Details

Autor(en) / Beteiligte

• 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

Titel

Rapid change of superconductivity and electron-phonon coupling through critical doping in Bi-2212

Ist Teil von

• Science (American Association for the Advancement of Science), 2018-10, Vol.362 (6410), p.62-65

Ort / Verlag

United States: The American Association for the Advancement of Science

Erscheinungsjahr

2018

Quelle

American Association for the Advancement of Science

Beschreibungen/Notizen

• 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.