Band Dependent Interlayer f-Electron Hybridization in CeRhIn5
Band Dependent Interlayer f-Electron Hybridization in CeRhIn5
复制标题
CeRhIn5 中能带相关的层间 f 电子杂化
DOI：
10.1103/physrevlett.120.066403
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发表时间：
2018-02-09
影响因子：
8.6
通讯作者：
Feng, D. L.
中科院分区：
文献类型：
--
作者：
Chen, Q. Y.;Xu, D. F.;Feng, D. L.
重费米子研究的一个关键问题是，4f （5f）和传导电子之间杂化的细微变化如何导致基态的根本不同。CeRhIn 5是一个特别值得注意的例子：当用Co或Ir取代Rh时，反铁磁性会让位于超导性。在CeRhIn5的光发射研究中，我们证明了使用偏振光的共振角分辨光发射光谱可以提取4f晶体场态的详细信息，以及4f和传导电子杂化的详细信息，它们共同决定了基态。我们直接观察到f电子的弱色散Kondo共振，并识别出三个Ce 4f(5/2)(1)晶体电场能级中的两个和带依赖杂化，这表明杂化主要发生在CeIn3层中的Ce 4f态和RhIn2层中由Rh 4d和in 5p轨道组成的两个三维带之间。我们的结果使我们能够将在高温下观察到的性质与这种神秘的重费米子化合物的不寻常的低温性质联系起来。
A key issue in heavy fermion research is how subtle changes in the hybridization between the 4f (5f) and conduction electrons can result in fundamentally different ground states. CeRhIn 5 stands out as a particularly notable example: when replacing Rh with either Co or Ir, antiferromagnetism gives way to superconductivity. In this photoemission study of CeRhIn5, we demonstrate that the use of resonant angle-resolved photoemission spectroscopy with polarized light allows us to extract detailed information on the 4f crystal field states and details on the 4f and conduction electron hybridization, which together determine the ground state. We directly observe weakly dispersive Kondo resonances of f electrons and identify two of the three Ce 4f(5/2)(1) crystal-electric-field levels and band-dependent hybridization, which signals that the hybridization occurs primarily between the Ce 4f states in the CeIn3 layer and two more three-dimensional bands composed of the Rh 4d and In 5p orbitals in the RhIn2 layer. Our results allow us to connect the properties observed at elevated temperatures with the unusual low-temperature properties of this enigmatic heavy fermion compound.