| 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):66-74. |
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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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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 11888101;the National Key Research and Development Program of China under Grant Nos 2016YFA0300300 and 2017YFA0302900;the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(XDB25000000);the Youth Innovation Promotion Association of CAS under Grant No2017013;the Research Program of Beijing Academy of Quantum Information Sciences under Grant No Y18G06;supported by the Office of Basic Energy Sciences,U.S.Department of Energy(DOE)under Contract No de-sc0012704 |
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| 摘 要： | High resolution laser-based angle-resolved photoemission measurements are carried out on an overdoped superconductor Bi_2Sr_2CaCu_2O8+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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| 关 键 词： | DISTINCT Superconducting Gap Bilayer-Split FERMI Surface SHEETS Bi2Sr2CaCu2O8+δSuperconductor |
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