Publisher's Note: Dendritic and uniform flux jumps in superconducting films [Phys. Rev. B<b>73</b>, 014512 (2006)]

Denisov, D. V.; Rakhmanov, A. L.; Shantsev, D. V.; Galperin, Y. M.; Johansen, T. H.

doi:10.1103/physrevb.73.069903

Cited by 35 publications

(62 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A viable alternative to obtain information about the spatial and temporal evolution of the dendritic flux avalanches is to carry out simulations of their dynamics. The origin of dendritic avalanches in superconducting films is a thermomagnetic instability mechanism due to the Joule heating created by vortex motion and the consequent reduction of the critical current density as the temperature increases [5,35]. The instability is also a consequence of the nonlinear material characteristics of type II superconductors, which is conventionally approximated by a power law…”

Section: Modelingmentioning

confidence: 99%

“…Besides, since high electric fields are known to trigger thermomagnetic avalanches [6,15,16], it is thus likely that thin superconductors with concave corners are far more susceptible to the occurrence of such dramatic events than specimens with convex corners or without corners at all. Notice that this concept applies equally to a superconductor with a square hole filled with flux: if the magnetic pressure pushes the flux trapped in the hole to invade the superconducting frame, it would thus have preferential directions, defined by the inner corners.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Controllable morphology of flux avalanches in microstructured superconductors

et al. 2014

Self Cite

View full text Add to dashboard Cite

The morphology of abrupt bursts of magnetic flux into superconducting films with engineered periodic pinning centers (antidots) has been investigated. Guided flux avalanches of thermomagnetic origin develop a tree-like structure, with the main trunk perpendicular to the borders of the sample, while secondary branches follow well-defined directions determined by the geometrical details of the underlying periodic pinning landscape. Strikingly, we demonstrate that in a superconductor with relatively weak random pinning, the morphology of such flux avalanches can be fully controlled by proper combinations of lattice symmetry and antidot geometry. Moreover, the resulting flux patterns can be reproduced, to the finest details, by simulations based on a phenomenological thermomagnetic model. In turn, this model can be used to predict such complex structures and to estimate physical variables of more difficult experimental access, such as the local values of temperature and electric field.

show abstract

Section: Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controllable morphology of flux avalanches in microstructured superconductors

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…6 It has been demonstrated that the insertion of arrays of ADs in a superconducting film can lead, at high temperatures, to an increase of the critical current. 6 Unfortunately, at low temperatures, such PCs facilitate the proliferation of flux channeling [7][8][9][10] leading to unwanted instabilities of thermomagnetic origin 11,12 which render the superconductor impractical. A good compromise between strong pinning and lack of channeling can be achieved by introducing a quasiperiodic array of PCs, as suggested theoretically by Misko et al [13][14][15] and confirmed experimentally by Kemmler et al 16 and Silhanek et al 17 This aperiodic distribution of pinning centers may be further optimized by matching it to the typically non-uniform distribution of vortices.…”

mentioning

confidence: 99%

Enhanced pinning in superconducting thin films with graded pinning landscapes

Motta

Colauto

Ortiz

et al. 2013

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

A graded distribution of pinning centers (antidots) in superconducting MoGe thin films has been investigated by magnetization and magneto-optical imaging. The pinning landscape has maximum density at the border, decreasing progressively towards the center. At high temperatures and low fields, where this landscape mimics the vortex distribution predicted by the Bean model, an increase of the critical current is observed. At low temperatures and fields, the superconducting performance of the non-uniform sample is also improved due to suppression of thermomagnetic avalanches. These findings emphasize the relevance of non-uniform pinning landscapes, so far experimentally unexplored, on the enhancement of pinning efficiency.

show abstract

“…However, the mechanism has recently also been shown to give localised, fingering instabilities. 14,15 Indeed, the instability threshold field predicted from this model was recently 16 shown to agree quantitatively with measurements in both Nb and MgB 2 films.…”

Section: Introductionmentioning

confidence: 59%

Avalanches injecting flux into the central hole of a superconductingMgB2ring

Olsen¹,

Johansen²,

Shantsev³

et al. 2007

Phys. Rev. B

View full text Add to dashboard Cite

Magneto-optical imaging was used to observe dendritic flux avalanches connecting the outer and inner edges of a ring-shaped superconducting MgB2 film. Such avalanches create heated channels across the entire width of the ring, and inject large amounts of flux into the central hole. By measuring the injected flux and the corresponding reduction of current, which is typically 15 %, we estimate the maximum temperature in the channel to be 100 K, and the duration of the process to be on the order of a microsecond. Flux creep simulations reproduce all the observed features in the current density before and after injection events.

show abstract

Publisher's Note: Dendritic and uniform flux jumps in superconducting films [Phys. Rev. B73, 014512 (2006)]

Cited by 35 publications

References 0 publications

Controllable morphology of flux avalanches in microstructured superconductors

Controllable morphology of flux avalanches in microstructured superconductors

Enhanced pinning in superconducting thin films with graded pinning landscapes

Avalanches injecting flux into the central hole of a superconductingMgB2ring

Contact Info

Product

Resources

About