Electronic structure and spatial inhomogeneity of iron-based superconductor FeS

作     者：王成玮 王美晓 姜娟 杨海峰 杨乐仙 史武军 赖晓芳 Sung-Kwan Mo Alexei Barinov 颜丙海 刘志 黄富强 贾金峰 柳仲楷 陈宇林 Chengwei Wang;Meixiao Wang;Juan Jiang;Haifeng Yang;Lexian Yang;Wujun Shi;Xiaofang Lai;Sung-Kwan Mo;Alexei Barinov;Binghai Yan;Zhi Liu;Fuqiang Huang;Jinfeng Jia;Zhongkai Liu;Yulin Chen

作者机构：State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of SciencesShanghai 200050China School of Physical Science and TechnologyShanghaiTech UniversityCAS-Shanghai Science Research CenterShanghai 200031China University of Chinese Academic of SciencesBeijing 100049China Advanced Light SourceLawrence Berkeley National LaboratoryBerkeleyCA 94720USA State Key Laboratory of Low Dimensional Quantum PhysicsDepartment of Physics and Collaborative Innovation Center for Quantum MatterTsinghua UniversityBeijing 100084China Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Elettra-Sincrotrone Trieste ScPATriesteBasovizza 34149Italy Max Planck Institute for Chemical Physics of SolidsD-01187 DresdenGermany State Key Laboratory of High Performance Ceramics and Superfine MicrostructureShanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education)Department of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Physics DepartmentOxford UniversityOxfordOX13PUUK 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2020年第29卷第4期

页      面：110-115页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0704[理学-天文学] 0702[理学-物理学] 

基　　金：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) the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant No.XDB04040200)。 

主　　题：angle-resolved photoemission with spatially resolution scanning tunneling microscopy iron-based superconductor electronic band structure 

摘      要：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 Fe X 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.