Abstract
The resistivity of the GaSb–V2Ga5 eutectic is measured in a wide temperature range. It is found that, if the electric current is parallel to the whisker growth direction, the samples show metallic conductivity and undergo a superconducting transition at 4.1 K, independent of their geometry. If the electric current is perpendicular to the growth direction, the resistivity depends on the sample geometry and shows semiconducting behavior in the range 4.1–300 K, with a sharp drop or, in some of the samples, a superconducting transition at 4.1 K. The results are interpreted in terms of separate regions formed by superconductor–semiconductor–superconductor Josephson contacts, V2Ga5 superconducting whiskers, and infinite clusters of their combinations. It is suggested that, in a sequence of Josephson contacts, resonance tunneling of Cooper pairs along resonance percolation paths occurs.
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