  We review the prediction, made in a previous work [Phys. Rev. B 52 (1995)],
that the phase diagram of type II superconductors consists of a topologically
ordered Bragg glass phase at low fields undergoing a transition at higher
fields into a vortex glass or a liquid. We estimate the position of the phase
boundary using a Lindemann criterion. We find that the proposed phenomenology
is compatible with recent experiments on superconductors.

Condensed Matter