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Title: Temperature Evolution of Energy Gap and Band Structure in the Superconducting and Pseudogap States of Bi 2Sr 2CaCu 2O 8+δ Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy

For this study, we carry out detailed momentum-dependent and temperature-dependent measurements on Bi 2Sr 2CaCu 2O 8+δ (Bi2212) superconductor in the superconducting and pseudogap states by super-high resolution laser-based angle-resolved photoemission spectroscopy. The precise determination of the superconducting gap for the nearly optimally doped Bi2212 (T c=91 K) at low temperature indicates that the momentum-dependence of the superconducting gap deviates from the standard d-wave form (cos(2Φ)). It can be alternatively fitted by including a high-order term (cos(6Φ)) in which the next nearest-neighbor interaction is considered. We find that the band structure near the antinodal region smoothly evolves across the pseudogap temperature without a signature of band reorganization which is distinct from that found in Bi 2Sr 2CuO 6+δ superconductors. This indicates that the band reorganization across the pseudogap temperature is not a universal behavior in cuprate superconductors. These results provide new insights in understanding the nature of the superconducting gap and pseudogap in high-temperature cuprate superconductors.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ; ORCiD logo [3] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [4] ;  [5]
  1. Univ. of Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics and National Lab. for Superconductivity
  2. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics and National Lab. for Superconductivity
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics
  4. Chinese Academy of Sciences (CAS), Beijing (China). Technical Inst. of Physics and Chemistry
  5. Univ. of Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics and National Lab. for Superconductivity; Collaborative Innovation Center of Quantum Matter (CICQM), Beijing (China)
Publication Date:
Report Number(s):
BNL-203394-2018-JAAM
Journal ID: ISSN 0256-307X
Grant/Contract Number:
SC0012704; 2016YFA0300300; 11334010; 2015CB921300; XDB07020300
Type:
Accepted Manuscript
Journal Name:
Chinese Physics Letters
Additional Journal Information:
Journal Volume: 35; Journal Issue: 1; Journal ID: ISSN 0256-307X
Publisher:
IOP Publishing
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Key Research and Development Program of China; National Natural Science Foundation of China (NNSFC); National Basic Research Program of China; Chinese Academy of Sciences
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1430861

Sun, Xuan, Zhang, Wen-Tao, Zhao, Lin, Liu, Guo-Dong, Gu, Gen-Da, Peng, Qin-Jun, Wang, Zhi-Min, Zhang, Shen-Jin, Yang, Feng, Chen, Chuang-Tian, Xu, Zu-Yan, and Zhou, Xing-Jiang. Temperature Evolution of Energy Gap and Band Structure in the Superconducting and Pseudogap States of Bi2Sr2CaCu2O8+δ Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy. United States: N. p., Web. doi:10.1088/0256-307X/35/1/017401.
Sun, Xuan, Zhang, Wen-Tao, Zhao, Lin, Liu, Guo-Dong, Gu, Gen-Da, Peng, Qin-Jun, Wang, Zhi-Min, Zhang, Shen-Jin, Yang, Feng, Chen, Chuang-Tian, Xu, Zu-Yan, & Zhou, Xing-Jiang. Temperature Evolution of Energy Gap and Band Structure in the Superconducting and Pseudogap States of Bi2Sr2CaCu2O8+δ Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy. United States. doi:10.1088/0256-307X/35/1/017401.
Sun, Xuan, Zhang, Wen-Tao, Zhao, Lin, Liu, Guo-Dong, Gu, Gen-Da, Peng, Qin-Jun, Wang, Zhi-Min, Zhang, Shen-Jin, Yang, Feng, Chen, Chuang-Tian, Xu, Zu-Yan, and Zhou, Xing-Jiang. 2017. "Temperature Evolution of Energy Gap and Band Structure in the Superconducting and Pseudogap States of Bi2Sr2CaCu2O8+δ Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy". United States. doi:10.1088/0256-307X/35/1/017401.
@article{osti_1430861,
title = {Temperature Evolution of Energy Gap and Band Structure in the Superconducting and Pseudogap States of Bi2Sr2CaCu2O8+δ Superconductor Revealed by Laser-Based Angle-Resolved Photoemission Spectroscopy},
author = {Sun, Xuan and Zhang, Wen-Tao and Zhao, Lin and Liu, Guo-Dong and Gu, Gen-Da and Peng, Qin-Jun and Wang, Zhi-Min and Zhang, Shen-Jin and Yang, Feng and Chen, Chuang-Tian and Xu, Zu-Yan and Zhou, Xing-Jiang},
abstractNote = {For this study, we carry out detailed momentum-dependent and temperature-dependent measurements on Bi2Sr2CaCu2O8+δ (Bi2212) superconductor in the superconducting and pseudogap states by super-high resolution laser-based angle-resolved photoemission spectroscopy. The precise determination of the superconducting gap for the nearly optimally doped Bi2212 (Tc=91 K) at low temperature indicates that the momentum-dependence of the superconducting gap deviates from the standard d-wave form (cos(2Φ)). It can be alternatively fitted by including a high-order term (cos(6Φ)) in which the next nearest-neighbor interaction is considered. We find that the band structure near the antinodal region smoothly evolves across the pseudogap temperature without a signature of band reorganization which is distinct from that found in Bi2Sr2CuO6+δ superconductors. This indicates that the band reorganization across the pseudogap temperature is not a universal behavior in cuprate superconductors. These results provide new insights in understanding the nature of the superconducting gap and pseudogap in high-temperature cuprate superconductors.},
doi = {10.1088/0256-307X/35/1/017401},
journal = {Chinese Physics Letters},
number = 1,
volume = 35,
place = {United States},
year = {2017},
month = {12}
}