Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi2Sr2CaCu2O8+δ Superconductor

Ping Ai; Guo-Dong Liu; Gen-Da Gu; Feng-Feng Zhang; Feng Yang; Qin-Jun Peng; Zu-Yan Xu; Xing-Jiang Zhou; Qiang Gao; Jing Liu; Yuxiao Zhang; Cong Li; Jianwei Huang; Chunyao Song; Hongtao Yan; Lin Zhao

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Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi2Sr2CaCu2O8+δ Superconductor

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High resolution laser-based angle-resolved photoemission measurements are carried out on an overdoped superconductor Bi2Sr2CaCu2O8+δ with a Tc 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 me V.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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来源
《中国物理快报：英文版》 |2019年第6期|66-74|共9页
作者
Ping Ai; Guo-Dong Liu; Gen-Da Gu; Feng-Feng Zhang; Feng Yang; Qin-Jun Peng; Zu-Yan Xu; Xing-Jiang Zhou; Qiang Gao; Jing Liu; Yuxiao Zhang; Cong Li; Jianwei Huang; Chunyao Song; Hongtao Yan; Lin Zhao;
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作者单位

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

Songshan Lake Materials Laboratory, Dongguan 523808;

Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA;

Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190;

Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190;

Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190;

Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190;

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

Songshan Lake Materials Laboratory, Dongguan 523808;

Beijing Academy of Quantum Information Sciences, Beijing 100193;

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

National Lab for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100190;

University of Chinese Academy of Sciences, Beijing 100049;

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Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi2Sr2CaCu2O8+δ Superconductor

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