Dendritic magnetic instability in superconducting MgB2 films

Abstract

Magneto-opitcal studies of a c-oriented epitaxial MgB2 film show that below 10 K the global penetration of vortices is dominated by complex dendritic structures abruptly entering the film. We suggest that the observed behavior is due to a thermo-magnetic instability which is supported by vortex dynamics simulations. The instability is also responsible for large fluctuations in the magnetization curves in MgB2 at low temperatures.

Extended version: 4 pages, 7 figures, submitted to PRL, for high-quality MO images see http://www.fys.uio.no/faststoff/ltl/results/biology/index.html

References in corpus (4)

• MgB2 superconducting thin films with a transition temperature of 39 Kelvin
• Suppression of Superconducting Critical Current Density by Small Flux Jumps in $Mg{B}_2$ Thin Films
• Vortex avalanches and magnetic flux fragmentation in superconductors
• Flux Jumping and a Bulk-to-Granular Transition in the Magnetization of a Compacted and Sintered MgB2 Superconductor

Cited by in corpus (45)

• Experiments in vortex avalanches
• Very strong intrinsic supercurrent carrying ability and vortex avalanches in (Ba,K)Fe2As2 superconducting single crystals
• Dendritic and uniform flux jumps in superconducting films
• Dendritic flux avalanches and nonlocal electrodynamics in thin superconducting films
• Onset of dendritic flux avalanches in superconducting films
• Dynamics of vortex penetration, jumpwise instabilities and nonlinear surface resistance of type-II superconductors in strong rf fields
• Finger patterns produced by thermomagnetic instability in superconductors
• Neutron Stars in the Laboratory
• Dendritic flux avalanches in superconducting Nb3Sn films
• Dynamics and morphology of dendritic flux avalanches in superconducting films
• Avalanche-driven fractal flux distributions in NbN superconducting films
• Multilayer coating for higher accelerating fields in superconducting radio-frequency cavities: a review of theoretical aspects
• Vortex avalanches and self organized criticality in superconducting niobium
• Dendritic flux penetration in Pb films with a periodic array of antidots
• Dramatic role of critical current anisotropy on flux avalanches in MgB2 films
• Local threshold field for dendritic instability in superconducting MgB2 films
• Exceeding the Landau superflow speed limit with topological Bogoliubov Fermi surfaces
• Size of flux jumps in superconducting films
• From the second magnetization peak to peak effect. A study of superconducting properties in Nb films and MgB2 bulk samples
• Nucleation and propagation of thermomagnetic avalanches in thin-film superconductors
• Quantitative magneto-optical investigation of superconductor/ferromagnet hybrid structures
• Collapse of the critical state in superconducting niobium
• Evidence of rf-driven branching of dendritic vortex avalanches in MgB2 microwave resonators
• On ultrafast magnetic flux dendrite propagation into thin superconducting films
• Ray optics in flux avalanche propagation in superconducting films
• Electron scattering dependence of dendritic magnetic instability in superconducting MgB2 films
• Thermally driven inhibition of superconducting vortex avalanches
• Cascade dynamics of thermomagnetic avalanches in superconducting films with holes
• Oscillatory regimes of the thermomagnetic instability in superconducting films
• Flux Dendrites of Opposite Polarity in Superconducting MgB${}_2$ rings observed with magneto-optical imaging
• The thermomagnetic instability in superconducting films with adjacent metal layer
• Diversity of flux avalanche patterns in superconducting films
• Flux avalanches in Nb superconducting shifted strip arrays
• Vortex dynamics and second magnetization peak in PrFeAsO${}_{0.60}$F${}_{0.12}$ superconductor
• Vortex microavalanches in superconducting Pb thin films
• Interplay of dendritic avalanches and gradual flux penetration in superconducting MgB2 films
• Dendritic flux avalanches in a superconducting MgB2 tape
• Roles of intrinsic anisotropy and pi-band pairbreaking effects on critical currents in tilted c-axis MgB2 films probed by magneto-optical and transport measurements
• Instability of vortex-antivortex interface in optimally-doped Ba(Fe_{1-x}Co_{x})_{2}As_{2}
• Mesoscopic flux jumps in MgB2 films visualized by magneto-optical imaging
• Magnetic flux penetration in nanoscale wedge-shaped superconducting thin films
• Dynamics and stability of vortex-antivortex fronts in type II superconductors
• Transformation of the trapped flux in a SC disc under electromagnetic exposure
• Dendritic flux avalanches in superconducting films of different thickness
• Thermally-controlled flux avalanche dynamics in bulk NbTi superconductor