Abstract
High-current critical/density lead-alloy tunnel junctions were fabricated with junction areas of less than 1 µm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . The relationship of junction quality, minimum resetting current I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</inf> , and energy-gap reduction to current critical/density J <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</inf> are investigated experimentally. The J <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</inf> dependence of I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</inf> is calculated taking into account the experimentally obtained quasi-particle current. The energy-gap reduction in high-J <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</inf> junctions is explained by calculating the nonequilibrium quasi-particle distribution in the junction area. These calculated results are compared with the experimental data.
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