Stability of the current-carrying state in nonhomogeneous MgB<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>films

Treiber, S.; Stahl, Claudia; Schütz, Gisela; Albrecht, J.

doi:10.1103/physrevb.84.094533

Cited by 16 publications

(24 citation statements)

References 27 publications

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“…1 for a review. This dramatic avalanche phenomenon has been observed in films of many materials, such as Nb23, YBa 2 Cu 3 O x 4567, Pb8, MgB 2 9101112131415, Nb 3 Sn16, YNi 2 B 2 C17, NbN1819, and very recently also in α -MoGe20. It is today widely accepted that such events originate from a thermoelectromagnetic instability21, where an initial fluctuation sets some flux in motion and the dissipative displacement increases the local temperature.…”

mentioning

confidence: 83%

Lightning in superconductors

Vestgården

Shantsev

Galperin

et al. 2012

Sci Rep

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Crucially important for application of type-II superconductor films is the stability of the vortex matter – magnetic flux lines penetrating the material. If some vortices get detached from pinning centres, the energy dissipated by their motion will facilitate further depinning, and may trigger a massive electromagnetic breakdown. Up to now, the time-resolved behaviour of these ultra-fast events was essentially unknown. We report numerical simulation results revealing the detailed dynamics during breakdown as within nanoseconds it develops branching structures in the electromagnetic fields and temperature, with striking resemblance of atmospheric lightning. During a dendritic avalanche the superconductor is locally heated above its critical temperature, while electrical fields rise to several kV/m as the front propagates at instant speeds near up to 100 km/s. The numerical approach provides an efficient framework for understanding the ultra-fast coupled non-local dynamics of electromagnetic fields and dissipation in superconductor films.

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confidence: 83%

Lightning in superconductors

Vestgården

Shantsev

Galperin

et al. 2012

Sci Rep

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“…The process leading to these results has already been shown in Ref. [12]. Two regions exhibiting a constant critical current density each can be distinguished in the image.…”

Section: Introductionmentioning

confidence: 66%

“…The homogenous section of the film exhibits an about five times larger critical current density than the inhomogeneous part. This is related to the limiting influence of the film regions with cracks where only a fraction of the critical current can be carried compared to the rest of the film [9,12]. However, a nearly perfect fit of the current density data can be performed when applying a power-law model j c $ (1 À T/T c ) 3/2 which is to be expected for the pinning of the normal cores of magnetic vortices [2,13].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of the dissipation-free current transport in inhomogeneous MgB 2 thin films

Treiber

Stahl

Schütz

et al. 2014

Physica C: Superconductivity and its Applications

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“…A role in development of TMI played by macro-defects, i.e., those disrupting the current flow, was recently studied in an inhomogeneous MgB 2 film. 17 Edge defects and especially cracks in such specimens tend to "concentrate" and lead magnetic flux into the sample. 18 In essence, they act as sources of strong electric field triggering the avalanches.…”

mentioning

confidence: 99%