SCALING ANALYSIS OF AMORPHOUS FE90-XMNXZR10 ALLOYS NEAR THE PARAMAGNETIC-TO-FERROMAGNETIC TRANSITION - COMMENT

In a recent paper, Nicolaides et al. [Phys. Rev. B 48, 12759 (1993)] have carried out the scaling-equation-of-state (SES) analysis of the magnetization data taken on amorphous Fe90-xMnxZr10 (X = 1.2,5.0) alloys in the temperature region near the paramagnetic-ferromagnetic phase transition and obtained values for the critical exponents beta, gamma, and delta that are extremely large compared to those predicted by the three-dimensional nearest-neighbor Heisenberg model. In the present comment, it is argued that the anomalously large exponent values, far from being the asymptotic values (which the theory predicts), are the average (temperature-dependent) values of the effective critical exponents beta(eff) and gamma(eff) that the SES analysis of the data taken outside the asymptotic critical region yields.