Multiple Nodeless Superconducting Gaps in (Ba0:6K0:4)Fe2As2 Superconductor from Angle-Resolved Photoemission Spectroscopy
作者： Chen Gen-Fu , Zhou Xing-Jiang , Chen Chuang-Tian , Meng Jian-Qiao , Wang Gui-Ling
DOI: 10.1088/0256-307X/25/12/061
关键词:
摘要: High resolution angle-resolved photoemission measurements have been carried out to study the superconducting gap in (Ba0.6K0.4)Fe2As2 superconductor with Te = 35 K. Two hole-like Fermi surface sheets around I' point exhibit different gaps. The inner sheet shows larger (10 ~ 12 meV) and slightly momentum-dependent while outer one has smaller (7 8meV) nearly isotropic gap. lack of node both favours s-wave symmetry. Superconducting opening is also observed at M(π, π) point. two spots near M are gapped below but persists above Te. rich detailed information will provide key insights constraints understanding pairing mechanism iron-based superconductors.
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