 UW-Madison MRSEC |
Magneto-Optic Imaging: Application to Superconductors |
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The extent, location, and
dynamics of magnetic flux penetration and/or magnetic
flux trapping is determined through analysis of the
magnetic field above zero-field cooled and field-cooled
samples, respectively. The center image at right shows
the pattern of flux exclusion above a polycrystalline
tape sample of the high-Tc superconductor
Bi2Sr2Ca2Cu3O10+x
in an applied magnetic field. Regions of higher magnetic
field strength image more brightly in this image. The
non-uniform flux exclusion in the sample is striking. The
bottom figure shows Jc contours in the sample,
where red represents high Jc regions and blue
low Jc regions. The microstructure of the high
and low Jc regions is identified by comparing
the Jc map with the light micrograph of the
same region of the sample. The highest Jc
regions are those near the silver- Bi2Sr2
Ca2Cu3O10+x interface,
indicating that the current flows percolatively in the sample.
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 Optical polarized light image of 2223-BSCCO/Ag tape made by two-powder process.
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