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Dynamic force microscope image of the sample with (average particle size is ). Bottom panel presents dispersion profile of nanoparticles along the white line at the top.
The atomic-resolution high angle annular dark field (HAADF) scanning transmission electron microscopy (STEM) image of the sample with (average particle size is ) (left). The bright-field image of the same area (right).
An atomic-resolution high-angle annular dark-field (HAADF) scanning transmission electron microscope (STEM) image of the sample from Fig. 2.
Field dependence of super-current density of samples with refined by ball-milling for 0.3 to (200, 150, 100, and ). All the samples were measured at for axis (a). The experimental data (symbols) were fitted by Eq. (1) (the full lines). The decomposition into two contributions is shown in the inset. A remarkable super-current density was observed also at higher temperatures, at about liquid argon temperature, (b) and liquid oxygen temperature, (c).
The STEM-EDXHAADF results for sample with addition of (average particle size is ) . The diameter of the analyzed spot was .
The fitting parameters for dependence of sample with addition of of various average particle sizes measured at . The theoretical data of were calculated according to Eq. (1).
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