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
- Univ. of Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics and National Lab. for Superconductivity
- Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics and National Lab. for Superconductivity
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics
- Chinese Academy of Sciences (CAS), Beijing (China). Technical Inst. of Physics and Chemistry
- 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)
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.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); National Basic Research Program of China; Chinese Academy of Sciences
- Grant/Contract Number:
- SC0012704; 2016YFA0300300; 11334010; 2015CB921300; XDB07020300
- OSTI ID:
- 1430861
- Report Number(s):
- BNL-203394-2018-JAAM
- Journal Information:
- Chinese Physics Letters, Vol. 35, Issue 1; ISSN 0256-307X
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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