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Upper critical field in Ba <sub> 1 โ <i>x</i> </sub> K <sub> <i>x</i> </sub> BiO <sub>3</sub> : Magnetotransport <i>vs.</i> magnetotunneling
Elastic tunneling is used as a powerful direct tool to determine the upper critical field Hc2(T) in the high-Tc oxide Ba1 โ xKxBiO3. The temperature dependence of Hc2 inferred from the tunneling follows the Werthamer-Helfand-Hohenberg prediction for type-II superconductors. A comparison will be made with resistively determined critical-field data.