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

Abstract

Electron-boson coupling plays a key role in superconductivity for many systems. However, in copper-based high–critical temperature (Tc) 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+δ. 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 (EPC) reinforce each other in a positive-feedback loop upon entering the strange-metal regime, which in turn drives a stronger superconductivity.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1476136
Alternate Identifier(s):
OSTI ID: 1484424; OSTI ID: 1571110
Grant/Contract Number:  
AC02-76SF00515; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 362 Journal Issue: 6410; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

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., and Shen, Z. -X. Rapid change of superconductivity and electron-phonon coupling through critical doping in Bi-2212. United States: N. p., 2018. Web. doi:10.1126/science.aar3394.
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. Rapid change of superconductivity and electron-phonon coupling through critical doping in Bi-2212. United States. doi:https://doi.org/10.1126/science.aar3394
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., and Shen, Z. -X. Thu . "Rapid change of superconductivity and electron-phonon coupling through critical doping in Bi-2212". United States. doi:https://doi.org/10.1126/science.aar3394.
@article{osti_1476136,
title = {Rapid change of superconductivity and electron-phonon coupling through critical doping in Bi-2212},
author = {He, Y. and Hashimoto, M. and Song, D. and Chen, S. -D. and He, J. and Vishik, I. M. and Moritz, B. and Lee, D. -H. and Nagaosa, N. and Zaanen, J. and Devereaux, T. P. and Yoshida, Y. and Eisaki, H. and Lu, D. H. and Shen, Z. -X.},
abstractNote = {Electron-boson coupling plays a key role in superconductivity for many systems. However, in copper-based high–critical temperature (Tc) 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+δ. 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 (EPC) reinforce each other in a positive-feedback loop upon entering the strange-metal regime, which in turn drives a stronger superconductivity.},
doi = {10.1126/science.aar3394},
journal = {Science},
number = 6410,
volume = 362,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1126/science.aar3394

Citation Metrics:
Cited by: 8 works
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Figures / Tables:

Fig. 1 Fig. 1: Superconductivity rapidly deviates from the weakly coupled $d$-wave BCS limit with 5 underdoping. (A) The schematic phase diagram for Bi-2212 reproduced from ref (22), with an emphasis on the doping range of interest (boxed in red). The blue squares are the antinodal gap opening temperature T*, and themore » red squares are the superconducting transition temperature Tc (Fig. S1). PG - pseudogap, SC - superconductivity, SM – strange metal, FL - Fermi liquid. (B) The FD-EDCs taken at the antinodal kF for a series of doping. Red curves refer to T ~ T*for $ρ$ < 0.22 10 and T > Tc for $ρ$ > 0.22, and blue curves refer to T << Tc for all dopings. The black circles denote the superconducting quasiparticle peak position. The inset schematically illustrates the momenta of the listed spectra. (C) The antinodal gap $Δ$AN (solid circle) and the nodal gap$Δ$N (open circle) (22) plotted against the sample Tc. The two dashed lines mark the gap-to-Tc ratios of 4.3 (the weakly coupled $d$-wave BCS value) and 10. (D) The gap-to-Tc ratio shows a rapid deviation from 4.3 (horizontal black dashed line) at $ρ$ < 0.22.« less

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