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首页> 外文期刊>Chemistry: A European journal >Competing magnetic interactions in Na10Co4O10, studied by neutron diffraction
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Competing magnetic interactions in Na10Co4O10, studied by neutron diffraction

机译：通过中子衍射研究Na10Co4O10中竞争的磁性相互作用

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摘要

Na(10)Co(4)o(10) was investigated by neutron powder diffraction at 230, 70, and 4K. The crystal structure, determined previously by X-ray diffraction on single crystals, was confirmed. Na10Co4O10 orders magnetically below 37 K. All observed magnetic reflections could be indexed by integers (hkl) with respect to the chemical unit cell and the magnetic propagation vector q=0. The refinement was performed in the Shubnikov space group C2/c and indicated a collinear antiferromagnetic spin structure. The determined spin arrangement is consistent with the magnetic intratetramer interactions suggested previously from the analysis of magnetic susceptibility data: the magnetic moments of the central Co-III ions of the Co4O10 tetramer lie parallel to each other and couple in an antiparallel fashion to the terminal Co-II moments. The Rietveld analysis shows that the net moments of 0.64 mu(B) per tetramer form ferromagnetic layers parallel to the ab plane. Adjacent layers are coupled antiferromagnetically along c.The spins are aligned in the ac plane along the line connecting adjacent Co-II and Co-III ions of the tetramer. We have determined unusually low values for the ordered magnetic moments of 2.43(5) mu(B) and 2.11(6) mu(B) for Co-III and Co-II respectively. The occurrence of spontaneous magnetization below 37 K indicates a slight canting of 2.2 degrees of the antiferromagnetic structure. A representation analysis shows that a weak ferromagnetic component along b is compatible with the determined antiferromagnetic structure.
机译：Na（10）Co（4）o（10）通过在230、70和4K下的中子粉末衍射研究。证实了晶体结构，该晶体结构先前通过X射线衍射在单晶上确定。 Na10Co4O10的磁性在37 K以下有序。相对于化学晶胞和磁传播矢量q = 0，所有观察到的磁反射都可以用整数（hkl）索引。细化是在Shubnikov空间群C2 / c中进行的，表明共线反铁磁自旋结构。确定的自旋排列与先前从磁化率数据分析中得出的磁性四聚体相互作用一致：Co4O10四聚体的中心Co-III离子的磁矩彼此平行，并以反平行方式耦合至末端Co -II时刻。 Rietveld分析表明，每个四聚体的0.64 mu（B）的净矩形成了平行于ab平面的铁磁层。相邻层沿c反铁磁耦合。自旋沿着连接四聚体的相邻Co-II和Co-III离子的线在ac平面中对齐。我们确定了Co-III和Co-II的有序磁矩分别为2.43（5）mu（B）和2.11（6）mu（B）的异常低的值。低于37 K的自发磁化现象表明反铁磁结构略微倾斜了2.2度。表示分析表明，沿b的弱铁磁分量与确定的反铁磁结构兼容。

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