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Critical current as a function of temperature for irradiation doses 3 and : Two wide samples are displayed for each, and the solid lines are quadratic fits. Inset: current vs bias curves of a wide bridge irradiated with at different temperatures (, 31, 32, 33, 36, and 40 K from top to bottom). At a high temperature, the upward curvature refers to RSJ-like behavior of a JJ. At a low temperature, the downward curvature is characteristic of a flux-flow regime. The arrow indicates estimated from this diagram.
Critical current as a function of the applied magnetic field on a wide junction irradiated at , for different temperatures. Taking the zero-temperature London penetration depth as 140 nm, is calculated to be , , and for , 72.5 K, and 73.5 K, respectively. Self-field effects show up when becomes of the order of the junction width. The solid line is a fit to a perfect Fraunhofer pattern for a rectangular junction in the small junction limit. The insert is a schematic side view of the irradiation process.
Resistance as a function of temperature for a wide microbridge irradiated at , computed with a 80 nm long junction (dotted line) or a 40 nm long one (solid line). The absolute value of has been adjusted within 5%. Inset (b): Blow-up of the main figure. Inset (a): for two wide bridges irradiated with 3 and , respectively. The Josephson behavior is observed between and , shown here for the lower fluence.
Typical parameters for wide junctions.
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