Element-selective local structural analysis around B-site cations in multiferroic Pb(Fe1/2Nb1/2 )O3 using x-ray fluorescence holography
Element-selective local structural analysis around B-site cations in multiferroic Pb(Fe1/2Nb1/2 )O3 using x-ray fluorescence holography
复制标题
使用 X 射线荧光全息术对多铁性 Pb(Fe1/2Nb1/2 )O3 中 B 位阳离子周围的元素选择性局部结构进行分析
DOI：
10.1103/physrevb.104.144101
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发表时间：
2021
影响因子：
3.7
通讯作者：
Hayashi K.
中科院分区：
文献类型：
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作者：
Kimura K.;Urushihara D.;Kondo R.;Yamamoto Y.;Ang A. K. R.;Asaka T.;Happo N.;Hagihara T.;Matsushita T.;Tajiri H.;Miyazaki H.;Ohara K.;Iwata M.;Hayashi K.
利用X射线荧光全息（XFH）技术，结合单晶X射线衍射（XRD）实验，研究了多铁性（PFN）单晶中Nb离子周围局域结构随温度（300 ~ 100 K）的变化.我们发现，Nb-Pb相关性更显着地改变了冷却比平均结构来自单晶XRD实验，表明移动的功能的Nb离子。此外，我们详细分析了以前获得的XFH结果周围的Fe离子与周围的Nb离子进行比较。与Nb离子的情况相反，从300 K到大约150 K的Néel温度的平均结构很好地解释了Fe-Pb相关性随温度降低的变化。另一方面，在100 K时观察到Fe和Pb离子之间的显著位置波动，其被评估为比Nb和Pb离子之间的位置波动大90%。这一观察结果强烈表明PFN中存在自旋-晶格耦合。本研究清楚地阐明了Nb离子周围的局部环境的差异，周围的Fe离子位于同一地点。
X-ray fluorescence holography (XFH) measurements were carried out for multiferroic(PFN) single crystal to investigate variations in the local structures around Nb ions with decreasing temperature from 300 to 100 K, in combination with single-crystal x-ray diffraction (XRD) experiments. We find that the Nb–Pb correlation is more significantly changed by cooling than the average structure derived from the single-crystal XRD experiments, indicating a mobile feature of Nb ions. Also, we analyze previously obtained XFH results around Fe ions in detail for comparison with those around Nb ions. In contrast to the case of Nb ions, the variation in the Fe–Pb correlation with decreasing temperature is well explained by the average structure from 300 K down to the Néel temperature of about 150 K. On the other hand, a remarkable positional fluctuation between Fe and Pb ions is observed at 100 K, which is evaluated to be 90% larger than that between Nb and Pb ions. This observation strongly indicates the presence of spin-lattice coupling in PFN. The present study clearly elucidates the differences of local environment around the Nb ions from that around the Fe ions located at the same-site.