Is the mean-field approximation so bad? A simple generalization yelding realistic critical indices for 3D Ising-class systems
arXiv:cond-mat/0201147 · doi:10.1103/PhysRevB.66.052107
Abstract
Modification of the renormalization-group approach, invoking Stratonovich transformation at each step, is proposed to describe phase transitions in 3D Ising-class systems. The proposed method is closely related to the mean-field approximation. The low-order scheme works well for a wide thermal range, is consistent with a scaling hypothesis and predicts very reasonable values of critical indices.
4 pages