Visualizing Current in Superconducting Networks

We present an experimental study of local magnetic imaging in order to visualize the current flow in
superconducting networks. We track the evolution of the spatial distribution of the current flow as the
network is driven from fully superconducting to fully normal phases. Our results highlight the factors
that contribute to the disordered flow in superconducting networks during their collapse, and demonstrate
that the current is never uniformly distributed in the network. These results can assist the design and
development of circuits based on superconductors and Josephson junctions.