Disappearance of Superconductivity Due to Vanishing Coupling in the Overdoped Bi₂Sr₂CaCu₂O_8+δ

Journal Article · 28 January 2020 · Nature Communications

DOI: https://doi.org/10.1038/s41467-020-14282-4 · OSTI ID:1581514

Valla, Tonica  ^[1]; Drozdov, I. K. ^[1]; Gu, G. D. ^[1]

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1. Brookhaven National Lab. (BNL), Upton, NY (United States)

In cuprate superconductors, superconductivity is accompanied by a ‘plethora of orders’, and phenomena that complicate our understanding of superconductivity in these materials. Prominent in the underdoped regime, these orders weaken or vanish with overdoping. Here, we approach the superconducting phase from the more conventional overdoped side. We present angle-resolve photoemission spectroscopy studies of Bi₂Sr₂CaCu₂O_8+δ, cleaved and annealed in ozone to increase the doping all the way to the non-superconducting phase. In this work, we show that the mass renormalizationin the antinodal region of the Fermi surface, associated with the structure in the quasiparticle self-energy, that possibly reflects the pairing, weakens with doping and completely disappears precisely where superconductivity disappears the evidence that in the overdoped regime, superconductivity is determined by the coupling strength. A doping dependence and an abrupt disappearance above the transition temperature eliminate phononic mechanism of the observed renormalization and identify the onset of spin-fluctuations as its likely origin.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• Grant/Contract Number: SC0012704
• OSTI ID: 1581514
• Report Number(s): BNL--212477-2019-JAAM
• Journal Information: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 11; ISSN 2041-1723
• Publisher: Nature Publishing GroupCopyright Statement
• Country of Publication: United States
• Language: English