Central peak in the pseudogap of high T_c superconductors

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dc.creatorSunko, D. K.
dc.creatorBarisic, S.
dc.date2004-07-30
dc.date2005-06-12
dc.date.accessioned2026-07-07T02:59:31Z
dc.date.available2026-07-07T02:59:31Z
dc.descriptionWe 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.
dc.descriptionFinal version as accepted in EPJ B, 13 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0407800
dc.identifierhttp://arxiv.org/abs/cond-mat/0407800
dc.identifierEur. Phys. J. B 46, 269-279 (2005)
dc.identifierdoi:10.1140/epjb/e2005-00244-x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/24537
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleCentral peak in the pseudogap of high T_c superconductors
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