Rapid change of superconductivity and electron-phonon coupling through critical doping in Bi-2212.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 30287656.
- Also identified by DOI 10.1126/science.aar3394.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Electron-boson coupling plays a key role in superconductivity for many systems. However, in copper-based high-critical temperature (<i>T</i> <sub>c</sub>) 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<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+δ</sub> 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-<i>T</i> <sub>c</sub> 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.