title: Electronic origin of high-temperature superconductivity in single-layer FeSe superconductor.
abstract: The recent discovery of high-temperature superconductivity in iron-based compounds has attracted much attention. How to further increase the superconducting transition temperature (T(c)) and how to understand the superconductivity mechanism are two prominent issues facing the current study of iron-based superconductors. The latest report of high-T(c) superconductivity in a single-layer FeSe is therefore both surprising and significant. Here we present investigations of the electronic structure and superconducting gap of the single-layer FeSe superconductor. Its Fermi surface is distinct from other iron-based superconductors, consisting only of electron-like pockets near the zone corner without indication of any Fermi surface around the zone centre. Nearly isotropic superconducting gap is observed in this strictly two-dimensional system. The temperature dependence of the superconducting gap gives a transition temperature T(c)~ 55 K. These results have established a clear case that such a simple electronic structure is compatible with high-T(c) superconductivity in iron-based superconductors.
authors: National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors: Defa
authors: D
authors: Liu
authors: Wenhao
authors: W
authors: Zhang
authors: Daixiang
authors: D
authors: Mou
authors: Junfeng
authors: J
authors: He
authors: Yun-Bo
authors: YB
authors: Ou
authors: Qing-Yan
authors: QY
authors: Wang
authors: Zhi
authors: Z
authors: Li
authors: Lili
authors: L
authors: Wang
authors: Lin
authors: L
authors: Zhao
authors: Shaolong
authors: S
authors: He
authors: Yingying
authors: Y
authors: Peng
authors: Xu
authors: X
authors: Liu
authors: Chaoyu
authors: C
authors: Chen
authors: Li
authors: L
authors: Yu
authors: Guodong
authors: G
authors: Liu
authors: Xiaoli
authors: X
authors: Dong
authors: Jun
authors: J
authors: Zhang
authors: Chuangtian
authors: C
authors: Chen
authors: Zuyan
authors: Z
authors: Xu
authors: Jiangping
authors: J
authors: Hu
authors: Xi
authors: X
authors: Chen
authors: Xucun
authors: X
authors: Ma
authors: Qikun
authors: Q
authors: Xue
authors: X J
authors: XJ
authors: Zhou
mesh_terms: D004553:Electric Conductivity; D006358:Hot Temperature; D058085:Iron Compounds / Q000737:chemistry*; D012643:Selenium / Q000737:chemistry*
chemical_list: D058085:Iron Compounds; D012643:Selenium