Normal-State Resistance as the Determining Parameter in the Behavior of Dayem Bridges with Sinusoidal Current-Phase Relations

Abstract

We have shown experimentally that both the ac and dc properties of small Dayem bridges are fully determined at all temperatures by their normal-state Ohmic resistances. The behavior can be described by a two-fluid model where the normal component is governed by the normal-state resistance and the superfluid component determined by the two Josephson equations. The normal-state resistance also determines the maximum super-current.