Magnetic properties and universal behaviour of magnetocaloric effect for polycrystalline [formula omitted] compound.

In the present study, we have systematically investigated the magnetic and magnetocaloric properties as well as the universal behaviour of magnetocaloric effect (MCE) for polycrystalline (Nd 0.5 Sm 0.5) 0.5 Sr 0.5 MnO 3 compound. The universal behaviour of magnetic entropy change is proposed here for conventional magnetocaloric effect (CMCE) materials with second order phase transition. Thus, the construction of a universal master curve for MCE is possible in our system by rescaling the temperature axis. For such CMCE compounds, ΔS follows the power law dependence of H: ΔS ∝ H n where 'n' is dependent on both H and T. In this paper, we have studied the universal behaviour of MCE at different conditions of initial and final field values. The result suggests that the universality behaviour of MCE is satisfied if and only if the initial base field remains zero or at a constant value. • The universality behaviour of MCE is satisfied if and only if the initial base field remains zero or at a constant value. • In the present system, predominant second order phase transition exists along with weak first order transition • Large value of relative cooling power (RCP) is observed for the studied ( Nd 0.5 Sm 0.5 ) 0.5 Sr 0.5 MnO 3 compound. [ABSTRACT FROM AUTHOR]