Integration method for visualization of the suppressed Josephson supercurrent

We present a method which allows to visualize the critical current when it appears suppressed and is unmeasurable. The method is based on the integration of the zero-bias peak observed in the differential conductance vs. bias curves. We have utilized this method for the measurement of those parts of the critical current IC(T) and IC(Φ) dependencies which are not measurable in the conventional way. The method helps us reveal phenomena related to the existence of 0–π-state in the Nb–Fe0.1Si0.9–Nb-Josephson junction. In general, the method can be used for the analysis of Josephson junctions under the conditions where the critical current is extremely small, like close to the critical temperature or in high applied magnetic fields.