Electronic structure of YFe2Ge2 studied by angle-resolved photoemission spectroscopy

被引：16
|
作者：
Xu, D. F. [1 ,2 ,3 ]
Shen, D. W. [4 ,5 ]
Zhu, D. [6 ,7 ]
Jiang, J. [1 ,2 ,3 ]
Xie, B. P. [1 ,2 ,3 ]
Wang, Q. S. [1 ]
Pan, B. Y. [1 ]
Dudin, P. [8 ]
Kim, T. K. [8 ]
Hoesch, M. [8 ]
Zhao, J. [1 ,3 ]
Wan, X. G. [6 ,7 ]
Feng, D. L. [1 ,2 ,3 ]
机构：
[1] Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China
[2] Fudan Univ, Adv Mat Lab, Shanghai 200433, Peoples R China
[3] Fudan Univ, Collaborat Innovat Ctr Adv Microstruct, Shanghai 200433, Peoples R China
[4] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol SIMT, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China
[5] CAS Shanghai Sci Res Ctr, Shanghai 201203, Peoples R China
[6] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[7] Nanjing Univ, Coll Phys, Nanjing 210093, Jiangsu, Peoples R China
[8] Harwell Sci & Innovat Campus, Diamond Light Source, Didcot OX11 0DE, Oxon, England
来源：
PHYSICAL REVIEW B | 2016年 / 93卷 / 02期
基金：
美国国家科学基金会;
关键词：
SUPERCONDUCTIVITY;
D O I：
10.1103/PhysRevB.93.024506
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report an angle-resolved photoemission spectroscopy study of a ThCr2Si2-type superconductor YFe2Ge2 (T-c approximate to 1.8 K) in the normal state. The resolved low-energy band structure mainly consists of several flat Fe bands, while the renormalization factors of different bands range from 1.7 to 2.8. Around the Fermi level, these bands contribute to a high density of states, which may account for the unusually high Sommerfeld coefficient gamma. Besides, a 30 meV kink is observed, which is probably induced by electron-phonon interactions. Our results indicate that YFe2Ge2 is a moderately correlated compound, while electron-phonon coupling should be taken into account to better understand its properties.
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页数：5
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