Magnetocaloric effect in the layered organic–inorganic hybrid(CH3NH3)2CuCl4

We present a study of magnetocaloric effect of the quasi-two-dimensional(2D) ferromagnet(CH3NH3)2CuCl4in ab plane(easy-plane). From the measurements of magnetic field dependence of magnetization at various temperatures,we have discovered a large magnetic entropy change associated with the ferromagnetic–paramagnetic transition. The heat capacity measurements reveal an abnormal adiabatic change below the Curie temperature Tc8.9 K, which is caused by the nature of quasi-2D layered crystal structure. These results suggest that perovskite organic–inorganic hybrids with a layered structure are suitable candidates as working substances in magnetic refrigeration technology.