Ising-Model Critical Indices below the Critical Temperature

We review the estimates for the critical indices of the Ising model below T₂ and conclude (for 3 dimensions): ^'=0. 066-₀. ₀₄^_^+0. 16, =0. 312-₀. ₀₀₅^_^+0. 002, ^'=1. 310-₀. ₀₅^_^+0. 04 for the specific heat, magnetization, and magnetic susceptibility, respectively. For 2 dimensions, we estimate ^'=1. 75-₀. ₀₀^_^+0. 01. In order to explain previous estimates of ^'=0, we point out that a low power can, in practice, look deceptively like a logarithm. Finally, we discuss the behavior of the specific heat at constant magnetization.