The influence of Ti doping at the Mn site on structural, magnetic, and magnetocaloric properties of Sm0.6Sr0.4MnO3

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. [Display omitted] •Ti-doped Sm–Sr based manganites are prepared using solid state reaction method.•Samples have orthorhombically distorted perovskite structure with pnma space group.•Ti doping reduces -ΔS values but increases working temperature span (WTS).•As the Ti-doping concentration increases, heat released due to magnetic hysteresis reduces.•15% Ti doped sample needs less magnetic field to achieve the field-induced first order to second order magnetic transition on comparison with the other two samples.