Local valence and magnetic characteristics of La2NiMnO6

被引：78
作者：
Guo, Haizhong [3 ]
Gupta, Arunava [1 ,4 ]
Varela, Maria [2 ]
Pennycook, Stephen [2 ]
Zhang, Jiandi [3 ]
机构：
[1] Univ Alabama, Dept Chem, Tuscaloosa, AL 35487 USA
[2] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA
[3] Florida Int Univ, Dept Phys, Miami, FL 33199 USA
[4] Univ Alabama, Ctr Mat Informat Technol, Tuscaloosa, AL 35487 USA
来源：
PHYSICAL REVIEW B | 2009年 / 79卷 / 17期
基金：
美国国家科学基金会;
关键词：
Curie temperature; electron energy loss spectra; ferromagnetism; lanthanum compounds; magnetic circular dichroism; magnetic epitaxial layers; scanning-transmission electron microscopy; superexchange interactions; X-ray absorption spectra; RAY CIRCULAR-DICHROISM; PEROVSKITES;
D O I：
10.1103/PhysRevB.79.172402
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Epitaxial thin films of ordered double perovskite La2NiMnO6 have been studied by a combination of high-resolution scanning transmission electron microscopy, quantitative electron energy loss spectroscopy, x-ray absorption spectroscopy, and x-ray magnetic circular dichroism (XMCD) spectroscopy. Our results show the nominal oxidation states of Ni and Mn ions to be Ni2+ and Mn4+ thus the ferromagnetism in ground state is mainly due to Ni2+-O-Mn4+ superexchange interactions. In addition, short-range ferromagnetic correlations are observed above the Curie temperature (T-C similar to 280 K) from XMCD measurement, which are likely induced by antisite defects against long-range ordering of the Ni/Mn sublattice. The XMCD results also demonstrate that the Ni2+ and Mn4+ ions are ferromagnetically aligned but exhibit large differences in the spin and orbital contributions to their effective magnetic moments.
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