Abstract

We study the Josephson current through a ballistic normal metal layer of thickness D, on which two superconducting electrodes are deposited within a distance L of each other. In the presence of an
in-layer magnetic field, we find that the oscillations of the critical current Ic

with the magnetic flux
are significantly different from an ordinary magnetic interference pattern. Depending on the ratio L/D and temperature, Ic

oscillations can have a period smaller than flux quantum
0, nonzero minima, and damping rate much smaller than 1/
. A similar anomalous magnetic interference pattern was recently observed experimentally.