VORTEX FLUCTUATIONS IN SUPERCONDUCTING THIN-FILM BRIDGES

The convection of the self-field vortices into the interior of a superconducting thin-film bridge is shown to generate a shot-noise voltage as well as a steady-state voltage. A basic relation is developed between the time correlation function for fluctuations in bridge voltage and the space correlation functions for the vortex number densities. Vortex motion is treated by a rudimentary plasma-dynamic model, and the results are used to derive a practical expression for the spectral intensity of the noise voltage. © 1969 The American Physical Society.