Figure 7

Fit of the measured oscillations of the current steps of point contact No. 1 (symbols) by means of the dependencies calculated from the RSJ model, reported in Eq. (1), by using \(\Omega _\varphi =0.15\) (\(I_s=I_c\sin (\varphi )\), solid blue line) and \(\Omega _{2 \varphi }=0.34\) (\(I_s=I_c\sin (2 \varphi )\), dash magenta line). \(\Omega _\varphi\) and \(\Omega _{2 \varphi }\) were determined from the graph of Fig. 6. The abscissae of graphs \(i_n^{exp}(k^* \sqrt{P})\) and \(i_n^{calc- 2\varphi }(h^* i_{ac})\) were scaled by the coefficients \(k^*=2.76\) and \(h^*=1.15\), respectively, to have the first minimum of all dependencies \(i_1\) coincident.