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SEM images of the sample surfaces are shown in (a) (sample A) and (b) (sample B) for the corresponding samples A and B. Sample A exhibits a clear nano-crystalline structure. (c) and (d) show the temperature dependence of the sheet resistances for the two samples including the enlarged transition to the superconducting state in the individual insets.
Magneto-optical images of flux distribution at in sample A (left panel) in magnetic field (a) and in the remanent state after reaching the maximum field (b); in sample B (right panel), in magnetic field (c) and in the remanent state after reaching the maximum field (d).
Magneto-optical images of flux distribution at K in sample A (a) in magnetic field , and sample B (b) in magnetic field . Insets show differential MO images of the selected areas.
Comparison of characteristic measures for sample A and sample B.
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