Rapid change of superconductivity and electron-phonon coupling through 19% doping in Bi2212

Electron-boson coupling plays a key role in superconductivity for many systems. However, in copper-based high-temperature (\(T_c\)) superconductors, its relation to superconductivity remains controversial despite strong spectroscopic fingerprints. Here we use angle-resolved photoemission spectroscop...

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Bibliographic Details
Published in:arXiv.org 2018-09
Main Authors: He, Yu, Hashimoto, Makoto, Song, Dongjoon, Chen, Sudi, He, Junfeng, Vishik, Inna M, Moritz, Brian, Lee, Dunghai, Nagaosa, Naoto, Zaanen, Jan, Devereaux, Thomas P, Yoshida, Yoshiyuki, Eisaki, Hiroshi, Lu, Donghui, Shen, Zhi-Xun
Format: Article
Language:English
Subjects:
Brillouin zones
Coupling
Electrons
High temperature
Phonons
Photoelectric emission
Superconductivity
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Summary:Electron-boson coupling plays a key role in superconductivity for many systems. However, in copper-based high-temperature (\(T_c\)) superconductors, its relation to superconductivity remains controversial despite strong spectroscopic fingerprints. Here we use angle-resolved photoemission spectroscopy to find a striking correlation between the superconducting gap and the bosonic coupling strength near the Brillouin zone boundary in Bi\(_2\)Sr\(_2\)CaCu\(_2\)O\(_{8+\delta}\). 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-Tc ratio across the pseudogap boundary. This synchronized lattice and electronic response suggests that the effects of electronic interaction and the electron-phonon coupling become intimately entangled upon entering the strange metal regime, which may in turn drive a stronger superconductivity.
ISSN:2331-8422
DOI:10.48550/arxiv.1809.07437