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Tran Dang Thanh,Dinh Chi Linh,Tien Van Manh,Wen-Zhe Nan,Seong-Cho Yu,Hong-Guang Piao,Liqing Pan 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.3
In this work, we present a detailed study on the magnetic and the magnetocaloric properties of Sm0.5+xSr0.5−xMnO3 compounds with x = 0 − 0.1, which were prepared by using a solid-state reaction method. The x-dependent magnetic, as well as magnetocaloric, properties, including the magnetic phase transition, have been studied. The increase in Sm/Sr ratio plays an important role in controlling the Curie temperature (TC). We point out that all the samples undergo a first-order phase transition and exhibit a giant magnetocaloric effect. The magnetic entropy change (Sm) of samples was calculated based on isothermal M(H, T) data. The maximum value of Sm (denoted as |Smax|) at around TC is found to be 2.6 − 8.9 J·kg−1·K−1 for H = 30 kOe and depends on the value of x. We have also used the universal master curve method for the temperature dependences of Sm curves measured at different H values, Sm(T,H), to distinguish the magnetic order in the samples. Interestingly, none of the Sm(T,H) curves for the samples follow the universal master curve, Sm(T,H)/Smax versus = (T −TC)/(Tr−TC). As a consequence, a breakdown in the universal behavior of Sm(T,H)/Smax versus curve is another feature confirming a first-order phase-transition nature.