Temperature-Dependent Electronic Structure of EuNi2P2 Revealed by Angle-Resolved Photoemission Spectroscopy
Temperature-Dependent Electronic Structure of EuNi2P2 Revealed by Angle-Resolved Photoemission Spectroscopy
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角分辨光电发射光谱揭示了 EuNi2P2 的温度依赖性电子结构
DOI：
10.1088/1742-6596/807/1/012006
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
and K. Mimura
中科院分区：
文献类型：
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作者：
H. Anzai;K. Ichiki;E. K. Schwier;H. Iwasawa;K. Shimada;H. Namatame;M. Taniguchi;A. Mitsuda;H. Wada;and K. Mimura
我们使用角分辨光电子能谱研究了 EuNi 2 P 2 的电子结构，它表现出重费米子和混合价行为。在费米能附近观察到多个Ni 3d能带，其中一个在布里渊区X点周围形成孔状费米面。我们还发现，Ni 3d 态的光谱权重随着温度的降低而迅速增强，这与 Eu 离子平均价态的温度依赖性一致。因此，我们的结果证明了 EuNi 2 P 2 中 Ni 3d 和 Eu 4f 电子之间的杂化。
We studied the electronic structure of EuNi 2 P 2, which exhibits both heavy-fermion and mixed-valence behaviors, using angle-resolved photoemission spectroscopy. Multiple Ni 3d bands were observed near the Fermi energy, and one of them forms a hole-like Fermi surface around the X point of the Brillouin zone. We also found that the spectral weight of the Ni 3d states is rapidly enhanced with decreasing temperature, which is consistent with the temperature dependence of the mean valence of Eu ions. Our results thus demonstrate hybridization between the Ni 3d and Eu 4f electrons in EuNi 2 P 2.