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

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

doi:10.1103/PhysRevLett.102.127003

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

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

Authors

Y Zhang¹, J Wei, H W Ou, J F Zhao, B Zhou, F Chen, M Xu, C He, G Wu, H Chen, M Arita, K Shimada, H Namatame, M Taniguchi, X H Chen, D L Feng

Affiliation

¹ Department of Physics, Surface Physics Laboratory, Fudan University, Shanghai 200433, People's Republic of China.

PMID: 19392313
DOI: 10.1103/PhysRevLett.102.127003

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.