Abstract
In this work, we present a detailed study on the magnetic and the magnetocaloric properties of Sm0.5+x Sr0.5−x MnO3 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 (T C ). We point out that all the samples undergo a first-order phase transition and exhibit a giant magnetocaloric effect. The magnetic entropy change (ΔS m ) of samples was calculated based on isothermal M(H, T) data. The maximum value of ΔS m (denoted as |ΔS max|) at around T C is found to be 2.6 − 8.9 J·kg −1·K −1 for ΔH = 30 kOe and depends on the value of x. We have also used the universal master curve method for the temperature dependences of ΔS m curves measured at different ΔH values, ΔS m (T,ΔH), to distinguish the magnetic order in the samples. Interestingly, none of the ΔS m (T,ΔH) curves for the samples follow the universal master curve, ΔS m (T,ΔH)/ΔS max versus θ = (T −T C )/(T r −T C ). As a consequence, a breakdown in the universal behavior of ΔS m (T,ΔH)/ΔS max versus θ curve is another feature confirming a first-order phase-transition nature.
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Thanh, T.D., Linh, D.C., Manh, T.V. et al. Magnetic and magnetocaloric properties of the first-order phase transition in Sm0.5+x Sr0.5−x MnO3 compounds. Journal of the Korean Physical Society 69, 316–322 (2016). https://doi.org/10.3938/jkps.69.316
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DOI: https://doi.org/10.3938/jkps.69.316