We present the large reversible magnetocaloric effect (MCE) of the ferromagnetic semiconductor EuS, which shows a maximum magnetic entropy change of -ΔSmmax~37 J kg-1 K-1, an adiabatic temperature change of ΔTad~10.4 K and a relative cooling power of RCP~782 J kg-1 at 18.5 K for a magnetic field change ΔH=5 T. Particularly, the large MCE is isotropic and without hysteresis loss, even for a magnetic field change of 2 T the values of -ΔSmmax, ΔTad and RCP reach as high as 22 J kg-1 K-1, 7.5 K and 284 J kg-1, respectively. These results indicate that EuS has excellent refrigeration performance at the temperatures near 20 K, and thus can be considered as the potential magnetic refrigerant material for liquefaction of hydrogen.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry