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