The effect of Al doping on the structure and magnetism in cobaltite CaBaCo4O7
The effect of Al doping on the structure and magnetism in cobaltite CaBaCo4O7
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DOI：
10.1016/j.jallcom.2013.04.017
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发表时间：
2013-04
影响因子：
6.2
通讯作者：
Y. Zou;Z. Qu;Lei Zhang;W. Ning;L. Ling;L. Pi;Yuheng Zhang
中科院分区：
文献类型：
--
作者：
Y. Zou;Z. Qu;Lei Zhang;W. Ning;L. Ling;L. Pi;Yuheng Zhang
我们报道了Al掺杂对CaBa（Co 1 −xAlx）4 O 7（0 <$x <$0.25）结构和磁性的影响。当Al含量x = 0.1时，该体系的结构由正交对称转变为六方对称.居里温度和磁化强度随Al掺杂量的增加而降低，表明亚铁磁基态逐渐被抑制。当x> 0.1时，基态最终转变为自旋玻璃态。此外，短程磁关联，这发生在高温下的CaBaCo 4 O 7，被发现逐渐抑制与Al含量的增加，并最终消失forx= 0.25。通过比较我们的结果与其他Co位掺杂的情况下，我们建议，晶格和自旋自由度是相对去耦CaBaCo 4 O 7。
We report the effects of Al-doping on the structure and magnetic properties in CaBa (Co1−xAlx)4O7(0 ⩽x⩽ 0.25). The system exhibits a structural transition from an orthorhombic symmetry to a hexagonal symmetry when the Al content exceedsx= 0.1. The Curie temperature and the value of the magnetization decrease with increasing Al doping level, indicating that the ferrimagnetic ground state is gradually suppressed. The ground state eventually transits into a spin-glass state forx> 0.1. Moreover, the short-range magnetic correlations, which occur at high temperatures in CaBaCo4O7, are found to be gradually suppressed with increasing Al content and eventually disappear forx= 0.25. By comparing our results with other Co-site doping cases, we suggest that the lattice and the spin degrees of freedom are relatively decoupled in CaBaCo4O7.