Oscillations in the temperature dependence of Josephson supercurrents inSNSjunctions

Oscillations have been observed in the temperature dependence of the Josephson critical supercurrent of lead-zinc-lead ($\mathrm{SNS}$) junctions. These oscillations occur only in the presence of a magnetic field and the period decreases as the temperature approaches $T_c$. Model calculations indicate that this phenomenon is related to changes in the Fraunhofer diffraction pattern with temperature.