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We have investigated the magnetic and magnetocaloric properties ofEuHo$_2$O$_4$ and EuDy$_2$O$_4$ by magnetization and heat capacity measurementsdown to 2 K. These compounds undergo a field-induced antiferromagnetic toferromagnetic transition and exhibit a huge entropy change. For a field changeof 0-8 T, the maximum magnetic entropy and adiabatic temperature changes are 30(25) J kg$^{-1}$ K$^{-1}$ and 12.7 (16) K, respectively and the correspondingvalue of refrigerant capacity is 540 (415) J kg$^{-1}$ for EuHo$_2$O$_4$(EuDy$_2$O$_4$). These magnetocaloric parameters also remain large down tolowest temperature measured and are even larger than that for some of thepotential magnetic refrigerants reported in the same temperature range for amoderate field change. Moreover, these materials are highly insulating andexhibit no thermal and field hysteresis, fulfilling the necessary conditionsfor a good magnetic refrigerant in the low-temperature region.

Giant magnetocaloric effect in magnetically frustrated EuHo$_2$O$_4$ and EuDy$_2$O$_4$ compounds