Critical behavior near the ferromagnetic–paramagnetic phase transition in La0.65Eu0.05Sr0.3Mn1−xCrxO3 (x=0.10 and x=0.15)

Abstract

The critical properties of perovskite manganite La0.65Eu0.05Sr0.3Mn1−xCrxO3 (x=0.10 and x=0.15) around the paramagnetic–ferromagnetic phase transition are investigated through various techniques such as the modified Arrott plot, Kouvel–Fisher method, and critical isotherm analysis. The experimental results have revealed that the samples exhibited the second-order magnetic phase transition and the critical exponents of β and γ for La0.65Eu0.05Sr0.3Mn1−xCrxO3 (x=0.10) are consistent with the prediction of the mean field model. Furthermore, the estimated critical exponents of La0.65Eu0.05Sr0.3Mn1−xCrxO3 (x=0.15) are close to those found out by the 3D-Heisenberg model. The magnetization–field–temperature M–H–T behaviors of all compounds at below and above TC were properly renormalized following the scaling of state equation M(H,ε)=|ε|βf±(H/|ε|β+γ), where ε=(T−TC)/TC, f+ for T>TC and f− for T<TC. This confirms that the obtained values of the critical exponent as well as TC are reasonably accurate and unambiguous.