Critical behavior and magnetocaloric effect in Mn${}_3$Si${}_2$Te${}_6$

Abstract

The critical properties and magnetocaloric effect of semiconducting ferrimagnet Mn${}_3$Si${}_2$Te${}_6$ single crystals have been investigated by bulk magnetization and heat capacity around $T_c$. Critical exponents $\beta =0.41\pm 0.01$ with a critical temperature $T_c=74.18\pm 0.08$ K and $\gamma =1.21\pm 0.02$ with $T_c=74.35\pm 0.05$ K are deduced by the Kouvel-Fisher plot, whereas $\delta =4.29\pm 0.05(3.40\pm 0.02)$ is obtained by a critical isotherm analysis at $T=74(75)$ K. The magnetic exchange distance is found to decay as $J(r)\approx r^{-4.79}$, which lies between the mean-field and 3D Heisenberg models. Moreover, the magnetic entropy change $-\Delta S_M$ features a maximum at $T_c$, i.e., $-\Delta S_M^{max}\sim$ 2.53(1.67) J kg${}^{-1}$ K${}^{-1}$ with in-plane(out-of-plane) field change of 5 T, confirming large magnetic anisotropy. The heat capacity measurement further gives $-\Delta S_M^{max}$ $\sim$ 2.94 J kg${}^{-1}$ K${}^{-1}$ and the corresponding adiabatic temperature change $\Delta T_{ad}$ $\sim$ 1.14 K with out-of-plane field change of 9 T.

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