Fig. 5: Locally resolved Josephson effect.
From: Single channel Josephson effect in a high transmission atomic contact
a Map of the normal state conductance GN (\({R}_{{\rm{N}}}={G}_{{\rm{N}}}^{-1}\)) around an impurity on Al(100) measured at constant height. b Map of the current maximum Is of the Josephson peak at a bias voltage of V = 14 μV under the same conditions as in a. c Map of the ICRN product. The critical current IC is extracted from b through \({I}_{{\rm{C}}}\propto \sqrt{{I}_{{\rm{s}}}}\). The data are normalized to the average value. d Map of the ICRN product calculated from the arbitrary transmission model (Eqs. (4)–(7)). The variations in the ICRN product are due to the non-linear dependence of IC on RN. The gap parameter Δ is expected to be constant. All maps have a size of 2.2 nm × 2.2 nm.
