Abstract
Abstract The theories on tunneling and metallic Josephson junctions in equilibrium are reviewed. It is shown that the most commonly used criterion for determining whether an intrinsic junction is of the tunneling or metallic (weak link) type, the temperature dependence of the critical current, is not efficient for this purpose. A new criterion, based on the nonequilibrium current-voltage characteristics (CVC), is proposed. It is shown that, in the sub-gap voltage range, the CVC of each kind of junction is different and there is no ambiguity in the junction-type determination.
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