Abstract
The critical behavior of La0.67Sr0.1Ca0.23MnO3 perovskite-manganite was studied around its Curie temperature (TC). Experimental results revealed that this sample underwent a second-order phase transition. Using modified Arrott plot, Kouvel-Fisher method and critical isotherm analysis, the critical parameters (T-C, beta, gamma, and delta) were determined in the two characteristic regions of low-and high-magnetic fields. The estimated critical exponents were close to those expected for three-dimensional Heisenberg class for LSCMO (beta = 0.345 +/- 0.001, gamma = 1.31 +/- 0.02 and T-C = 294.74 K for mu H-0 = 0-2 T. However, beta = 0.354 +/- 0.004, gamma = 1.28 +/- 0.03 and T-C = 294.75 K for mu H-0 = 3-5 T). These critical exponents fulfill the Widom scaling relation delta = 1 + gamma/beta, implying the reliability of our values. Based on the critical exponents, the magnetization-field-temperature (M-mu H-0-T) data around TC collapses into two curves obeying the single scaling equation M(mu H-0, epsilon) = vertical bar epsilon vertical bar(beta) integral(+/-)(mu H-0/vertical bar epsilon vertical bar(beta+gamma)) where epsilon = (T - T-C)/ T-C, integral(+) for T > T-C and integral(-) for T 3 T-C. A linear relationship vertical bar Delta S-max(M)vertical bar proportional to H-n was achieved with a local exponent n = 0.58 determined from n = 1+(beta - 1)/(beta + gamma), indicating a short-range FM system. (C) 2016 Elsevier B.V. All rights reserved.