Magnetism and critical behavior of double perovskite RE2CoMnO6 (RE = La and Eu) compounds
Magnetism and critical behavior of double perovskite RE2CoMnO6 (RE = La and Eu) compounds
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双钙钛矿 RE2CoMnO6（RE = La 和 Eu）化合物的磁性和临界行为
DOI：
10.1016/j.jmmm.2019.03.009
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发表时间：
2019
影响因子：
2.7
通讯作者：
Li Lingwei
中科院分区：
文献类型：
--
作者：
Jia Youshun;Li Yong;Zhao Lizhong;Li Lingwei
利用修正的Arrott图（MAP）、Kouvel-Fisher图（K-F）和临界等温线分析（CI）系统研究了双钙钛矿RE_2CoMnO_6（RE= La和Eu）的磁性和居里温度TC附近的临界行为。由K-F曲线求得的临界参数β、δ和γ的可靠值分别为0.4704、0.9978和3.12（TC = 210.8 K）和0.6065、0.9237和2.52（TC = 130.3 K）。此外，通过Widom标度关系和磁性方程等方法，进一步验证了两种样品临界参数的可靠性。所得的临界参数值均接近平均场理论模型的值，表明RE 2CoMnO 6（RE= La和Eu）化合物存在长程FM有序。
The magnetic properties and critical behavior near the Curie temperatureTCin the double perovskiteRE2CoMnO6(RE= La and Eu) were systematically investigated via the modified Arrott plots (MAP), the Kouvel-Fisher plot (K-F), and the critical isotherm analysis (CI). The reliable value of critical parameters (β,δ, andγ) obtained from K-F plot are to be 0.4704, 0.9978, and 3.12 withTCof 210.8 K for La2CoMnO6, and to be 0.6065, 0.9237, and 2.52 withTCof 130.3 K for Eu2CoMnO6, respectively. Moreover, the reliability of critical parameters of two samples was further verified by different methods including the Widom scaling relation and the magnetic equation. The obtained values of critical parameters are all close to the value of the mean-field theoretical model which manifested the presence of the long-range FM order forRE2CoMnO6(RE= La and Eu) compounds.