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He, Y; Hashimoto, M; Song, D; Chen, S-D; He, J; Vishik, I M; Moritz, B; Lee, D-H; Nagaosa, N; Zaanen, J; Devereaux, T P; Yoshida, Y; Eisaki, H; Lu, D H; Shen, Z-X
Science (American Association for the Advancement of Science), 10/2018, Volume: 362, Issue: 6410Journal Article
Electron-boson coupling plays a key role in superconductivity for many systems. However, in copper-based high-critical temperature ( ) 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 Bi Sr CaCu O 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- 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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