  A full mean field solution of a quantum Heisenberg spin glass model is
presented in a large-N limit. A spin glass transition is found for all values
of the spin S. The quantum critical regime associated with the quantum
transition at S=0, and the various regimes in the spin glass phase at high spin
are analyzed. The specific heat is shown to vanish linearly with temperature.
In the spin-glass phase, intriguing connections between the equilibrium
properties of the quantum problem and the out-of-equilibrium dynamics of
classical models are pointed out.
