Comparative study of adsorptions, reactions and electronic properties of U atoms on Cu(111), Ag(111), Au(111) and Ru(0001) surfaces

Comparative study of adsorptions, reactions and electronic properties of U atoms on Cu(111), Ag(111), Au(111) and Ru(0001) surfaces
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U原子在Cu(111)、Ag(111)、Au(111)和Ru(0001)表面吸附、反应和电子性质的比较研究

DOI:
10.1088/1361-6528/ac13e9
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发表时间:
2021-07
期刊:
影响因子:
3.5
通讯作者:
Qin Liu
Qin Liu
中科院分区:
材料科学3区
文献类型:
--
作者:
Wei Feng;Qunqing Hao;Qiuyun Chen;Rui-Zhi Qiu;Xinchun Lai;Jinfan Chen;Qin Liu

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过渡金属表面单个铀原子的神秘性质在补充我们对铀-过渡金属体系的理解方面起着不可或缺的作用,这是核能应用和基础科学研究的重要课题。利用扫描隧道显微镜和密度泛函理论计算,首次比较研究了单个U原子在Cu(111)、Ag(111)、Au(111)和Ru(0001)表面的吸附、反应和电子性质。当少量U在8 K下沉积到Cu(111)或Ag(111)上时,单个U原子显示出相对高的活性,并且可以吸附在完整的衬底表面上或诱导由衬底原子簇包围的各种表面空位。相比之下,大多数U原子倾向于分散地吸附在Au(111)和Ru(0001)的完整表面上,而不是在相同温度下产生表面空位。在所有情况下,近藤共振表现为费米能附近的非对称下降特征,仅在Ag(111)上单个U原子的微分隧穿电导谱中观察到。
The mysterious properties of individual U atoms on transition metal surfaces play indispensable parts in supplementing our understanding of uranium-transition metal systems, which are important subjects for both nuclear energy applications and fundamental scientific studies. By using scanning tunneling microscopy and density functional theory calculations, the adsorptions, reactions and electronic properties of individual U atoms on Cu(111), Ag(111), Au(111) and Ru(0001) surfaces were comparatively studied for the first time in this work. Upon the deposition of a small amount of U onto Cu(111) or Ag(111) at 8 K, individual U atoms show relatively high activity and can either be adsorbed on intact substrate surfaces or induce various surface vacancies surrounded by clusters of substrate atoms. By contrast, the majority of U atoms tend to dispersedly adsorb on intact surfaces of Au(111) and Ru(0001) rather than producing surface vacancies at the same temperature. In all cases, Kondo resonance manifested as asymmetric dip feature around Fermi energy is only observed in the differential tunneling conductance spectra of single U adatoms on Ag(111).
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