Large Low-Field Magnetic Refrigeration In Ferromagnetic Insulator Euti0.9v0.1o3

Magnetic properties and the magnetocaloric effect have been studied in a ferromagnetic compound EuTi0.9V0.1O3 by magnetization and heat capacity measurements. With the application of a magnetic field, the spin entropy is strongly suppressed and a large magnetic entropy change is observed near the Curie temperature T-C = 4.54 K. The values of entropy change Delta S-m, adiabatic temperature change, and magnetic cooling capacity are 41.4 J kg(-1) K-1, 17.4 K, and 577 J kg(-1), respectively, for a field change of 0-7 T. This compound also shows a large magnetocaloric effect at low magnetic fields. In particular, -Delta S-m reaches as high as 11 and 20 J kg(-1) K-1 for field changes of 0-1 and 0-2 T, respectively. These values of magnetocaloric parameters are significantly larger than that reported for several potential low-temperature magnetic refrigerants. The low-field large magnetocaloric effect, together with the absence of thermal and field hysteresis, makes the insulating EuTi0.9V0.1O3 compound a promising candidate for refrigeration below 30 K.