Large magnetic entropy change and prediction of magnetoresistance using a magnetic field in La(0.5)Sm(0.1)Sr(0.4)Mn(0.975)In(0.025)O(3)

A detailed study of the structural, magnetic, magnetocaloric and electrical effect properties in polycrystalline manganite La(0.5)Sm(0.1)Sr(0.4)Mn(0.975)In(0.025)O(3) is presented. The X-ray diffraction pattern is consistent with a rhombohedral structure with R3̄c space group. Experimental results revealed that our compound prepared via a sol–gel method exhibits a continuous (second-order) ferromagnetic (FM) to paramagnetic (PM) phase transition around the Curie temperature (T(C) = 300 K). In addition, the magnetic entropy change was found to reach 5.25 J kg(−1) K(−1) under an applied magnetic field of 5 T, corresponding to a relative cooling power (RCP) of 236 J kg(−1). We have fitted the experimental data of resistivity using a typical numerical method (Gauss function). The simulation values such as maximum resistivity (ρ(max)) and metal–semiconductor transition temperature (T(M–Sc)), calculated from this function, showed a perfect agreement with the experimental data. The shifts of these parameters as a function of magnetic field for our sample have been interpreted. The obtained values of β and γ, determined by analyzing the Arrott plots, are found to be T(C) = 298.66 ± 0.64 K, β = 0.325 ± 0.001 and γ = 1.25 ± 0.01. The critical isotherm M (T(C), μ(0)H) gives δ = 4.81 ± 0.01. These critical exponent values are found to be consistent and comparable to those predicted by the three-dimensional Ising model with short-range interaction. Thus, the Widom scaling law [Image: see text] is fulfilled.