Flat-band-induced itinerant ferromagnetism in RbCo2Se2
Flat-band-induced itinerant ferromagnetism in RbCo2Se2
复制标题
RbCo2Se2 中平带诱导的巡回铁磁性
DOI：
10.1103/physrevb.103.165105
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发表时间：
2021
影响因子：
3.7
通讯作者：
Birgeneau R. J.
中科院分区：
文献类型：
--
作者：
Huang Jianwei;Wang Zhicai;Pang Hongsheng;Wu Han;Cao Huibo;Mo Sung-Kwan;Rustagi Avinash;Kemper A. F.;Wang Meng;Yi Ming;Birgeneau R. J.
(=K、Rb、Cs) 是铁基超导体的同系物。通过对磁化强度、输运、中子衍射、角分辨光电子能谱测量和第一性原理计算的综合研究，我们确定了铁磁序以及电子色散的轨道相关自旋分裂。此外，我们确定有序矩由费米能级附近的平带主导，该平带在铁磁转变过程中表现出最大的自旋分裂，表明铁磁性的流动起源。在铁基超导体的更广泛背景下，我们发现这种平带是铁硫族化物和铁磷族化物能带结构的共同特征，可通过重电子掺杂获得。
(=K, Rb, Cs) is a homologue of the iron-based superconductor. From a comprehensive study ofvia measurements of magnetization, transport, neutron diffraction, angle-resolved photoemission spectroscopy, and first-principles calculations, we identify a ferromagnetic order accompanied by an orbital-dependent spin splitting of the electronic dispersions. Furthermore, we identify the ordered moment to be dominated by aflat band near the Fermi level, which exhibits the largest spin splitting across the ferromagnetic transition, suggesting an itinerant origin of the ferromagnetism. In the broader context of the iron-based superconductors, we find thisflat band to be a common feature in the band structures of both iron chalcogenides and iron pnictides, accessible via heavy electron doping.