| Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi_2Sr_2CaCu_2O_(8+δ) Superconductor |
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| 引用本文： | 艾平,高强,刘静,张玉晓,李聪,黄建伟,宋春尧,闫宏涛,赵林,刘国东,顾根大,张丰丰,杨峰,彭钦军,许祖彦,周兴江.Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi_2Sr_2CaCu_2O_(8+δ) Superconductor[J].中国物理快报,2019(6). |
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| 作者姓名： | 艾平 高强 刘静 张玉晓 李聪 黄建伟 宋春尧 闫宏涛 赵林 刘国东 顾根大 张丰丰 杨峰 彭钦军 许祖彦 周兴江 |
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| 摘 要： | High resolution laser-based angle-resolved photoemission measurements are carried out on an overdoped superconductor Bi_2Sr_2CaCu_2O_(8+)with a_(c )of 75 K.Two Fermi surface sheets caused by bilayer splitting are clearly identified with rather different doping levels:the bonding sheet corresponds to a doping level of 0.14,which is slightly underdoped while the antibonding sheet has a doping of 0.27 that is heavily overdoped,giving an overall doping level of 0.20 for the sample.Different superconducting gap sizes on the two Fermi surface sheets are revealed.The superconducting gap on the antibonding Fermi surface sheet follows a standard d-wave form while it deviates from the standard d-wave form for the bonding Fermi surface sheet.The maximum gap difference between the two Fermi surface sheets near the antinodal region is～2 meV.These observations provide important information for studying the relationship between the Fermi surface topology and superconductivity,and the layer-dependent superconductivity in high temperature cuprate superconductors.
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