Fig. 2
From: Induced superconductivity in hybrid Au/YBa2Cu3O7−x electrodes on vicinal substrates
Surface morphology and spectroscopic properties of the Au/YBCO surface. (a) Scanning tunneling micrograph of an Au/YBCO heterostructure on a vicinal NGO substrate (upper panel) and surface profiles along and perpendicular to the terraces (red and blue dotted arrows) (Vset = 1 V, Iset = 130 pA). The inset shows a scanning electron micrograph of an Au/YBCO heterostructure cross-section. The NGO substrate, YBCO film, Au film, and electron beam deposited Pt film are numbered 1, 2, 3, and 4, respectively. (b) Differential conductance spectra taken at different positions of the sample. The spectra are offset vertically for clarity. The inset shows the measurement points (Vset = 100 mV, Iset = 2 nA, Vmod = 1 mV). The colour of each dot corresponds to the colour of the differential conductance spectra taken at this point. The extracted gap values are shown in the upper insert.
