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Chin. Phys. B, 2020, Vol. 29(4): 047401    DOI: 10.1088/1674-1056/ab75d4
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Electronic structure and spatial inhomogeneity of iron-based superconductor FeS

Chengwei Wang(王成玮)1,2,3, Meixiao Wang(王美晓)2, Juan Jiang(姜娟)2,4, Haifeng Yang(杨海峰)2, Lexian Yang(杨乐仙)5, Wujun Shi(史武军)2, Xiaofang Lai(赖晓芳)6, Sung-Kwan Mo4, Alexei Barinov7, Binghai Yan(颜丙海)8, Zhi Liu(刘志)1,2, Fuqiang Huang(黄富强)6,9, Jinfeng Jia(贾金峰)10, Zhongkai Liu(柳仲楷)2, Yulin Chen(陈宇林)2,5,11
1 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology(SIMIT), Chinese Academy of Sciences, Shanghai 200050, China;
2 School of Physical Science and Technology, ShanghaiTech University, CAS-Shanghai Science Research Center, Shanghai 200031, China;
3 University of Chinese Academic of Sciences, Beijing 100049, China;
4 Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;
5 State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics and Collaborative Innovation Center for Quantum Matter, Tsinghua University, Beijing 100084, China;
6 Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;
7 Elettra-Sincrotrone Trieste ScPA, Trieste, Basovizza 34149, Italy;
8 Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany;
9 State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China 10 Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;
11 Physics Department, Oxford University, Oxford, OX1 3PU, UK
Abstract  Iron-based superconductor family FeX (X =S, Se, Te) has been one of the research foci in physics and material science due to their record-breaking superconducting temperature (FeSe film) and rich physical phenomena. Recently, FeS, the least studied FeX compound (due to the difficulty in synthesizing high quality macroscopic crystals) attracted much attention because of its puzzling superconducting pairing symmetry. In this work, combining scanning tunneling microscopy and angle resolved photoemission spectroscopy (ARPES) with sub-micron spatial resolution, we investigate the intrinsic electronic structures of superconducting FeS from individual single crystalline domains. Unlike FeTe or FeSe, FeS remains identical tetragonal structure from room temperature down to 5 K, and the band structures observed can be well reproduced by our ab-initio calculations. Remarkably, mixed with the 1×1 tetragonal metallic phase, we also observe the coexistence of √5×√5 reconstructed insulating phase in the crystal, which not only helps explain the unusual properties of FeS, but also demonstrates the importance of using spatially resolved experimental tools in the study of this compound.
Keywords:  angle-resolved photoemission with spatially resolution      scanning tunneling microscopy      iron-based superconductor      electronic band structure  
Received:  31 December 2019      Revised:  01 February 2020      Published:  05 April 2020
PACS:  74.25.Jb (Electronic structure (photoemission, etc.))  
  71.27.+a (Strongly correlated electron systems; heavy fermions)  
Fund: Project supported by CAS-Shanghai Science Research Center, China (Grant No. CAS-SSRC-YH-2015-01), the National Key R&D Program of China (Grant No. 2017YFA0305400), the National Natural Science Foundation of China (Grant Nos. 11674229, 11227902, and 11604207), the EPSRC Platform Grant (Grant No. EP/M020517/1), Hefei Science Center, Chinese Academy of Sciences (Grant No. 2015HSC-UE013), Science and Technology Commission of Shanghai Municipality, China (Grant No. 14520722100), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB04040200).
Corresponding Authors:  Zhongkai Liu, Yulin Chen     E-mail:  liuzhk@shanghaitech.edu.cn;yulin.chen@physics.ox.ac.uk

Cite this article: 

Chengwei Wang(王成玮), Meixiao Wang(王美晓), Juan Jiang(姜娟), Haifeng Yang(杨海峰), Lexian Yang(杨乐仙), Wujun Shi(史武军), Xiaofang Lai(赖晓芳), Sung-Kwan Mo, Alexei Barinov, Binghai Yan(颜丙海), Zhi Liu(刘志), Fuqiang Huang(黄富强), Jinfeng Jia(贾金峰), Zhongkai Liu(柳仲楷), Yulin Chen(陈宇林) Electronic structure and spatial inhomogeneity of iron-based superconductor FeS 2020 Chin. Phys. B 29 047401

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