Effects of Sr-doping on the giant magnetocaloric effect of EuTiO3

The magnetic properties and magnetocaloric effect of Eu1−xSrxTiO3 (x=0-0.1) compounds are investigated. With slight Sr-doping, the ferromagnetic (FM) coupling significantly increased and FM exchange is dominant in the delicate balance. A giant reversible magnetocaloric effect (MCE) and large refrigerant capacity (RC) for Eu1−xSrxTiO3 compounds were observed. The values of −ΔSMmax are evaluated to be around 10 J/kg K under a magnetic field change of 1 T and 21 J/kg K under a magnetic field change of 2 T, respectively. But, the values of RC are increased with the more Eu in EuTiO3 to be substituted by Sr. Therefore, the giant reversible MCE and large RC make the Eu1−xSrxTiO3 compound a good candidate for magnetic refrigerant working at low-temperature and low-field.