Y. Regaieg, W. Cheikhrouhou-Koubaa, L. Sicard, E. K. Hlil
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Abstract
The rhombohedral La0.8K0.175Li0.025MnO3 sample was elaborated using the sol–gel method at low temperature of 900 °C. The prepared sample exhibits a second-order paramagnetic-ferromagnetic transition with decreasing temperature. Based on the data of the magnetic measurements, the critical behavior analysis is investigated through various techniques such as modified Arrott plot, Kouvel–Fisher method and critical isotherm analysis. The critical exponents determined using the Kouvel-Fisher method are found to be \(\beta \) = 0.533 and \(\gamma \) = 1.114 at \({T}_{C}\) ~ 270 K. The critical exponent values obtained are in agreement with the values predicted by the mean field model, indicating the existence of long-range magnetic interaction in our synthesized sample. The maximum of the magnetic entropy change is about 3.51 J kg−1 K−1 under a magnetic applied field change of 5 T. The relative cooling power is found to be 320.5 J kg−1 at 5 T. This value represents about 78% of that of standard gadolinium.
采用溶胶-凝胶法制备了La0.8K0.175Li0.025MnO3菱面体样品，样品温度为900℃。随着温度的降低，制备的样品呈现出二级顺磁-铁磁转变。根据磁测数据，采用修正Arrott图、Kouvel-Fisher法和临界等温线分析等方法对其临界行为进行了分析。在\({T}_{C}\) 270 K时，使用Kouvel-Fisher方法确定的临界指数为\(\beta \) = 0.533和\(\gamma \) = 1.114。得到的临界指数值与平均场模型预测的值一致，表明我们合成的样品中存在远程磁相互作用。在5t的磁场变化下，磁熵变化的最大值约为3.51 J kg−1 K−1，在5t时的相对冷却功率为320.5 J kg−1，该值约为78% of that of standard gadolinium.Graphical Abstract
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