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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Investigation on the Magnetic Anomaly and the Role of Orbital Moment on the Magnetic Properties of LaMn_(0.5)Co_(0.5)O3
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Investigation on the Magnetic Anomaly and the Role of Orbital Moment on the Magnetic Properties of LaMn_(0.5)Co_(0.5)O3

机译：LaMn_（0.5）Co_（0.5）O3的磁异常及其轨道矩对磁性能的影响

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摘要

Two distinct ferromagnetic phases are present in LaMn_(0.5). C0_(0.5)O3 for which the spin-only magnetic moment calculated from the high temperature dc susceptibility is found to be unusually high. Such a high moment can only be accounted for by assigning the valence state of the cations to Mn~(2+)- Co~(4+). This is unrealistic as the earlier report based on X-ray absorption spectroscopy (XAS) has suggested the valence state to be mainlyMn — Co~(2+) with traces of Co~(2+). Also from our studies using XAS, it is found that the valence state is mainly Mn~(4+)—Co~(2+). In addition, no notable difference is observed in the minor Co~(2+) present in both phases. Our results based on X-ray magnetic circular dichroism studies (XMCD) reveal the presence of "distinct" high orbital moment associated with Co~(2+) for both phases. Thus it is found that the distinctness of the orbital moment also plays a vital role in determining the magnetic moment and T_c of both phases of LaMn_(0.5)Co_(0.5)O3. By considering the orbital moment obtained from XMCD, the anomaly in the paramagnetic susceptibility is resolved and thus we are able to assign the valence state to Mn~(4+)—Co~(2+) configuration. The difference in the magnitude of orbital moment in both phases is believed to be due to the crystal field effects.
机译：LaMn_（0.5）中存在两个不同的铁磁相。根据高温dc磁化率计算出的仅自旋磁矩异常高的C0_（0.5）O3很高。只能通过将阳离子的价态分配给Mn〜（2 +）-Co〜（4+）来解决这么高的力矩。这是不现实的，因为较早的基于X射线吸收光谱（XAS）的报告表明，化合价态主要为Mn-Co〜（2+）和痕量的Co〜（2+）。另外，根据我们使用XAS的研究，发现价态主要是Mn〜（4 +）-Co〜（2+）。此外，在两个相中存在的次要Co〜（2+）均未观察到显着差异。我们基于X射线磁性圆二色性研究（XMCD）的结果表明，这两个阶段都存在与Co〜（2+）相关的​​“明显”高轨道矩。因此发现，轨道矩的不同在确定LaMn_（0.5）Co_（0.5）O3两相的磁矩和T_c方面也起着至关重要的作用。通过考虑从XMCD获得的轨道矩，顺磁磁化率的异常得以解决，因此我们能够将价态分配给Mn〜（4 +）-Co〜（2+）构型。据信这两个阶段的轨道矩的大小的差异是由于晶体场效应引起的。

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