We present a new Monte Carlo renormalization-group approach to spin glasses. Application of this approach to the ±J Ising spin glass shows clear differences between two-, three-, and four-dimensional models. The data are consistent with a zero-temperature transition in two dimensions, and finite-temperature transitions in three and four dimensions.

• Received 9 October 1987

DOI:https://doi.org/10.1103/PhysRevB.37.7745