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Normalised voltage drop as a function of the normalised current density for SNs of widths w = 6, 9, 12, and 18 with a magnetic field . The black and red dots (for w = 6 and 12, respectively) mark the values of the current density at which the analysis of the modulation frequency spectra are presented in Figure 9 and Figure 11. Inset: Snapshots of the Cooper-pair density for a SN of w = 12, numbered 1–10 from left to right, are indicated by open red squares.
