Suppression of superconductivity in zinc nanowires by bulk indium superconductors

The transport properties were measured in a system consisting of a zinc nanowire array sandwiched between two bulk superconductors. It was found that the superconductivity of Zn nanowires of 40 nm diameter is suppressed either completely or partially by the bulk superconductors. When the latter are driven into their normal state by a magnetic field, the nanowires switch back to their superconducting state. This novel phenomenon is not seen in wires with diameters equal to or thicker than 70 nm.