The magnetic structure of Co(NCNH)2 as determined by (spin-polarized) neutron diffraction

The magnetic structure of Co(NCNH)2 as determined by (spin-polarized) neutron diffraction
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通过(自旋极化)中子衍射测定的 Co(NCNH)2 磁性结构

DOI:
10.1016/j.jssc.2013.03.039
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发表时间:
2013
影响因子:
3.3
通讯作者:
R. Dronskowski
R. Dronskowski
中科院分区:
化学3区
文献类型:
--
作者:
P. Jacobs;A. Houben;A. Senyshyn;P. Müller;R. Dronskowski

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利用慕尼黑FRM II的SPODI和DNS仪器对Co(NCNH)2在10K以下的中子衍射数据进行了研究。(110)和(020)反射在4K附近有一个强度变化,归因于Co2+自旋的磁性排序的开始。在Rietveld细化的基础上评估了四种不同的自旋取向,包括沿所有三个晶体轴的反铁磁和铁磁有序。残差值和补充磁化率测量结果均表明,Co(NCNH)2的低温磁基态只有一个所有Co2+自旋平行于c轴的铁磁序才适合描述。由里特费尔德精化得到的磁矩与期望值的偏差可以解释为在略低于居里温度的温度下磁矩的不完全饱和或小的扬-泰勒畸变。
The magnetic structure of Co(NCNH)2has been studied by neutron diffraction data below 10K using the SPODI and DNS instruments at FRM II, Munich. There is an intensity change in the (110) and (020) reflections around 4K, to be attributed to the onset of a magnetic ordering of the Co2+spins. Four different spin orientations have been evaluated on the basis of Rietveld refinements, comprising antiferromagnetic as well as ferromagnetic ordering along all three crystallographic axes. Both residual values and supplementary susceptibility measurements evidence that only a ferromagnetic ordering with all Co2+spins parallel to the c axis is a suitable description of the low-temperature magnetic ground state of Co(NCNH)2. The deviation of the magnetic moment derived by the Rietveld refinement from the expectancy value may be explained either by an incomplete saturation of the moment at temperatures slightly below the Curie temperature or by a small Jahn–Teller distortion.
基于组合中子和 X 射线衍射数据的 M(NCNH)2 (M = Fe, Co) 晶体结构细化†
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发表时间: 2011
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