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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >PNAS Plus: Large-moment antiferromagnetic order in overdoped high-Tc superconductor 154SmFeAsO1−xDx
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PNAS Plus: Large-moment antiferromagnetic order in overdoped high-Tc superconductor 154SmFeAsO1−xDx

机译：PNAS Plus：超掺杂高Tc超导体154SmFeAsO1-xDx中的大矩反铁磁顺序

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摘要

In iron-based superconductors, high critical temperature (Tc) superconductivity over 50 K has only been accomplished in electron-doped hREFeAsO (hRE is heavy rare earth (RE) element). Although hREFeAsO has the highest bulk Tc (58 K), progress in understanding its physical properties has been relatively slow due to difficulties in achieving high-concentration electron doping and carrying out neutron experiments. Here, we present a systematic neutron powder diffraction study of 154SmFeAsO1−xDx, and the discovery of a long-range antiferromagnetic ordering with x ≥ 0.56 (AFM2) accompanying a structural transition from tetragonal to orthorhombic. Surprisingly, the Fe magnetic moment in AFM2 reaches a magnitude of 2.73 μB/Fe, which is the largest in all nondoped iron pnictides and chalcogenides. Theoretical calculations suggest that the AFM2 phase originates in kinetic frustration of the Fe-3dxy orbital, in which the nearest-neighbor hopping parameter becomes zero. The unique phase diagram, i.e., highest-Tc superconducting phase adjacent to the strongly correlated phase in electron-overdoped regime, yields important clues to the unconventional origins of superconductivity.
机译：在铁基超导体中，仅在掺杂电子的hREFeAsO（hRE是重稀土（RE）元素）中才能实现超过50 K的高临界温度（Tc）超导。尽管hREFeAsO具有最高的体相Tc（58 K），但由于难以实现高浓度电子掺杂和进行中子实验，因此对其物理性质的了解相对较慢。在这里，我们对 154 SmFeAsO1-xDx进行了系统的中子粉末衍射研究，并发现了x≥0.56（AFM2）伴随着从四方向正交的结构转变的远距离反铁磁有序。出乎意料的是，AFM2中的Fe磁矩达到2.73μB/ Fe，在所有未掺杂的铁离子和硫属元素化物中最大。理论计算表明，AFM2相起源于Fe-3dxy轨道的动力失灵，其中最近邻居跳跃参数变为零。独特的相图，即在电子过量掺杂体系中与强相关相相邻的最高Tc超导相，为超常规非常规起源提供了重要线索。

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