Critical Behavior Near the Paramagnetic to Ferromagnetic Phase Transition Temperature in Sr1.5Nd0.5MnO4 Compound

Abstract

The magnetic properties and the critical behavior in Sr 1.5 Nd 0.5 MnO 4 have been investigated by magnetization measurements. The magnetic data indicate that the compound exhibits a second-order phase transition. The estimated critical exponents derived from the magnetic data using various techniques such as modified Arrott plot, Kouvel-Fisher method, and critical magnetization isotherms M (T C , H ). The critical exponent values for this compound was found to match well with those predicted for the mean-field model ( = 2.212 0.124, = 0.975 0.018, and = 0.502 0.012) at T C = 228.59 0.17. The critical exponent is slightly inferior than predicted from the mean-field model. Such a difference may be due, within the context of the quenched disorder and essentially the presence of the Griffiths phase. The temperature variation in the effective exponent ( eff ) is similar to those for disordered ferromagnets.