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A unifying phase diagram with correlation-driven superconductor-to-insulator transition for the 122*series of iron chalcogenides

文献类型：期刊论文

作者Niu, X. H.1,2,3; Chen, S. D.1,2; Jiang, J.1,2,3; Ye, Z. R.1,2,3; Yu, T. L.1,2,3; Xu, D. F.1,2,3; Xu, M.1,2,3; Feng, Y.1,2; Yan, Y. J.1,2,3; Xie, B. P.1,2,3
刊名PHYSICAL REVIEW B
出版日期2016-02-16
卷号93期号:5页码:1-8
DOI10.1103/PhysRevB.93.054516
文献子类Article
英文摘要The 122* series of iron chalcogenide superconductors, for example KxFe2-ySe2, only possesses electron Fermi pockets. Their distinctive electronic structure challenges the picture built upon iron pnictide superconductors, where both electron and hole Fermi pockets coexist. However, partly due to the intrinsic phase separation in this family of compounds, many aspects of their behavior remain elusive. In particular, the evolution of the 122* series of iron chalcogenides with chemical substitution still lacks a microscopic and unified interpretation. Using angle-resolved photoemission spectroscopy, we studied a major fraction of 122* iron chalcogenides, including the isovalently "doped" KxFe2-ySe2-zSz, RbxFe2-ySe2-zTez, and (Tl, K)(x)Fe2-ySe2-zSz. We found that the bandwidths of the low energy Fe 3d bands in these materials depend on doping; and more crucially, as the bandwidth decreases, the ground state evolves from a metal to a superconductor, and eventually to an insulator, yet the Fermi surface in the metallic phases is unaffected by the isovalent dopants. Moreover, the correlation-driven insulator found here with small band filling may be a novel insulating phase. Our study shows that almost all the known 122*-series iron chalcogenides can be understood via one unifying phase diagram which implies that moderate correlation strength is beneficial for the superconductivity.
WOS关键词HIGH-TEMPERATURE SUPERCONDUCTORS ; FERMI-SURFACE ; PNICTIDES ; FILMS
WOS研究方向Physics
语种英语
WOS记录号WOS:000370244000007
资助机构National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Basic Research Program of China (973 Program)(2012CB921402 ; National Basic Research Program of China (973 Program)(2012CB921402 ; National Basic Research Program of China (973 Program)(2012CB921402 ; National Basic Research Program of China (973 Program)(2012CB921402 ; 2012CB927401 ; 2012CB927401 ; 2012CB927401 ; 2012CB927401 ; 2011CBA00106 ; 2011CBA00106 ; 2011CBA00106 ; 2011CBA00106 ; 2011CBA00103 ; 2011CBA00103 ; 2011CBA00103 ; 2011CBA00103 ; 2012CB821404 ; 2012CB821404 ; 2012CB821404 ; 2012CB821404 ; 2015CB921004) ; 2015CB921004) ; 2015CB921004) ; 2015CB921004) ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Science Foundation of China ; National Basic Research Program of China (973 Program)(2012CB921402 ; National Basic Research Program of China (973 Program)(2012CB921402 ; National Basic Research Program of China (973 Program)(2012CB921402 ; National Basic Research Program of China (973 Program)(2012CB921402 ; 2012CB927401 ; 2012CB927401 ; 2012CB927401 ; 2012CB927401 ; 2011CBA00106 ; 2011CBA00106 ; 2011CBA00106 ; 2011CBA00106 ; 2011CBA00103 ; 2011CBA00103 ; 2011CBA00103 ; 2011CBA00103 ; 2012CB821404 ; 2012CB821404 ; 2012CB821404 ; 2012CB821404 ; 2015CB921004) ; 2015CB921004) ; 2015CB921004) ; 2015CB921004)
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/22296]  
专题合肥物质科学研究院_中科院强磁场科学中心
作者单位1.Fudan Univ, State Key Lab Surface Phys, Dept Phys, Shanghai 200433, Peoples R China
2.Fudan Univ, Adv Mat Lab, Shanghai 200433, Peoples R China
3.Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
4.Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
5.Collaborat Innovat Ctr Quantum Matter, Beijing 100190, Peoples R China
6.Zhejiang Univ, Dept Phys, Hangzhou 310027, Zhejiang, Peoples R China
7.Chinese Acad Sci, High Magnet Field Lab, Hefei 230026, Peoples R China
8.Univ Sci & Technol China, Hefei 230026, Peoples R China
9.Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 Niu, X. H.,Chen, S. D.,Jiang, J.,et al. A unifying phase diagram with correlation-driven superconductor-to-insulator transition for the 122*series of iron chalcogenides[J]. PHYSICAL REVIEW B,2016,93(5):1-8.
APA Niu, X. H..,Chen, S. D..,Jiang, J..,Ye, Z. R..,Yu, T. L..,...&Feng, D. L..(2016).A unifying phase diagram with correlation-driven superconductor-to-insulator transition for the 122*series of iron chalcogenides.PHYSICAL REVIEW B,93(5),1-8.
MLA Niu, X. H.,et al."A unifying phase diagram with correlation-driven superconductor-to-insulator transition for the 122*series of iron chalcogenides".PHYSICAL REVIEW B 93.5(2016):1-8.

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