Antiproximity effect in aluminum nanowires with no applied magnetic field

The antiproximity effect, where the superconductivity in superconducting nanowires is suppressed or weakened when the wires are contacted by bulk superconducting electrodes, first revealed in arrays of Zn nanowires by tuning the electrodes from the superconducting to the normal state by means of an external magnetic field, has been confirmed in single-crystal aluminum nanowires. The critical current at zero magnetic field of an individual aluminum nanowire contacted by superconducting electrodes was found to be significantly smaller than that with normal electrodes, showing that the effect is not a consequence of the magnetic field.