Comment on "Experimental critical exponents of "pure" ferromagnets: the cost of excessive proximity to T_c may be too high" by M. D. Kuz'min and A. M. Tishin

Abstract

In a recent letter (Europhys. Lett., 73 (2006) 396), Kuz'min and Tishin claim that the previously reported results in the critical region on high-purity polycrystalline nickel and gadolinium single crystal are an artifact of the smearing of the ferromagnetic-to-paramagnetic phase transition by impurities. Contrary to this claim, we present conclusive experimental evidence to prove that the crossover phenomena in question are intrinsic to the systems concerned and occur in a temperature range (within the critical region) which lies well outside the temperature interval where the impurity-induced smearing is expected to become important.