]. Onset condition for the flux avalanche have been investigated by using linear stability analysis [8].…”

Section: Theoretical Backgrounds and Basic Equationsmentioning

confidence: 99%

Thermomagnetic instability and correlated deformation in the type-II superconducting films

Jing¹,

Yong²,

Zhou³

2015

AIP Conference Proceedings

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Articles you may be interested inMagneto-elastic behaviour of thin type-II superconducting strip with field-dependent critical current Effective microwave surface impedance of a thin type-II superconducting film in the parallel magnetic field Abstract. Flux avalanches and it induced thermal stress (strain) in the superconducting film is investigated. Numerical simulation of the nonlinear and nonlocal electromagnetics of superconductors are performed by using the iteration scheme based on the fast Fourier transform technique. Local thermal stress and strain causing by the sharp increase of temperature during the dendritic avalanche process are obtained for the superconducting film subjected to an increasing magnetic field. n c c c J d J J J J T T otherwise E JHere, E is the electric field, J is the sheet current density, c J the critical sheet current density, n the creep exponent, 0 is a resistivity constant, T is the temperature, and c T the critical temperature. The temperature dependence of the critical current and flux creep exponent are 1 Corresponding author.

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“…For instance, ring-shaped superconductors are widely found as key components in devices (e.g., permanent magnets, superconducting quantum interferences device, and magnetic bearings) [22][23][24]. In addition, they present significantly different magnetic behavior compared to the simply connected counterparts, including the static flux penetration and the development of dynamic thermomagnetic instabilities [25][26][27]. Unlike avalanches observed in simply connected structures, multiply connected MgB 2 films (e.g., superconducting rings) have shown the presence of a crossing dendrite after several tree-like avalanches nucleate on the outer edge without reaching the inner rim [25].…”

Section: Introductionmentioning

confidence: 99%

Tunable domino effect of thermomagnetic instabilities in superconducting films with multiply-connected topological structures

et al. 2022

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Topology is a crucial ingredient for understanding the physical properties of superconductors. Magnetic field crowds to adopt the form of a 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 (SIS) multilayer structures of superconducting radio-frequency (SRF) cavities.

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Avalanches injecting flux into the central hole of a superconductingMgB2ring

Cited by 11 publications

References 37 publications

Flux distribution in superconducting films with holes

Flux distribution in superconducting films with holes

Thermomagnetic instability and correlated deformation in the type-II superconducting films

Tunable domino effect of thermomagnetic instabilities in superconducting films with multiply-connected topological structures

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