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Title: Spin singlet and quasiparticle excitations in cuprate superconductors

Journal Article · · Physical Review. B

We followed step by step the transition from an antiferromagnetic (AFM) Mott insulator to a superconducting (SC) metal in the Bi2Sr2CaCu2O8 + δ (Bi-2212) cuprate using electronic Raman scattering spectroscopy. This was achieved by tracking the doping dependence of the spin singlet excitation (SSE) originating from the AFM Mott insulator, the normal-state quasiparticle excitation related to the mobile charge carriers, and the Bogoliubov quasiparticles related to the SC gap. We show that the signature of the pseudogap phase which develops during this transition can be interpreted as the blocking of charge carriers by the enhancement of the AFM correlations as the temperature drops. We find that the energy scale of the pseudogap, Δpg(p), closely follows that of the SSE, Δsse(p) with doping p. The quasiparticle lifetime considerably increases with doping when the pseudogap collapses. We reveal that the maximum amplitude of the SC gap Δ$$^{ma}_{sc}$$ and the SC transition temperature Tc are linked in an extended range of doping, such as Δ$$^{ma}_{sc}$$(p)∝Δsse(p)Tc(p). This relation suggests that the AFM correlations play a key role in the mechanism of superconductivity.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); French National Research Agency (ANR)
Grant/Contract Number:
SC0012704; ANR19-CE30-0019-01
OSTI ID:
1971483
Report Number(s):
BNL-224253-2023-JAAM; TRN: US2313573
Journal Information:
Physical Review. B, Vol. 106, Issue 17; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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