Chin. Phys. Lett.  2016, Vol. 33 Issue (07): 077402    DOI: 10.1088/0256-307X/33/7/077402
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Common Electronic Features and Electronic Nematicity in Parent Compounds of Iron-Based Superconductors and FeSe/SrTiO$_3$ Films Revealed by Angle-Resolved Photoemission Spectroscopy
De-Fa Liu1, Lin Zhao1, Shao-Long He1, Yong Hu1, Bing Shen1, Jian-Wei Huang1, Ai-Ji Liang1, Yu Xu1, Xu Liu1, Jun-Feng He1, Dai-Xiang Mou1, Shan-Yu Liu1, Hai-Yun Liu1, Guo-Dong Liu1, Wen-Hao Zhang2, Fang-Sen Li2, Xu-Cun Ma2, Qi-Kun Xue2, Xian-Hui Chen3, Gen-Fu Chen1, Li Yu1, Jun Zhang1, Zu-Yan Xu4, Chuang-Tian Chen4, Xing-Jiang Zhou1,5**
1National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2State Key Lab of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084
3Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, Hefei 230026
4Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190
5Collaborative Innovation Center of Quantum Matter, Beijing 100871
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De-Fa Liu, Lin Zhao, Shao-Long He et al  2016 Chin. Phys. Lett. 33 077402
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Abstract We report comprehensive angle-resolved photoemission investigations on the electronic structures and nematicity of the parent compounds of the iron-based superconductors including CeFeAsO, BaFe$_2$As$_2$, NaFeAs, FeSe and undoped FeSe/SrTiO$_3$ films with 1, 2 and 20 layers. While the electronic structure near the Brillouin zone center ${\it \Gamma}$ varies dramatically among different materials, the electronic structure near the Brillouin zone corners ($M$ points), as well as their temperature dependence, are rather similar. The electronic structure near the zone corners is dominated by the electronic nematicity that gives rise to a band splitting of the $d_{xz}$ and $d_{yz}$ bands below the nematic transition temperature. A clear relation is observed between the band splitting magnitude and the onset temperature of nematicity. Our results may shed light on the origin of nematicity, its effect on the electronic structures, and its relation with superconductivity in the iron-based superconductors.
Received: 25 May 2016      Published: 01 August 2016
PACS:  74.70.-b (Superconducting materials other than cuprates)  
  74.25.Jb (Electronic structure (photoemission, etc.))  
  79.60.-i (Photoemission and photoelectron spectra)  
  71.20.-b (Electron density of states and band structure of crystalline solids)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/33/7/077402       OR      https://cpl.iphy.ac.cn/Y2016/V33/I07/077402
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De-Fa Liu
Lin Zhao
Shao-Long He
Yong Hu
Bing Shen
Jian-Wei Huang
Ai-Ji Liang
Yu Xu
Xu Liu
Jun-Feng He
Dai-Xiang Mou
Shan-Yu Liu
Hai-Yun Liu
Guo-Dong Liu
Wen-Hao Zhang
Fang-Sen Li
Xu-Cun Ma
Qi-Kun Xue
Xian-Hui Chen
Gen-Fu Chen
Li Yu
Jun Zhang
Zu-Yan Xu
Chuang-Tian Chen
Xing-Jiang Zhou
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