Abstract
The critical current of bronze processed multifilamentary Nb 3 Sn conductors was measured at 4.2 K up to 23 T. The flux pinning theory of Kramer does not fit the results at flux densities higher than about 18 T. The critical field B* c2 extrapolated from data below 18 T is smaller than the field B c2 at which superconductivity is completely suppressed. From independent measurements of the temperature dependence of B c2 on the same samples (using very small current) B c2 at 4.2 K can be calculated by applying the GLAG theory. A nonvanishing resistivity at fields close to B c2 is evidence of inhomogeneities which considerably broaden the transition.
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