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Electronic origin of high-temperature superconductivity in single-layer FeSe superconductor

2012; Nature Portfolio; Volume: 3; Issue: 1 Linguagem: Inglês

10.1038/ncomms1946

2041-1723

Li D, Wenhao Zhang, Daixiang Mou, Jun-Feng He, Yunbo Ou, Qingyan Wang, Zhi Li, Lili Wang, Lin Zhao, Shaolong He, Y. Y. Peng, Xu Liu, Chaoyu Chen, Li Yu, Guodong Liu, Xiaoli Dong, Jun Zhang, Chuangtian Chen, Zuyan Xu, Jiangping Hu, Xi Chen, Xucun Ma, Qi‐Kun Xue, Xingjiang Zhou,

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The recent discovery of high-temperature superconductivity in iron-based compounds has attracted much attention. How to further increase the superconducting transition temperature (Tc) and how to understand the superconductivity mechanism are two prominent issues facing the current study of iron-based superconductors. The latest report of high-Tc 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 Tc~ 55 K. These results have established a clear case that such a simple electronic structure is compatible with high-Tc superconductivity in iron-based superconductors. The exact mechanism for superconductivity in iron-based superconductors remains elusive, but is thought to involve complex interactions between many orbitals. Using angle-resolved photoelectron spectroscopy, Liuet al. report the electronic structure of the single-layer parent compound FeSe.