Hard and soft x-ray photoemission spectroscopy study of the new Kondo system SmO thin film
Hard and soft x-ray photoemission spectroscopy study of the new Kondo system SmO thin film
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DOI：
10.1103/physrevmaterials.4.095001
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
S. Sakamoto;K. Kaminaga;D. Oka;R. Yukawa;M. Horio;Y. Yokoyama;Kohei Yamamoto;K. Takubo;Y. Nonaka-Y
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文献类型：
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作者：
S. Sakamoto;K. Kaminaga;D. Oka;R. Yukawa;M. Horio;Y. Yokoyama;Kohei Yamamoto;K. Takubo;Y. Nonaka-Y
SmO薄膜是一种新的近藤系统，在10 K附近电阻率出现了回升，理论上认为它具有拓扑非平凡的能带结构。我们已经进行了硬X射线和软X射线光电子能谱来阐明的电子结构的SmO。从Sm的3$d$芯能级谱，我们估计Sm的价为2.96，证明Sm具有混合价。的价带光电子能谱表现出清晰的费米边缘源于Sm 5$d$-衍生带。目前的发现是一致的理论，提出了一种可能的拓扑状态的SmO和稀土一氧化物或其异质结构可以是一个新的游乐场的相互作用的强电子相关性和自旋轨道耦合。
SmO thin film is a new Kondo system showing a resistivity upturn around 10 K and was theoretically proposed to have a topologically nontrivial band structure. We have performed hard x-ray and soft x-ray photoemission spectroscopy to elucidate the electronic structure of SmO. From the Sm 3$d$ core-level spectra, we have estimated the valence of Sm to be $\sim$2.96, proving that the Sm has a mixed valence. The valence-band photoemission spectra exhibit a clear Fermi edge originating from the Sm 5$d$-derived band. The present finding is consistent with the theory suggesting a possible topological state in SmO and show that rare-earth monoxides or their heterostructures can be a new playground for the interplay of strong electron correlation and spin-orbit coupling.