非均匀内磁场中自旋为3/2的交替键Ru链Tb3RuO7的磁结构：部分无序态的出现
Magnetic structure of Tb3RuO7 possessing alternating-bond spin-3/2 Ru chains in a nonuniform internal magnetic field: appearance of a partially disordered state
摘要：
本文报道了用粉末中子衍射实验测定的Tb_3RuO_7和Nd_3RuO_7的磁性结构。在Tb_3RuO_7中，形成了自旋为3/2Ru_1-Ru_2的交替键链。Ru 1和Ru 2磁矩在15 K以下分别为有序和无序（顺磁性）。这一结果表明，部分无序（PD）状态的外观，虽然两个Ru网站是非常相似的。在Nd_3RuO_7中，Ru_1和Ru_2离子形成独立的均匀链。Ru 1和Ru 2矩都在17.5K以下。Tb_3RuO_7的PD态的主要来源可能是交换作用中的磁阻挫。由Ru 1位的Tb有序矩产生的内部磁场与Ru 2位的不同。我们推测，不同的（不均匀的）内部磁场增强了Ru 1和Ru 2的时刻之间的属性的差异。
英文摘要：
We report on the magnetic structures of Tb3RuO7 and Nd3RuO7 determined from powder neutron-diffraction experiments. In Tb3RuO7, alternating-bond spin-3/2 Ru1-Ru2 chains are formed. The Ru1 and Ru2 moments are ordered and disordered (paramagnetic), respectively, below 15 K. This result indicates the appearance of a partially disordered (PD) state, although the two Ru sites are very similar to each other. In Nd3RuO7, the Ru1 and Ru2 ions form independent uniform chains. Both the Ru1 and Ru2 moments are ordered below 17.5 K. Probably, the main source of the PD state in Tb3RuO7 is the magnetic frustration in the exchange interactions. The internal magnetic field generated by the Tb ordered moments at the Ru1 sites is different from that at the Ru2 sites. We speculate that the different (nonuniform) internal magnetic field enhances the difference in the properties between the Ru1 and Ru2 moments.
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