Direct observation of the f–c hybridization in the ordered uranium films on W(110)  

作　　者：Qiuyun Chen Shiyong Tan Wei Feng Lizhu Luo Xiegang Zhu Xinchun Lai 陈秋云;谭世勇;冯卫;罗丽珠;朱燮刚;赖新春(Science and Technology on Surface Physics and Chemistry Laboratory)

机构地区：[1]Science and Technology on Surface Physics and Chemistry Laboratory

出　　处：《Chinese Physics B》2019年第7期444-448,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11874330);Science Challenge Project,China(Grant No.TZ2016004);the National Key Research and Development Program of China(Grant No.2017YFA0303104)

摘　　要：A key issue in metallic uranium and its related actinide compounds is the character of the f electrons, whether it is localized or itinerant.Here we grew well ordered uranium films on a W(110) substrate.The surface topography was investigated by scanning tunneling microscopy.The Fermi surface and band structure of the grown films were studied by angle-resolved photoemission spectroscopy.Large spectral weight can be observed around the Fermi level, which mainly comes from the f states.Additionally, we provided direct evidence that the f bands hybridize with the conduction bands in the uranium ordered films, which is different from previously reported mechanism of the direct f–f interaction.We propose that the above two mechanisms both exist in this system by manifesting themselves in different momentum spaces.Our results give a comprehensive study of the ordered uranium films and may throw new light on the study of the 5 f-electron character and physical properties of metallic uranium and other related actinide materials.A key issue in metallic uranium and its related actinide compounds is the character of the f electrons, whether it is localized or itinerant.Here we grew well ordered uranium films on a W(110) substrate.The surface topography was investigated by scanning tunneling microscopy.The Fermi surface and band structure of the grown films were studied by angle-resolved photoemission spectroscopy.Large spectral weight can be observed around the Fermi level, which mainly comes from the f states.Additionally, we provided direct evidence that the f bands hybridize with the conduction bands in the uranium ordered films, which is different from previously reported mechanism of the direct f–f interaction.We propose that the above two mechanisms both exist in this system by manifesting themselves in different momentum spaces.Our results give a comprehensive study of the ordered uranium films and may throw new light on the study of the 5 f-electron character and physical properties of metallic uranium and other related actinide materials.

关 键 词：URANIUM films 5f-electron character angle-resolved PHOTOEMISSION spectroscopy 

分 类 号：TB383.2[一般工业技术—材料科学与工程]