Large magnetic entropy change in La0.75Ca0.25MnO3

Magnetic entropy change of ${\mathrm{La}}_{\text{0.75}}{\mathrm{Ca}}_{\text{0.25}}{\mathrm{MnO}}_3$ with different particle size has been investigated. Magnetic entropy change $\text{∼4.7\hspace{0.5em}}\mathrm{J/kg\hspace{0.17em}K}$ larger than that of $\mathrm{Gd}$ has been observed at $\text{224\hspace{0.5em}}\mathrm{K}$ under a magnetic field of $\text{1.5\hspace{0.5em}}\mathrm{T}$ in comparatively big particles. This phenomenon of large magnetic entropy change indicates that the perovskite-type manganese oxides have potential applications for magnetic refrigerants in high temperature.