CRITICAL CURRENT STUDIES OF FLUX TRAPPING IN SUPERCONDUCTING LEAD AND LEAD ALLOYS.
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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A convenient critical current method for observing the salient features of flux-trapping in superconductors was used to study a variety of lead Pb and lead-alloy samples. The critical fields H sub i, H sub a, and H sub c for type I and H sub c2 for type II superconductors were obtained and found to be in accord with the results of other investigators employing different techniques. Because of self fields due to current asymmetries, the full critical currents of some samples are observed in nonzero applied fields. The critical current vs applied magnetic field characteristics of lead pressure contacts and their application to a simple magnetic null detector are discussed. It was found that trapping flux in certain solid specimens can cause a fourfold enhancement of the peak critical current. Author
- Electricity and Magnetism