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Electron scattering dependence of dendritic magnetic instability in superconducting films
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View: Figures


Image of FIG. 1.
FIG. 1.

Magneto-optical images showing flux penetration patterns in the zero-field-cooled C-doped and ultrapure films at : (a) dendritic flux penetration into the C-doped film at ; (b) remanent state of the C-doped film showing the exit of the dendritic flux after reduced from to zero; (c) stable and gradual flux penetration into the ultrapure film at . Note: at , nearly perfect shielding (no flux entry) was observed; (d) remanent state of the ultrapure film showing regular roof-top flux trapping pattern after reduced from to zero.

Image of FIG. 2.
FIG. 2.

Initial magnetization of the C-doped and ultrapure films. The inset is an expanded view of the magnetization curve for the C-doped film at , showing pronounced noise due to flux jumps. A regular magnetization behavior was observed for the ultrapure film at all temperatures from to , as well as for the C-doped film at .

Image of FIG. 3.
FIG. 3.

Temperature dependence of for the C-doped and ultrapure films determined by the transport (Tran.) and magnetization (Mag.) methods.

Image of FIG. 4.
FIG. 4.

Temperature dependence of resistivity of the C-doped and ultrapure films plotted along with the pure film made by PLD (Refs. 5 and 16).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electron scattering dependence of dendritic magnetic instability in superconducting MgB2 films