Abstract
We have designed a new setup and analysis route based on the Campbell's methodfor measuring the critical current in superconductors. Our model takes consideration of the ceramics granular nature, the existence ofintergrain and intragrain currents. We obtain the variation of the pinning strength Pv as a function of p g, which is the radial position inside an average grain. We apply this scheme to Bi 1.77Pb 0.3Sr 2Ca 2Cu 3O10 -y ceramics synthesized by a vitreous route. The intragrain critical current is 10 5A/cm 2 at 40K with zero DC magnetic field. Some important increase of the pinning strength is observed near the grain surface.
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