Central peak in the pseudogap of high T_c superconductors

Abstract

We study the effect of antiferromagnetic (AF) correlations in the three-band Emery model, with respect to the experimental situation in weakly underdoped and optimally doped BSCCO. In the vicinity of the vH singularity of the conduction band there appears a central peak in the middle of a pseudogap, which is in an antiadiabatic regime, insensitive to the time scale of the mechanism responsible for the pseudogap. We find a quantum low-temperature regime corresponding to experiment, in which the pseudogap is created by zero-point motion of the magnons, as opposed to the usual semiclassical derivation, where it is due to a divergence of the magnon occupation number. Detailed analysis of the spectral functions along the (pi,0)-(pi,pi) line show significant agreement with experiment, both qualitative and, in the principal scales, quantitative. The observed slight approaching-then-receding of both the wide and narrow peaks with respect to the Fermi energy is also reproduced. We conclude that optimally doped BSCCO has a well-developed pseudogap of the order of 1000 K. This is only masked by the narrow antiadiabatic peak, which provides a small energy scale, unrelated to the AF scale, and primarily controlled by the position of the chemical potential.

arXiv commentFinal version as accepted in EPJ B, 13 pages, 8 figures

References in corpus (29)

• Evidence for ubiquitous strong electron-phonon coupling in high-temperature superconductors
• How to detect fluctuating order in the high-temperature superconductors
• LDA energy bands, low-energy Hamiltonians, t', t'', t_{perp}(k), and J_{perp}
• Renormalization of spectral lineshape and dispersion below Tc in Bi2Sr2CaCu2O8+d
• Non-perturbative many-body approach to the Hubbard model and single-particle pseudogap
• Electronic Spectra and Their Relation to the (pi,pi) Collective Mode in High-Tc Superconductors
• Phenomenological Models for the Gap Anisotropy of Bi-2212 as Measured by ARPES
• Bilayer Splitting in the Electronic Structure of Heavily Overdoped Bi2Sr2CaCu2O8+d
• Temperature Dependent Scattering Rates at the Fermi Surface of Optimally Doped Bi 2212
• BCS-like Bogoliubov Quasiparticles in High-Tc Superconductors Observed by Angle-Resolved Photoemission Spectroscopy
• Superconducting Gap and Strong In-Plane Anisotropy in Untwinned YBa2Cu3O7-d
• Pseudogap in High - Temperature Superconductors
• Doubling of the bands in overdoped Bi2Sr2CaCu2O8-probable evidence for c-axis bilayer coupling
• Origin of the peak-dip-hump structure in the photoemission spectra of Bi2212
• Theories of non-Fermi liquid behavior in heavy fermions
• Effect of the magnetic resonance on the electronic spectra of high Tc superconductors
• The Fermi surface of Bi2Sr2CaCu2O8
• On the determination of the Fermi surface in high-Tc superconductors by angle-resolved photoemission spectroscopy
• Vorticity and the Nernst Effect in Cuprate Superconductors
• Shadow features and shadow bands in the paramagnetic state of cuprate superconductors
• Raman scattering through a metal-insulator transition
• Slave-Boson Three-Band Model with O-O Hopping for High-Tc Superconductors
• On the nature of antiferromagnetism in the CO_2 planes of oxide superconductors
• The effect of large $U_d$ on the Raman spectrum in the copper-oxide superconductors
• Pseudogap and Superconducting Fluctuation in High-Tc Cuprates: Theory beyond 1-loop Approximation
• Pseudogap behavior of nuclear spin relaxation in high Tc superconductors in terms of phase separation
• Luttinger Sum Rule in Slave-Particle Theories
• Fermion kinetics in the Falicov-Kimball limit of the three-band Emery model
• Probing the Phase Diagram of Bi2Sr2CaCu2O8+d with Tunneling Spectroscopy

Cited by in corpus (5)

• Pseudogaps in Strongly Correlated Metals: A generalized dynamical mean-field theory approach
• Temperature range of superconducting fluctuations above T_c in YBa_2Cu_3O_{7-δ} single crystals
• Electronic Raman scattering in a multiband model for cuprate superconductors
• The electronic pseudogap in optimally doped NCCO
• Destabilization of the Zhang-Rice singlet at optimal doping