High-precision evaluation of the static exponents of the classical Heisenberg ferromagnet

A high-precision, multimethod Monte Carlo study of the static exponents of the O(3) classical Heisenberg ferromagnet yields an estimate for the critical temperature of T-c approximate to 1.4427 +/- 0.0002 s from which it is conjectured that T-c = 1/ln(2). It is shown from finite-size scaling of the data that the specific heat is singular for this model, with alpha = 0.0750 +/- 0.002, nu = 0.642 +/- 0.002, beta = 0.328 +/- 0.001, and gamma = 1.270 +/- 0.001. This result is confirmed by comparing the universality scaling of the full order parameter curve for three possible values of nu.