Monotonic d-wave superconducting gap of the optimally doped Bi2Sr1.6La0.4CuO6 superconductor by laser-based angle-resolved photoemission spectroscopy
Jianqiao Meng, Wentao Zhang, Guodong Liu, Lin Zhao, Haiyun Liu, Xiaowen Jia, Wei Lu, Xiaoli Dong, Guiling Wang, Hongbo Zhang, Yong Zhou, Yong Zhu, Xiaoyang Wang, Zhongxian Zhao, Zuyan Xu, Chuangtian Chen, X. J. Zhou
DOI 10.1103/PhysRevB.79.024514 · Physical Review B
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Abstract
The momentum and temperature dependence of the superconducting gap and pseudogap in optimally doped Bi2Sr1.6La0.4CuO6 superconductor is investigated by superhigh-resolution laser-based angle-resolved photoemission spectroscopy. The measured energy gap in the superconducting state exhibits a standard d-wave form. Pseudogap opens above Tc over a large portion of the Fermi surface with a “Fermi arc” formed near the nodal region. In the region outside of the “Fermi arc,” the pseudogap has the similar magnitude and momentum dependence as the gap in the superconducting state, which changes little with temperature and shows no abrupt change across Tc. These observations indicate that the pseudogap and superconducting gap are closely related and favor the picture that the pseudogap is a precursor to the superconducting gap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr1.6La0.4CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
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