The critical properties of the mixed manganite La0.67–xYxBa0.23Ca0.1MnO3 withx=0.10 andx=0.15 around the paramagnetic (PM)-ferromagnetic (FM) phase transition were investigated through various techniques. These involved modified Arrott plots, Kou-vel-Fisher method and Widom scaling relation. Magnetic data, analyzed in the critical region, using the above methods, yielded the critical exponents for (x=0.10) La0.57Y0.10Ba0.23Ca0.1MnO3 (β=0.312±0.002 andγ=1.147±0.003 atTC=299.23±0.05 K). Moreover, the estimated critical exponents of (x=0.15) La0.52Y0.15Ba0.23Ca0.1MnO3 wereβ=0.286±0.004 andγ=0.943±0.002 atTC=289.53±0.06 K. The critical exponents’ values were close to the theoretical values of 3D-Ising model and tricritical mean-field model. These results suggested that the present composition should be close to a tricritical point in the La0.67–xYxBa0.23Ca0.1MnO3 phase diagram. Express-ing the field dependence asΔSM∝Hn allowed us to establish a relationship between the exponentn and the critical exponents of the material and to propose a phenomenological universal curve for the field dependence ofΔSM.
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