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In this paper, we report on the magnetic and magnetocaloric features ofDy-substituted YMn$_2$O$_5$ (Y$_{1-x}$Dy$_x$Mn$_2$O$_5$) with $x=$ 0.6, 0.8,and 1 series elaborated by sol-gel method. X-ray diffraction and Ramanmeasurements attest well the high quality of our polycrystalline samples thatcrystallize in an orthorhombic structure with the Pbam space group. The Ramanphonon frequencies were carried out and compared with the lattice dynamicscalculations to identify the vibrational properties of all detected modes atroom temperature. As expected, our magnetic study reveals that themagnetization was enhanced by the substitution of Y$^{3+}$ by Dy$^{3+}$. TheDy-substituted YMn$_2$O$_5$ sets the N\'eel transition [TN (Mn)] in thetemperature range going from 40 to 45 K favoring the emergence of a transitionat a very low temperature due to the long-range ordering of the Dy3+ magneticmoments below 13K [TN (Dy)]. Dual peaks in the magnetic entropy change curveare also observed being in good agreement with magnetization data, whichenlarges the range of application of these materials. On the other hand, alarge magnetocaloric effect is observed close to 13 K which is mainly due theordering of Dy$^{3+}$ magnetic moments. Also, the incommensurateantiferromagnetic transition of Mn magnetic moment taking place around 40 Kaffects slightly the entropy change. Our refrigerant capacity (RC) findings arehigher compared to the average of RC for a, b, c axis of single crystal samplesas HoMn$_2$O$_5$ and TbMn$_2$O$_5$, which confirms that our polycrystallinematerials stand for promising magnetic refrigerant candidates that can beinvested in space technology, hydrogen and helium liquefaction at cryogenictemperature.

A study of the magnetocaloric behavior of Dy-substituted YMn$_2$O$_5$ compounds