单晶Sr1-xKxFe2As2中电子结构异常的掺杂依赖性以及自旋密度波和超导相的共存

Unusual doping dependence of the electronic structure and coexistence of spin-density-wave and superconductor phases in single crystalline Sr1-xKxFe2As2.

作者信息

Zhang Y, Wei J, Ou H W, Zhao J F, Zhou B, Chen F, Xu M, He C, Wu G, Chen H, Arita M, Shimada K, Namatame H, Taniguchi M, Chen X H, Feng D L

机构信息

Department of Physics, Surface Physics Laboratory, Fudan University, Shanghai 200433, People's Republic of China.

出版信息

Phys Rev Lett. 2009 Mar 27;102(12):127003. doi: 10.1103/PhysRevLett.102.127003. Epub 2009 Mar 26.

DOI:10.1103/PhysRevLett.102.127003

PMID:19392313

Abstract

The nature of the spin-density wave (SDW) and its relation with superconductivity are crucial issues in the newly discovered iron-pnictide superconductors. Particularly, it is unclear whether the superconducting phase and SDW are truly exclusive from each other. We here report splittings of the band structures in Sr1-xKxFe2As2 (x=0, 0.1, 0.18), and their unusual doping dependence. Our data on single crystalline samples prove that the SDW and superconductivity could coexist in iron pnictides.

摘要

自旋密度波（SDW）的本质及其与超导性的关系是新发现的铁基超导材料中的关键问题。特别是，超导相和SDW是否真的相互排斥尚不清楚。我们在此报告了Sr1-xKxFe2As2（x = 0、0.1、0.18）能带结构的分裂及其异常的掺杂依赖性。我们对单晶样品的数据证明，SDW和超导性可以在铁基化合物中共存。