Evolution of the gaps through the cuprate phase-diagram

Abstract

The actual physical origin of the gap at the antinodes, and a clear identification of the superconducting gap are fundamental open issues in the physics of high-$T_c$ superconductors. Here, we present a systematic electronic Raman scattering study of a mercury-based single layer cuprate, as a function of both doping level and temperature. On the deeply overdoped side, we show that the antinodal gap is a true superconducting gap. In contrast, on the underdoped side, our results reveal the existence of a break point close to optimal doping below which the antinodal gap is gradually disconnected from superconductivity. The nature of both the superconducting and normal state is distinctly different on each side of this breakpoint.

References in corpus (7)

• Scanning tunneling spectroscopy of high-temperature superconductors
• Inelastic Light Scattering From Correlated Electrons
• Distinct Fermi-Momentum Dependent Energy Gaps in Deeply Underdoped Bi2212
• Two Energy Scales and two Quasiparticle Dynamics in the Superconducting State of Underdoped Cuprates
• Evidence for complex order parameter in La_{1.83}Sr_{0.17}CuO_4
• Phenomenological description of the two energy scales in underdoped superconducting cuprates
• The superconducting gap in the Hubbard model and the two gap energy scales in high-Tc cuprates

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• Evidence for competition between the superconducting and the pseudogap state in (BiPb)_2(SrLa)_2CuO_{6+δ} from muon-spin rotation experiments
• Pseudogap Behavior Revealed in Interlayer Tunneling in Overdoped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$
• Sum-rules for Raman scattering off strongly correlated electron systems
• Energy Scales in the Raman spectrum of electrons and hole doped cuprates within competing scenarios
• Energy gaps in high-$T_c$ superconductors: BCS after all?