Abstract
Ti-doped Sm–Sr based manganites (Sm0.6Sr0.4Mn1-xTixO3, x = 0, 0.1 and 0.15 denoted by S, S0.1, and S0.15 respectively) were prepared by the solid-state reaction method and the influence of Ti-doping at the Mn site on the structural, magnetic, and magnetocaloric properties were properly investigated. All the samples have orthorhombically distorted perovskite structures with pnma space group. S has peak magnetic entropy change 8.03Jkg−1K−1 at 100K for 14T magnetic field. For the same applied magnetic field, peak values of magnetic entropy change for S0.1 and S0.15 significantly reduce to 2.82 Jkg−1K−1 at 50K and 2.10 Jkg−1K−1 at 100K respectively. Relative cooling power (RCP) of S, S0.1, and S0.15 at 14T are 873Jkg-1, 271Jkg-1, and 204Jkg-1 respectively. Even though there is a reduction in RCP values, working temperature span (WTS) increases, and heat loss associated with magnetic hysteresis diminishes. Belov-Arrott plots and normalized magnetic entropy change curves suggest the presence of a field-induced first-order to second-order magnetic transition in the current samples.
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