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Abstract
AC susceptibility, magnetotransport and specific heat measurements on single phase bulk polycrystalline Ba 0.6K 0.4BiO 3, with T c⋍31 K, are reported. The complex AC susceptibility, χ = χ′ + iχ″, measured in AC fields of 0.001–50 G rms, shows both intragrain and intergrain components characteristics of a granular superconductor, where the positions of the χ″ intra- and intergranular peaks are strongly field dependent. A value of 18 T is obtained for the upper critical field, H c2(0), from measurements of the superconducting resistive transition as a function of DC magnetic field. The coherence length, ξ(0), is determined to be 43 Å. Specific heat, C p, measurements from 0.5 to 20 K show no evidence of a term that has a linear temperature dependence or an upturn in C p/ T.
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