期刊
SCIENCE
卷 362, 期 6410, 页码 62-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aar3394
关键词
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资金
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- DOE, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-05CH11231]
Electron-boson coupling plays a key role in superconductivity for many systems. However, in copper-based high-critical temperature (T-c) superconductors, its relation to superconductivity remains controversial despite strong spectroscopic fingerprints. In this study, we used angle-resolved photoemission spectroscopy to find a pronounced correlation between the superconducting gap and the bosonic coupling strength near the Brillouin zone boundary in Bi2Sr2CaCu2O8+8 . The bosonic coupling strength rapidly increases from the overdoped Fermi liquid regime to the optimally doped strange metal, concomitant with the quadrupled superconducting gap and the doubled gap-to-T-c ratio across the pseudogap boundary. This synchronized lattice and electronic response suggests that the effects of electronic interaction and the electron-phonon coupling (EPC) reinforce each other in a positive-feedback loop upon entering the strange-metal regime, which in turn drives a stronger superconductivity.
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