Distinct fermi surface topology and nodeless superconducting gap in a (Tl0.58Rb0.42)Fe1.72Se2 superconductor |
| |
Authors: | Mou Daixiang Liu Shanyu Jia Xiaowen He Junfeng Peng Yingying Zhao Lin Yu Li Liu Guodong He Shaolong Dong Xiaoli Zhang Jun Wang Hangdong Dong Chiheng Fang Minghu Wang Xiaoyang Peng Qinjun Wang Zhimin Zhang Shenjin Yang Feng Xu Zuyan Chen Chuangtian Zhou X J |
| |
Affiliation: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. |
| |
Abstract: | High resolution angle-resolved photoemission measurements have been carried out to study the electronic structure and superconducting gap of the (Tl0.58Rb0.42)Fe1.72Se2 superconductor with a T(c) = 32 K. The Fermi surface topology consists of two electronlike Fermi surface sheets around the Γ point which is distinct from that in all other iron-based superconductors reported so far. The Fermi surface around the M point shows a nearly isotropic superconducting gap of ~12 meV. The large Fermi surface near the Γ point also shows a nearly isotropic superconducting gap of ~15 meV, while no superconducting gap opening is clearly observed for the inner tiny Fermi surface. Our observed new Fermi surface topology and its associated superconducting gap will provide key insights and constraints into the understanding of the superconductivity mechanism in iron-based superconductors. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |