Abstract The perovskite Pr2FeMnO6 has been synthesized by citrate-gel combustion method. The material has an orthorhombic crystal structure with Pbnm space group. The presence of Fe3+ and Mn3+ cations in the material are confirmed by XPS analysis. A magnetization sign reversal is observed for the material at low-temperatures in low applied magnetic fields. When the applied field or temperature is increased, the negative magnetization got diminished. Such a sign reversal of magnetization is observed for the material as a result of the interaction between components of paramagnetic Pr3+ and Mn3+ moments opposite to the component of the ferromagnetic Fe3+ moment or the anti-aligned Fe-rich regions to that of Mn-rich regions containing with Pr3+. Negative exchange bias is also exhibited by Pr2FeMnO6 below 200 K which can be ascribed to the Dzyaloshinskii-Moriya interaction and magnetic exchange anisotropy. A high-temperature magnetic transition at TC = 576 K is identified for the material from the thermomagnetic data. From the detailed analysis of the thermomagnetic data, the presence of ferromagnetic short-range correlations is observed far above the TC, which suggests a Griffiths-like phase with Griffiths temperature at TG = 681 K.

中文翻译：

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正交钙钛矿Pr2FeMnO6中的磁化符号反转、交换偏置和类格里菲斯相

摘要 采用柠檬酸-凝胶燃烧法合成了钙钛矿Pr2FeMnO6。该材料具有Pbnm空间群的正交晶体结构。通过 XPS 分析证实材料中存在 Fe3+ 和 Mn3+ 阳离子。在低外加磁场的低温下观察到材料的磁化符号反转。当外加磁场或温度增加时，负磁化强度减弱。由于顺磁性 Pr3+ 和 Mn3+ 矩的成分与铁磁 Fe3+ 矩的成分相反或反排列的富铁区域与富锰区域的成分之间的相互作用，在材料中观察到这种磁化的符号反转含有 Pr3+。低于 200 K 的 Pr2FeMnO6 也表现出负交换偏差，这可以归因于 Dzyaloshinskii-Moriya 相互作用和磁交换各向异性。根据热磁数据确定了材料在 TC = 576 K 处的高温磁转变。通过对热磁数据的详细分析，在远高于 TC 的地方观察到铁磁短程相关性的存在，这表明存在格里菲斯温度在 TG = 681 K 的类似格里菲斯相。