Ordering of localized electronic states in multiferroic TbMnO 3 : a soft x-ray resonant scattering study
Ordering of localized electronic states in multiferroic TbMnO 3 : a soft x-ray resonant scattering study
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多铁性 TbMnO 3 中局域电子态的排序：软 X 射线共振散射研究
DOI：
10.1088/0953-8984/20/42/422205
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发表时间：
2008
期刊：
影响因子：
1.7
通讯作者：
Forrest T
中科院分区：
文献类型：
--
作者：
Forrest T
软X射线共振散射（XRS）已被用来直接观察，第一次，在多铁性TbMnO 3的Mn和Tb网站上的本地化电子态的顺序。当入射光子能量被调谐到Mn L或Tb M边缘时，观察到X射线散射截面的大的共振增强，这分别提供关于Mn 3d和Tb 4f电子状态的信息。XRS信号的温度依赖性以一种与模型无关的方式确立了在高温相（28 K≤ T≤ 42 K）中Mn 3d亚晶格显示出长程有序。Tb 4f亚晶格只有在28K以下进入铁磁复合态时才有序。我们的研究结果进行了讨论，最近的硬XRS实验（敏感的空间扩展轨道）和中子散射。
Soft x-ray resonant scattering (XRS) has been used to observe directly, for the first time, the ordering of localized electronic states on both the Mn and the Tb sites in multiferroic TbMnO 3. Large resonant enhancements of the x-ray scattering cross-section were observed when the incident photon energy was tuned to either the Mn L or Tb M edges which provide information on the Mn 3d and Tb 4f electronic states, respectively. The temperature dependence of the XRS signal establishes, in a model independent way, that in the high-temperature phase (28 K≤ T≤ 42 K) the Mn 3d sublattice displays long-range order. The Tb 4f sublattices are found to order only on entering the combined ferroelectric/magnetic state below 28 K. Our results are discussed with respect to recent hard XRS experiments (sensitive to spatially extended orbitals) and neutron scattering.