Critical behavior near the ferromagnetic-paramagnetic phase transition in La sub(0.65)Eu sub(0.05)Sr sub(0.3)Mn sub(1-x)Cr sub(x)O sub(3) (x=0.10 and x=0.15)

The critical properties of perovskite manganite La sub(0.65)Eu sub(0.05)Sr sub(0.3)Mn sub(1-x)Cr sub(x)O sub(3) (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 beta and gamma for La sub(0.65)Eu sub(0.05)Sr sub(0.3)Mn sub(1-x)Cr sub(x)O sub(3) (x=0.10) are consistent with the prediction of the mean field model. Furthermore, the estimated critical exponents of La sub(0.65)Eu sub(0.05)Sr sub(0.3)Mn sub(1-x)Cr sub(x)O sub(3) (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 T sub(C) were properly renormalized following the scaling of state equation M(H, epsilon ) = | epsilon | super( beta )f sub(+ or -)(H/| epsilon | super( beta + gamma )), where epsilon = (T - T sub(C))/T sub(C), f sub(+) for T > T sub(C) and f sub(-) for T < T sub(C). This confirms that the obtained values of the critical exponent as well as T sub(C) are reasonably accurate and unambiguous.