Putting a pair of these devices in parallel creates a device used to measure very weak magnetic fields.
The I-V curve of one of these devices shows a vertical jump named for Shapiro. In one model of these devices, they are governed by a parameter theta that "slides" down a washboard potential. Considering the phase angle of these devices as equivalent to the angle of displacement of a pendulum leads to an equation in which these devices are damped by the Stewart- McComber parameter. Putting a pair of these devices in parallel creates a device used to measure very weak magnetic fields. A constant of proportionality governing this effect is equal to one over the flux quantum. For 10 points, name these devices that operate using a namesake effect in which Cooper pairs tunnel across a junction of superconductors.
The I-V curve of one of these devices shows a vertical jump named for Shapiro.
Josephson junction