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

Abstract The critical scaling behavior of K-doped Nd–Mn–O based double-exchange ferromagnetic compounds was studied by measuring isothermal magnetization of Nd 0.84 K 0.16 MnO 3 and Nd 0.77 K 0.23 MnO 3 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.