Abstract
A mechanically controllable break junction is used to obtain the smallest possible Josephson junction, formed by two superconducting electrodes, which are separated by a thin subatomic vacuum barrier. The current voltage characteristics show a “skew supercurrent”, a supercurrent-like feature with a finite resistance and a “critical skew current value” I t at a finite voltage V t. The skew supercurrent is examined over a large normal resistance range by adjustment of the vacuum barrier thickness. In the studied range of six orders of magnitude of the junction normal resistance a crossover from a clear zero voltage supercurrent to a skew supercurrent is observed, for which V t remains constant.
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