Room-temperature magnetocaloric properties and universal curve of MnCo1 − xSnxGe

Abstract

Here we study the critical behavior, magnetocaloric properties, and universal curve of the MnCo1−xSnxGe system with x=0.02,0.04,0.06and0.08. To model the magnetic transition and magnetocaloric effect, Kouvel–Fisher (KF) method, Landau theory, and phenomenological universal curve are performed. By using the KF method, the critical exponents β, γ and δ are close to the theoretical prediction from the mean-field model, consistent with the long-range ferromagnetic interactions in this series. Based on the Landau theory and Maxwell relation, we find an excellent agreement between theoretical and experimental magnetic entropy changes in this system. Moreover, a corresponding monotonous decrease between the maximum magnetic entropy change and magnetic moment is presented, and a recently proposed master curve behavior has been confirmed.