Critical properties of perovskite manganite La0.88Sr0.12MnO3 nanocrystalline

The La0.88Sr0.12MnO3 nanocrystalline is synthesized by sol-gel chemical method, shows a typical paramagnetic-ferromagnetic phase transition at 280 K. A thorough study on critical behavior analysis of magnetization isotherms is performed by various techniques such as modified Arrott plot, Kouvel-Fisher method, and critical isotherm analysis. Based on these methods, the accurate critical exponents (beta = 0.5936(2) and gamma = 1.0928(6)) are determined. Both critical exponents (beta and gamma) have been confirmed to fulfill the Widom scaling relation delta = 1 + gamma/beta. Moreover, these exponents also obey the single scaling equation of H/M-delta = h(epsilon/H-1/beta). The obtained critical exponents are closer to the theoretical prediction of mean-field model but shows a slight deviation from theoretical values. We proposed that this deviation is due to the inherent disorder effect as the dimension of La0.88Sr0.12MnO3 particles reduced to nanoscale. [GRAPHICS] .