On the Phase Diagram of a “Superconductor Glass”

We compare the superconductor glass phase diagram in the ( H, T )-plane, deduced from computer simulations performed on a 2D system of superconducting clusters, with experiments performed on a LaSrCuO granular perovskite. It is shown that real high- T c granular systems in low fields ( ⩽ 10 G) are 3D and behave in a much more complicated manner than expected from an idealized model.