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

Abstract

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 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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]; ORCiD logo [3];  [4];  [4];  [4];  [4];  [5]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Songshan Lake Materials Lab, Dongguan (China)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
  5. 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)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1524560
Report Number(s):
BNL-211735-2019-JAAM
Journal ID: ISSN 0256-307X
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Chinese Physics Letters
Additional Journal Information:
Journal Volume: 36; Journal Issue: 6; Journal ID: ISSN 0256-307X
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

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, and Zhou, Xing -Jiang. Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi2Sr2CaCu2O8+δ Superconductor. United States: N. p., 2019. Web. https://doi.org/10.1088/0256-307X/36/6/067402.
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. Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi2Sr2CaCu2O8+δ Superconductor. United States. https://doi.org/10.1088/0256-307X/36/6/067402
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, and Zhou, Xing -Jiang. Wed . "Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi2Sr2CaCu2O8+δ Superconductor". United States. https://doi.org/10.1088/0256-307X/36/6/067402. https://www.osti.gov/servlets/purl/1524560.
@article{osti_1524560,
title = {Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in Bi2Sr2CaCu2O8+δ Superconductor},
author = {Ai, Ping and Gao, Qiang and Liu, Jing and Zhang, Yuxiao and Li, Cong and Huang, Jianwei and Song, Chunyao and Yan, Hongtao and Zhao, Lin and Liu, Guo -Dong and Gu, Gen -Da and Zhang, Feng -Feng and Yang, Feng and Peng, Qin -Jun and Xu, Zu -Yan and Zhou, Xing -Jiang},
abstractNote = {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 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.},
doi = {10.1088/0256-307X/36/6/067402},
journal = {Chinese Physics Letters},
number = 6,
volume = 36,
place = {United States},
year = {2019},
month = {5}
}

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    Works referencing / citing this record:

    Selective hybridization between the main band and the superstructure band in the Bi 2 Sr 2 CaCu 2 O 8 + δ superconductor
    journal, January 2020