论文类型：期刊论文
第一作者：Tian Qian
合写作者：Hong Ding,X-L Chen,J-G Guo,Zhong Fang,Xi Dai,Gang Xu,P Richard,Peng Zhang,W-C Jin,X-P Wang
发表刊物：Physical Review Letters
收录刊物：SCI
学科门类：物理学
文献类型：J
卷号：106
期号：18
页面范围：187001
ISSN号：0031-9007
发表时间：2011-05-03
影响因子：7.37
摘要：We have performed an angle-resolved photoemission spectroscopy study of the new iron-based superconductor K 0.8 Fe 1.7 Se 2 (T c∼ 30 K). Clear band dispersion is observed with the overall bandwidth renormalized by a factor of 2.5 compared to our local density approximation calculations, indicating relatively strong correlation effects. Only an electronlike band crosses the Fermi energy, forming a nearly circular Fermi surface (FS) at M (π, 0). The holelike band at Γ sinks∼ 90 meV below the Fermi energy, with an indirect band gap of 30 meV, to the bottom of the electronlike band. The observed FS topology in this superconductor favors (π, π) inter-FS scattering between the electronlike FSs at the M points, in sharp contrast to other iron-based superconductors which favor (π, 0) inter-FS scattering between holelike and electronlike FSs.
发布期刊链接：https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.106.187001