期刊
CHINESE PHYSICS LETTERS
卷 35, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0256-307X/35/1/017401
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资金
- National Key Research and Development Program of China [2016YFA0300300]
- National Natural Science Foundation of China [11334010]
- National Basic Research Program of China [2015CB921300]
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB07020300]
We carry out detailed momentum-dependent and temperature-dependent measurements on Bi2Sr2CaCu2O8+delta (Bi2212) superconductor in the superconducting and pseudogap states by super-high resolution laser-based angleresolved 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(2 Phi)). It can be alternatively fitted by including a high-order term (cos(6 Phi)) 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+delta 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.
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