Observation of giant magnetocaloric effect in EuTi_1-xCr_xO₃

The magnetic properties and magnetocaloric effect in EuTi_1-xCr_xO₃ (x = 0, 0.02, 0.04, 0.1) compounds are investigated. The magnetic ground state (AFM) of pure EuTiO₃ can be significantly changed to be FM with slight Cr-doping. A giant reversible MCE and large RC in EuTi_1-xCr_xO₃ compounds were observed. The value of -Δ^SMmax reaches to 40.3 J/kg K for EuTiO₃ under the magnetic field change of 5 T. Especially, under the magnetic field changes of 1 and 2 T, the values of -Δ^SMmax are evaluated to be 12.5 and 22.5 J/Kg K and the maximum values of RC are 64 and 127 J/kg, without magnetic and thermal hysteresis for EuTi_1-xCr_xO₃ system. Therefore, the giant reversible MCE and large RC make the EuTi_1-xCr_xO₃ compounds could be considered as a good candidate material for low-temperature and low-field magnetic refrigerant.