Critical Exponents and Magnetocaloric Effect in La0.7Sr0.3Mn1−xTixO3 (x = 0 and 0.05) Compounds

Abstract

The critical exponents and magnetocaloric properties of La0.7Sr0.3Mn1−xTixO3 with x = 0 and 0.05 have been explored via magnetic measurements. The magnetic data analyzed in the critical region by using modified Arrott plots, the Kouvel–Fisher method, and the scaling hypothesis reveal values for the critical parameters of β = 0.3165 and 0.3027, γ = 1.1121 and 1.203, and δ = 4.7556 and 4.833 for x = 0 and x = 0.05 respectively. These values are in agreement with the three-dimensional (3D) Ising model. The n values obtained from the law \( \Delta S_{\rm{max} } = a(\mu_{0} H)^{n} \) are 0.648 and 0.685. The maximum values of the magnetic entropy change are 1.65 J/kg K and 1.46 J/kg K under a magnetic field change of 10 kOe for x = 0.00 and 0.05, respectively. These results can be explained in the scenario of the short-range interaction and the phase separation as well as the diluted magnetic effect in manganites.