Abstract
An evaporation technique is described for the preparation of thin-film superconducting weak links with a width smaller than 1 mu m and tunnel junctions with area smaller than 1 mu m*20 mu m. The technique utilizes two precision spheres for ball bearings with diameter 390+or-1 mu m. The spheres are ground and polished to hemispheres and placed in a mechanical arrangement in such a way that it is possible to place them less than 1 mu m apart on a glass substrate. The evaporation takes place between the two hemispheres on the glass substrate. Examples of (I,V) characteristics and the influence of microwaves are shown.
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