Magnetic properties and magnetic entropy change of perovskite manganites La0.9–xEuxSr0.1MnO3 (x=0.000, 0.075) by experimental method and numerical fitting

Abstract

Polycrystalline samples La0.9-xEuxSr0.1MnO3 (x = 0.000, 0.075) were prepared by the standard solid-state reaction method. The results show that the samples preform a characteristic of clusters spin-glass state at low temperature. The samples show a characteristic of ferromagnetism (FM) characteristic in the temperature range of 15–125 K and 15–150 K respectively; the samples show preformed clusters in the temperature range of 125–343 K and 150–325 K, respectively, the samples show paramagnetism (PM) characteristic above 343 and 325 K, respectively. The second-order transitions are found at 118 and 135 K for undoped and doped sample, respectively. When the applied magnetic field is 7 T, the maximum magnetic entropy change |ΔSM| value of the samples is near the Curie temperature (TC), and the value of |ΔSM| reaches 2.76 and 3.03 J/(K·kg), respectively. In addition, the relative cooling power (RCP) is found to be 425.28 and 443.53 J/kg. The numerical fitting data fit well with experimental data. These results indicate that both the samples have the potential to realize magnetic refrigeration in the high temperature region (T > 77 K).