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

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

doi:10.1088/0256-307X/36/6/067402

Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi₂Sr₂CaCu₂O_8+δ Superconductor

Journal Article · Wed May 01 00:00:00 EDT 2019 · Chinese Physics Letters

DOI:https://doi.org/10.1088/0256-307X/36/6/067402· OSTI ID:1524560

Ai, Ping ^[1]; Gao, Qiang ^[1]; Liu, Jing ^[1]; Zhang, Yuxiao ^[1]; Li, Cong ^[1]; Huang, Jianwei ^[1]; Song, Chunyao ^[1]; Yan, Hongtao ^[1]; Zhao, Lin ^[1]; Liu, Guo -Dong ^[2]; ^[3]; Zhang, Feng -Feng ^[4]; Yang, Feng ^[4]; Peng, Qin -Jun ^[4]; Xu, Zu -Yan ^[4]; Zhou, Xing -Jiang ^[5]

Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Lab, Dongguan (China)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Lab., Dongguan (China); Beijing Academy of Quantum Information Sciences, Beijing (China)

High resolution laser-based angle-resolved photoemission measurements are carried out on an overdoped superconductor Bi₂Sr₂CaCu₂O_8+δ with a T_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. Furthermore, 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.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1524560

Alternate ID(s):: OSTI ID: 23000962

Report Number(s):: BNL--211735-2019-JAAM

Journal Information:: Chinese Physics Letters, Journal Name: Chinese Physics Letters Journal Issue: 6 Vol. 36; ISSN 0256-307X

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Selective hybridization between the main band and the superstructure band in the Bi 2 Sr 2 CaCu 2 O 8 + δ superconductor Gao, Qiang; Yan, Hongtao; Liu, Jing Physical Review B, Vol. 101, Issue 1 https://doi.org/10.1103/physrevb.101.014513	journal	January 2020

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