Physics – Condensed Matter – Superconductivity
Scientific paper
2003-03-16
Physica C 390/2 pp 127-133 2003
Physics
Condensed Matter
Superconductivity
PDF (8 pages, 4 figures)
Scientific paper
10.1016/S0921-4534(03)00629-4
The downsizing 211-inclusions and an increase of their density leads to rise in mean critical current value in Y-based melt textured material. Very often 211-inclusion are spread in the material volume non-homogeneous, with typical scale 50 - 100 micrometer. Therefore it is difficult to find the real correlation between local critical current and the inclusions distribution. We performed a study of a local critical current using modified magneto-optic technique on a melt-textured YBaCuO ceramic, found the areas with constant current and studied the real structure of the material in the areas, inclusions distribution and their sizes, by scanning electron microscopy and X-ray microanalysis. The estimation of a pinning in these places, by taking into account the amount of inclusions and the length of their boundaries, and comparison with the value of local critical current reveals a strait correlation between the density of inclusions and the current but shows remarkable quantitative disagreement.
Boguslavskii Yu. B.
Caplin A. D.
Emel'chenko G. A.
Gawalek Wolfgang
Litzkendorf Doris
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