Extraction of normal electron self-energy and pairing self-energy in the superconducting state of the Bi2Sr2CaCu2O8 superconductor via laser-based angle-resolved photoemission
Wentao Zhang, Jin Mo Bok, Jae Hyun Yun, Junfeng He, Guodong Liu, Lin Zhao, Haiyun Liu, Jianqiao Meng, Xiaowen Jia, Yingying Peng, Daixiang Mou, Shanyu Liu, Li Yu, Shaolong He, Xiaoli Dong, Jun Zhang, J. S. Wen, Z. J. Xu, G. D. Gu, Guiling Wang, Yong Zhu, Xiaoyang Wang, Qinjun Peng, Zhimin Wang, Shenjin Zhang, Feng Yang, Chuangtian Chen, Zuyan Xu, H.-Y. Choi, C. M. Varma, X. J. Zhou
DOI 10.1103/PhysRevB.85.064514 · Physical Review B
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Abstract
Super-high-resolution laser-based angle-resolved photoemission measurements have been performed on a high-temperature superconductor, Bi2Sr2CaCu2O8. The band back-bending characteristic of the Bogoliubov-like quasiparticle dispersion is clearly revealed at low temperature in the superconducting state, which gives rise to two peaks in the momentum distribution curves. This makes it possible to experimentally extract the normal electron self-energy and pairing self-energy in the superconducting state. The resultant normal and pairing self-energies exhibit features at ∼54 and ∼40 meV, in addition to the superconducting gap-induced structure at lower binding energy and a broad featureless structure at higher binding energy. This information can be used to further determine the Bosonic spectral function that will provide key insight and constraints on the origin of electron pairing in high-temperature superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89 | Pressure not reported | unknown |
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