CRITICAL-BEHAVIOR OF THE COULOMB GLASS

We have performed a Monte Carlo study of a classical three dimensional Coulomb glass. We use finite size scaling to demonstrate the existenc e of a spin-glass-like phase transition and determine its critical exp onents. We find that the transition temperature is well below the bare energy scale; we attribute this to pairs of nearby sites binding into weakly interacting effective dipoles. We have also studied the densit y of states as a function of temperature, we find that the Coulomb gap begins to develop well above the transition temperature and is nearly fully formed at T(c).