In Situ Electronic Structure Study of Epitaxial Niobium Thin Films by Angle-Resolved Photoemission Spectroscopy

被引：5
|
作者：
Xiang, Pai [1 ]
Liu, Ji-Shan [1 ,2 ,3 ]
Li, Ming-Ying [1 ]
Yang, Hai-Feng [1 ]
Liu, Zheng-Tai [1 ]
Fan, Cong-Cong [1 ]
Shen, Da-Wei [1 ,2 ,3 ]
Wang, Zhen [1 ,2 ,3 ]
Liu, Zhi [1 ,2 ,3 ,4 ]
机构：
[1] Chinese Acad Sci, State Key Lab Funct Mat Informat, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China
[2] CAS Ctr Excellence Superconducting Elect, Shanghai 200050, Peoples R China
[3] CAS Shanghai Sci Res Ctr, Shanghai 201203, Peoples R China
[4] ShanghaiTech Univ, Sch Phys Sci & Technol, Div Photon Sci & Condensed Matter Phys, Shanghai 200031, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2017年 / 34卷 / 07期
基金：
中国国家自然科学基金; 上海市自然科学基金;
关键词：
SURFACE-STATE; NB FILMS; SUPERCONDUCTIVITY; SAPPHIRE; GROWTH;
D O I：
10.1088/0256-307X/34/7/077402
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
High-quality single crystalline niobium films are grown on a-plane sapphire in molecular beam epitaxy. The film is single crystalline with a (110) orientation, and both the rocking curve and the reflection high-energy electron diffraction pattern demonstrate its high-quality with an atomically smooth surface. By in situ study of its electronic structure, a rather weak electron-electron correlation effect is demonstrated experimentally in this 4d transition metal. Moreover, a kink structure is observed in the electronic structure, which may result from electron-phonon interaction and it might contribute to the superconductivity. Our results help to understand the properties of niobium deeply.
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页数：5
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