Corrections to scaling above and below T c in the ferromagnetic regime of an S-K like model

Abstract

We present calculations of the effective order parameter exponent β ∗(T) and of the exponent δ ∗(H), within the ferromagnetic regime of a mean effective field Ising model. These calculations cover not only the usual zero-field isochamp and the critical isotherm, but also the cross-over line above T c. The model is capable of replicating the systematic variation of β ∗(T) immediately below the critical point both as a function of temperature and bond disorder, as well as the field and disorder dependence of δ ∗(H), observed experimentally in both amorphous and crystalline ferromagnets with quenched disorder.