低铜掺杂多铁性CaMn7O12的螺旋螺旋型磁性结构。

IF 1.9 3区 化学 Acta Crystallographica Section B-structural Science Pub Date : 2012-06-01 Epub Date: 2012-05-04 DOI:10.1107/S0108768112008038
W Sławiński, R Przeniosło, I Sosnowska, V Petříček
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引用次数: 19

摘要

利用基于磁超空间群R31′(00γ)ts的模型,分析了多铁性CaCu(x)Mn(7-x)O(12)的中子和同步辐射(SR)粉末衍射数据,研究了CaCu(x)Mn(7-x)O(12)的调制晶体结构和调制磁有序。原子位置调制和磁调制都用调制向量(0,0,q)来描述。磁排序是螺旋型圆螺旋,其中磁矩垂直于c方向。Mn(3+)和Mn(4+)离子的调制矢量长度和有序磁矩与温度的关系在T = 50 K和n温度T(N)近似等于90 K之间。原子位置调制长度L(p)和磁调制长度L(m)在50 K和T(N)之间的所有温度下都满足L(m) = 2L(p)的关系。
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Helical screw type magnetic structure of the multiferroic CaMn7O12 with low Cu-doping.

The modulated crystal structure and modulated magnetic ordering of the multiferroic CaCu(x)Mn(7-x)O(12) is studied by analysing neutron and synchrotron-radiation (SR) powder diffraction data with a model based on the magnetic superspace group R31'(00γ)ts. Both atomic position modulations and magnetic modulations are described with the modulation vector (0, 0, q). The magnetic ordering is a screw-type circular helix where the magnetic moments are perpendicular to the c direction. The temperature dependence of the modulation vector length and the ordered magnetic moments of Mn(3+) and Mn(4+) ions is given between T = 50 K and the Néel temperature T(N) is approximately equal to 90 K. The atomic position modulation length L(p) and the magnetic modulation length L(m) fulfil the relation L(m) = 2L(p) at all temperatures between 50 K and T(N).

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来源期刊
自引率
5.30%
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审稿时长
6-12 weeks
期刊介绍: Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials publishes scientific articles related to the structural science of compounds and materials in the widest sense. Knowledge of the arrangements of atoms, including their temporal variations and dependencies on temperature and pressure, is often the key to understanding physical and chemical phenomena and is crucial for the design of new materials and supramolecular devices. Acta Crystallographica B is the forum for the publication of such contributions. Scientific developments based on experimental studies as well as those based on theoretical approaches, including crystal-structure prediction, structure-property relations and the use of databases of crystal structures, are published.
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