Critical behavior studies in ferromagnetic (Nd, K)–Mn–O compounds

The critical scaling behavior of K-doped Nd–Mn–O based double-exchange ferromagnetic compounds was studied by measuring isothermal magnetization of Nd0.84K0.16MnO3 and Nd0.77K0.23MnO3 samples. The critical exponents β, γ and δ corresponding to the spontaneous magnetization, initial susceptibility and isothermal magnetization, respectively, were determined by analyzing the magnetization data in terms of the modified Arrott plot method. The critical exponent values of both samples are found to be comparable to values predicted by a mean field model. The role of ferromagnetic clusters on the scaling behavior is discussed. The critical exponent values are found to be consistent with the Widom scaling relation and the universal scaling hypothesis.