Abstract
We have made grain boundary junctions of Ba/sub 1-x/K/sub x/BiO/sub 3/ thin film deposited on MgO bicrystal substrate. A high initial deposition temperature yielded superconductive Ba/sub 1-x/K/sub x/BiO/sub 3/ films from powder targets. We observed clear energy gap structure in the current-voltage characteristics of these junctions. In the high frequency radiation (10.5 GHz), Photon Assisted Tunneling was observed.
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