Critical behavior near the paramagnetic to ferromagnetic phase transition temperature in La0.67Sr0.1Ca0.23MnO3 compound.

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 (TC, b, g, and d) 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 (b ¼ 0.345 ± 0.001, g ¼ 1.31 ± 0.02 and TC ¼ 294.74 K for m0H ¼ 0e2 T. However,
b ¼0.354 ±0.004, g ¼1.28 ± 0.03 and TC¼ 294.75 K for m0H¼ 3e5 T). These critical exponents fulfill the Widom scaling relation d ¼ 1 þ g/b, implying the reliability of our values. Based on the critical exponents, the magnetization--field-temperature (Mem0HeT) data around TC collapses into two curves obeying the single scaling equation M(m0H,ε) ¼ |ε|b f±(m0H/|ε|bþg) where ε ¼ (T TC)/TC, fþ for T _ TC and f for T 3TC. A linear relationship DSmax M ðHÞfHn was achieved with a local exponent n ¼ 0.58 determined from n ¼ 1þ(b 1)/(b þ g), indicating a short-range FM system.